Apr 152014
 

Original story by  Jake Sturmer, ABC News

Researchers in New South Wales have begun a trial to search for the "Achilles heel" of carp.
Carp Etch. Image: DAFF Qld

Carp Etch. Image: DAFF Qld

The introduced species is considered to be one of the world's most invasive and scientists say they are Australia's worst aquatic pest.

The project will tag and track carp in the upper Murrumbidgee River, which have played a part in the significant decline of native fish.

Scientists estimate 90 per cent of all native fish have been lost in the river since European settlement.

University of Canberra Associate Professor Mark Lintermans says the fish have had a significant impact on the waterways.

"[They compete] for food, they carry parasites that then spread on to native fish," he said.

"There's even a suggestion that they might be hoovering up eggs of native fish as they feed along the bottom."

The research is being done with the New South Wales Department of Primary Industries and Bush Heritage Australia in its Scottsdale Reserve.

"This project is initially about gathering information - there's a gap of knowledge of the carp in the upper reaches of the Murrumbidgee," reserve manager Peter Saunders said.

"So we're looking to understand what they're doing, where they're aggregating, what their populations are and how they're breeding and where they're breeding.

"Then [we plan to] expand that project into actually starting to remove them to benefit the native fish which we know are in here in small numbers."

Local angler and member of the Capital Region Fishing Alliance, Steve Samuels, says a lot has changed since he began fishing in the river in the 1970s.

"There was Murray Cod, Golden Perch, Silver Perch - it was a wonderful place to fish," he said.

"But today as you see it, the water's a lot dirtier and carp now dominate as the most prolific fish in the system."

Contact Investigations@abc.net.au

Apr 152014
 

Media release by Tom Rickey, Pacific Northwest National Laboratory

Fish-friendly hydropower is the goal of international team
Zhiqun (Daniel) Deng (l) and Rich Brown in the Three Gorges Dam in China.

Zhiqun (Daniel) Deng (l) and Rich Brown in the Three Gorges Dam in China.

Think of the pressure change you feel when an elevator zips you up multiple floors in a tall building. Imagine how you'd feel if that elevator carried you all the way up to the top of Mt. Everest — in the blink of an eye.

That's similar to what many fish experience when they travel through the turbulent waters near a dam. For some, the change in pressure is simply too big, too fast, and they die or are seriously injured.

In an article in the March issue of the journal Fisheries, ecologists from the Department of Energy's Pacific Northwest National Laboratory and colleagues from around the world explore ways to protect fish from the phenomenon, known as barotrauma.

Among the findings: Modifying turbines to minimize dramatic shifts in pressure offers an important way to keep fish safe when passing through dams. The research is part of a promising body of work that aims to reduce such injuries by improving turbine designs in dams around the world.

PNNL researchers are working with officials and scientists from Laos, Brazil, and Australia — areas where hydropower is booming — to apply lessons learned from experience in the Pacific Northwest, where salmon is king and water provides about two-thirds of the region's power. There, billions of dollars have been spent since 1950 to save salmon endangered largely by the environmental impact of hydropower.

Colorized photo of the swim bladder of a smallmouth bass.

Colorized photo of the swim bladder of a smallmouth bass.

"Hydropower is a tremendous resource, often available in areas far from other sources of power, and critical to the future of many people around the globe," said Richard Brown, a senior research scientist at PNNL and the lead author of the Fisheries paper.

"We want to help minimize the risk to fish while making it possible to bring power to schools, hospitals, and areas that desperately need it," added Brown.

Harnessing the power of water flowing downhill to spin turbines is the most convenient energy source in many parts of the world, and it's a clean, renewable source of energy to boot.

In Brazil, several dozen dams are planned along the Amazon, Madeira and Xingu rivers — an area that teems with more than 5,000 species of fish, and where some of the largest hydropower projects in the world are being built. In southeastern Australia, hydropower devices are planned in the area drained by the Murray-Darling river system. And in Southeast Asia, hundreds of dams and smaller hydro structures are planned in the Lower Mekong River Basin.

The authors say the findings from a collaboration that spans four continents improve our understanding of hydropower and will benefit fish around the globe. New results about species in the Mekong or Amazon regions, for instance, can inform fish-friendly practices in those regions of the United States where barotrauma has not been extensively studied.

To 'Everest' and back in an instant

Dams vary considerably in the challenges they pose to migrating fish, and the challenges are magnified when a fish must pass through more than one dam or hydro structure. At some, mortality is quite high, while at others, such as along the Columbia River, most fish are able to pass over or through a single dam safely, thanks to extensive measures to keep fish safe. Some fish spill harmlessly over the top, while others pass through pipes or other structures designed to route fish around the dam or steer them clear of the energy-producing turbines.

Researcher John Stephenson observes young salmon in a chamber used to simulate the conditions that fish sometimes experience as they travel through a dam.

Researcher John Stephenson observes young salmon in a chamber used to simulate the conditions that fish sometimes experience as they travel through a dam.

Still, at most dams, the tremendous turbulence of the water can hurt or disorient fish, and the blades of a turbine can strike them. The new study focuses on a third problem, barotrauma — damage that happens at some dams when a fish experiences a large change in pressure.

Depending on its specific path, a fish traveling through a dam can experience an enormous drop in pressure, similar to the change from sea level to the top of Mt. Everest, in an instant. Just as fast, as the waters swirl, the fish suddenly finds itself back at its normal pressure.

Those sudden changes can have a catastrophic effect on fish, most of which are equipped with an organ known as a swim bladder — like a balloon — to maintain buoyancy at a desired depth. When the fish goes deeper and pressures are greater, the swim bladder shrinks; when the fish rises and pressure is reduced, the organ increases in size.

For some fish, the pressure shift means the swim bladder instantly expands four-fold or eight-fold, like an air bag that inflates suddenly. This rapid expansion can result in internal injuries or even death.

Factors at play include the specific path of a fish, the amount of water going through a turbine, the design of the turbine, the depth of water where the fish usually lives, and the physiology of the fish itself.

"To customize a power plant that is the safest for the fish, you must understand the species of fish in that particular river, their physiology, and the depth at which they normally reside, as well as the tremendous forces that the fish can be subjected to," said Brown.

PNNL scientists have found that trying to keep minimum pressure higher in all areas near the turbine is key for preventing barotrauma. That reduces the amount of pressure change a fish is exposed to and is a crucial component for any turbine that is truly "fish friendly." Preventing those extremely low pressures also protects a turbine from damage, reducing shutdowns and costly repairs.

Chinook salmon

Chinook salmon

Lower Mekong River Basin

Brown and PNNL colleague Zhiqun (Daniel) Deng have made several trips to work with scientists in Southeast Asia, where dozens of dams are planned along the Mekong River and its tributaries. The Mekong starts out high in Tibet and travels more than 2,700 miles, touching China, Myanmar, Laos, Thailand, Cambodia, and Vietnam. The team estimates more than 1,200 species of fish make their home in the Mekong, including the giant Mekong catfish and the giant freshwater stingray, as well as the endangered Irrawaddy dolphin.

The scientists estimate that the region's fish account for almost half of the protein in the diet of the people of Laos and nearly 80 percent for the people of Cambodia. Four out of five households in the region rely heavily on fish for food, jobs, or both.

"Many people in Southeast Asia rely on fish both for food and their livelihood; it's a huge issue, crucial in the lives of many people. Hydropower is also a critical resource in the region," said Deng, a PNNL chief scientist and an author of the paper.

"Can we reduce the impact of dams on fish, to create a sustainable hydropower system and ensure the food supply and livelihoods of people in these regions? Can others learn from our experiences in the Pacific Northwest? This is why we do research in the laboratory — to make an impact in the real world, on people's lives," added Deng.

The same team of scientists just published a paper in the Journal of Renewable and Sustainable Energy, focusing broadly on creating sustainable hydro in the Lower Mekong River Basin. The paper discusses the potential for hydropower sources in the region (30 gigawatts), migratory patterns of its fish, the importance of fish-friendly technology, and further studies needed to understand hydro's impact on fish of the Mekong.

Authors of the Fisheries paper include scientists from PNNL, the National University of Laos, and the Living Aquatic Resources Research Center in Laos, the Federal University of São João Del-Rei in Brazil, the University of British Columbia; and from Australia, the Port Stephens Fisheries Institute in New South Wales, the Narrandera Fisheries Centre in New South Wales, and Fishway Consulting Services. PNNL's work in the area has been funded by the U.S. Army Corps of Engineers, DOE's Office of Energy Efficiency and Renewable Energy, and AusAid, the Australian Agency for International Development.


Reference: Richard S. Brown, Alison H. Colotelo, Brett D. Pflugrath, Craig A. Boys, Lee J. Baumgartner, Z. Daniel Deng, Luiz G.M. Silva, Colin J. Brauner, Martin Mallen-Cooper, Oudom Phonekhampeng, Garry Thorncraft, Douangkham Singhanouvong, Understanding barotrauma in fish passing hydro structures: a global strategy for sustainable development of water resources,Fisheries, March 2014, DOI:10.1080/03632415.2014.883570.

Apr 152014
 

Original story by Michael Cavanagh, ABC Rural

They could be described as the canaries of the estuaries.

Oysters used to detect contaminants. Researchers using Sydney Rock oysters show the health of NSW waterways varies dramatically.

Oysters used to detect contaminants. Researchers using Sydney Rock oysters show the health of NSW waterways varies dramatically.

Sydney rock oysters - which are not part of commercial operations but selected by researchers - are being used to chart the state of waterways from the Hunter Valley through to the New South Wales/Victorian border.

Results varied from high levels of metals in waters around Wollongong through to a pristine environment around the Clyde River near Bateman's Bay, on the south coast.

Professor Emma Johnston, from the University of New South Wales, says oysters were 'significantly stressed' with damaged cells in the estuaries where there were high levels of metals including copper, lead and zinc.

"These oysters are exposed to all the conditions in the water, just as the canaries were exposed to those in air.

"So if something goes wrong we know that there is a problem in the system, so our oysters are filter feeders.

"So they can filter loads of water every day and if there is a containment in the water, they'll be exposed to that and they will respond."

Apr 152014
 

published by the Department of Environment

Wetlands Australia: National Wetlands Update February 2014

Wetlands Australia: National Wetlands Update February 2014

Download

Introduction

The international theme of World Wetlands Day 2014 is “Wetlands and Agriculture: Partners for Growth”. For millennia, wetlands have been used directly for agriculture, and for supplying food, fuel and fibre to support lives and livelihoods. Wetlands continue to play an essential role in supporting modern day agriculture. They provide water storage, flood buffering, nutrient removal, water purification and erosion control. Sustainable practices which support both agriculture and healthy wetlands are therefore coming to the fore.

This edition of Wetlands Australia includes several feature articles on wetlands and agriculture, along with many other articles on current wetland projects and programs.

Australia was one of the first countries to sign the Convention on Wetlands of International Importance (more commonly known as the Ramsar Convention), and in 1974 designated the world's first Ramsar site: Cobourg Peninsula in the Northern Territory.  In celebration of the 40th anniversary of the first Ramsar designation, this edition of Wetlands Australia also features 23 articles celebrating Australian Ramsar sites.

If you would like to contribute to future editions of Wetlands Australia, please contactwetlandsmail@environment.gov.au

Download individual chapters

Introduction and contents (PDF - 698.64 KB)

Wetlands and Agriculture: Partners for Growth (PDF - 888.7 KB)

  • Wimmera wetland project benefits whole farm
  • Murray Wetland Carbon Storage project
  • Territory Conservation Agreements – helping pastoralists look after wetlands
  • Agricultural water supports wetlands and tourism
  • I’d like to order some bitterns and rice, please
  • Burdekin cane farmer builds a wetland for the future

Ramsar wetland management in Australia (PDF - 749.5 KB)

  • Ramsar in New South Wales – a tale of 12 sites
  • Queensland wetlands celebrate 20 years of Ramsar listing
  • Banrock Station wetland and vineyard - a perfect blend
  • Record breaking flight signals the importance of conserving wetlands
  • Environmental flows bring waterbirds to Tuckerbil Swamp Ramsar site
  • Managing weed and sea level rise threats to Kakadu’s tropical river floodplains

Wetland conservation and restoration (PDF - 807.27 KB)

  • An update on wetland restoration on private land in South Australia and Victoria
  • Protecting and enhancing the wonderful Moolort Wetlands of Victoria
  • Using historical mine pits in Western Australia to create a wetlands complex for the benefit of water bird conservation and the local community
  • Doing it together – a good news story about the fairies and the ferry
  • From little things, big things grow
  • Successful rehabilitation of a Waterbird Refuge
  • Kids tell companies to mind their business
  • Students and surf club - the clean-up team!

Water management and wetlands (PDF - 828.02 KB)

  • Environmental watering in the Lower Lachlan River catchment, New South Wales
  • To wade or not to wade - hydrological management effects on species composition
  • Partnering to restore the Mallowa Creek floodplain wetlands

Wetland management and research (PDF - 706.58 KB)

  • Queensland Indigenous Land and Sea Ranger Program
  • The Finke River- salty & lovin’ it
  • Novel ecosystem, novel approaches
  • Sixth Lake Eyre Basin Conference – cross-border collaboration

Celebrating the 40th anniversary of the Ramsar Convention in Australia – a showcase of Australian Ramsar sites (PDF - 2.94 MB)

  • Cobourg Peninsula Ramsar Site, Northern Territory
  • Kakadu National Park Ramsar Site, Northern Territory
  • Barmah Forest Ramsar Site, Victoria
  • Flood Plain Lower Ringarooma River Ramsar Site, Tasmania
  • Gippsland Lakes Ramsar Site, Victoria
  • Logan Lagoon Ramsar Site, Tasmania
  • Moulting Lagoon Ramsar Site, Tasmania
  • Port Phillip Bay (Western Shoreline) and Bellarine Peninsula Ramsar Site, Victoria
  • Hunter Estuary Wetlands Ramsar Site, New South Wales
  • Towra Point Ramsar Site, New South Wales
  • The Coorong and Lakes Alexandrina and Albert Ramsar Site, South Australia
  • Macquarie Marshes Ramsar Site, New South Wales
  • Coongie Lakes Ramsar Site, South Australia
  • Eighty-mile Beach Ramsar Site, Western Australia
  • Lake Toolibin Ramsar Site, Western Australia
  • Peel-Yalgorup System Ramsar Site, Western Australia
  • Blue Lake Ramsar Site, New South Wales
  • Ginini Flats Wetland Complex Ramsar Site, Australian Capital Territory
  • Great Sandy Strait Ramsar Site, Queensland
  • Banrock Station Wetland Complex Ramsar Site, South Australia
  • Elizabeth and Middleton Reefs Ramsar Site, Coral Sea Islands Territory
  • The Dales Ramsar Site, Christmas Island
  • Piccaninnie Ponds Karst Wetlands Ramsar Site, South Australia

Calendar of events (PDF - 482.54 KB)

Previous editions of Wetlands Australia are also available:

Apr 132014
 

Original story by , Sydney Morning Herald

High concentrations of metals in Port Jackson, Port Kembla and Botany Bay are having a major impact on marine life, researchers have found.
Shell shock: Professor Emma Johnston and Dr Katelyn Edge. Photo: Brendan Esposito

Shell shock: Professor Emma Johnston and Dr Katelyn Edge. Photo: Brendan Esposito

Toxic levels of copper, zinc and lead from stormwater or due to past industrial dumping are making Sydney rock oysters infertile, University of NSW scientists say.

''We know there are contaminants in the sediments in some estuaries in NSW but we didn't know what impact they were having on the marine life living in the water until now,'' research supervisor Emma Johnston said.

Contaminated oysters found near Five Dock. Photo: Brendan Esposito

Contaminated oysters found near Five Dock. Photo: Brendan Esposito

The study of 10 NSW estuaries, the first of its kind to measure the effect of toxins on marine animals rather than just measure the level of contaminants in the water or sediment, suggests the pollutants might also be harming other species.

''There are hot spots of contamination throughout estuaries in NSW and we need to find ways to ameliorate that problem because it is causing ongoing ecological damage,'' Professor Johnston said.

Although oysters were a hardy species and could survive in heavily polluted areas, they accumulated contaminants such as metals in their tissues, which made them an ideal ''bio-monitor'' to assess the overall health of a waterway, she said.

As part of the study, marine ecotoxicologist Katelyn Edge deployed bags of oysters at 58 sites in 10 estuaries along the coast.

After three months Dr Edge, who conducted the research as part of her PhD, measured the level of contaminants in the sediment on the estuary floor, in the water column and in the tissue of the oysters.

''Where the concentration of contaminant was high in both the sediment and oysters' tissue we found really high stress levels in the oysters,'' said Dr Edge, who published her findings in the journal Chemosphere.

The most heavily contaminated estuaries were Port Jackson, Port Kembla, Botany Bay and the Hunter River in Newcastle, she said.

The Clyde, Port Hacking, Broken Bay, Karuah River and the Wagonga Inlet were the cleanest waterways.

Professor Johnston said the findings were a counter to arguments against remediating contaminated sites because their results showed metals in the sediments were causing problems for animals living above the estuary floor.

'''Just leave it there, it'll be fine' is an argument we have heard.''

In waterways such as Sydney Harbour, ferries and boats were constantly stirring sediments and dragging contaminants into the water column, she said.

''There are some locations in Sydney Harbour that are some of the most contaminated in the world and rarely is anything done about it,'' Professor Johnston said.

In laboratory studies Dr Edge found high levels of metals inside the oysters' tissues would rupture structures inside their cells, affecting the ability to reproduce.

Sydney rock oysters, a native species found along the coast from Queensland to Tasmania and South Australia, should be used as a biomarker during future developments or dredging to assess the impact on marine ecosystems.

Apr 122014
 
The following article from Practical Fishkeeping gives a UK perspective about the hobby, but all of the issues discussed are relevant to fishkeeping hobbyists here in Australia.

Original story by Nathan Hill at Practical Fishkeeping

A handful of recent events have prompted Nathan Hill to put finger to keyboard and share some of his biggest fears of what could put an end to the hobby we all love...
Photo: Practical fishkeeping

Photo: Practical fishkeeping

Something I’ve long admired about this hobby is its tenacity. It has, over the years, been subject to all sorts of accusations, including being geeky or uncool, being unnecessarily expensive (early marine keepers, anyone?) and even being environmentally unsound.

Despite this the hobby and the supporting trade prevails, and even in the face of some fluctuating trends: not least of all that same, damning migration to online purchasing that can wither and drain bricks-and-mortar premises. More than just prevailing, in some cases it actively stands proud, is able to boast expansion, recruitment, and economic growth. Even during this ongoing global economic wobble, fishkeeping is burgeoning. Wow.

That’s not to say that we are not vulnerable, susceptible even, to factors that could pull the metaphoric rug from under our feet.

I’m often engaged in conversation with people across a breadth of different fields: anglers, wholesalers, retailers, hobbyists, environmental scientists, and so on. Talking across such a diverse spectrum, I pick up on a lot of different concerns that reside, often unwittingly so, at the backs of peoples’ minds. After sitting and brooding on these for way too long, I'd like to share my biggest fears of what could, at any time, befall our hobby and end fishkeeping.

Disease

Pathogens capable of inciting disease pandemics are a major global worry. Just look at human concerns about antibiotic abuse and the occurrence of MRSA. Look at recent worries about Ebola outbreaks. Even look at the return of diseases that could easily be prevented in humans, were people not so blinkered and scientifically ill informed about vaccines. Disease pandemics are a major fear.

If you’re a newcomer to the hobby, then whatever you think you know about fish farming – forget it. If you have images of clinical facilities where each and every fish is treated like a newborn infant, then it’s back to the drawing board time. Farms are businesses, plain and simple. The goal is to get young fish out of adults as eggs, to hatch them, and to get them up to saleable juveniles as soon as possible, and that means that pretty much anything is on the cards to get them there. Antibiotics are used where necessary (and maybe even where not), and not just the kinds of antibiotics that you or I might have access to via a vet. Different countries have different laws about what can and can’t be used, and in some it’s a bit of a medicine free for all.

Hopefully we all know the dangers of antibiotic abuse, but in case anyone is unsure, here’s a brief recap:

Antibiotics kill things indiscriminately (the very word 'antibiotic' literally translates as ‘against life’). The idea is that they kill bacteria at a lower dose rate than which they kill the host. So if a fish gets ill, you can poison everything in the tank with antibiotics, and the pathogens making the fish ill should die before the fish does, and then you can stop the antibiotics.

However, if you leave a few bacteria behind, they start to get immune, and can build tolerance to the antibiotic. So, the next outbreak of bacteria will be a bit 'harder' to control than the first lot. Repeat the process, leave a few bacteria behind, and they get harder to kill again, until eventually you end up with pathogens that are so resistant to antibiotics that you’d need to use a dose rate so high that you’d kill the host before the pathogen.

That’s the abridged version, anyway.

The problem of course is that unregulated use of antibiotics over in the farming nations could quite feasibly create a strain of bacteria that our own antibiotics have no effect against. With diseased fish coming in, and no ability to cure them, we wouldn’t stand a chance.

But it’s not just bacteria.

There are a few pathogens on the horizon that are cause for concern at this time. In coldwater fish, there are the dreaded illnesses of KHV (Koi herpes virus) and SVC (Spring viraemia of Carp), both of which have the potential to cause massive problems to Cyprinids. Not so long ago, massive wipeouts from the former blighted farms across the world, causing losses on unmentionable scales in both ornamental and food fish culture. Here in the UK, some retailers faced the furious backlash from introducing the disease to consumer’s ponds. One was even driven to bankruptcy over it.

In the tropical world, I am very twitchy about Tetrahymena pyriformis, otherwise known as Guppy disease (though this is unfair as many fish are susceptible). This disease can cause massive mortality at breakneck speeds, especially in farm, wholesale and retail environments. I’m not the only one worried about this particular pathogen, either.

What is so very infuriating is the ‘wait and see’ attitude of some traders. This is not a disease to ignore, and to do so is not just at your own peril, but that of the entire industry.

Running costs

You will recall recently that Jack Heathcote had to close down his massive aquarium because of exorbitant running costs. Agreed, his tank was huge: an absolute electricity guzzling swimming pool of a thing. But the point is, it used to be well within his outgoings to operate. Prices are creeping, across the board, and more and more of us are noticing.

Compulsory water metering, if introduced across the UK, will spell death for many users of RO water. Given that tapwater isn’t going to get better any time soon, marine keepers in particular will have the choice of either paying out for a safe supply, reverting the hardiest, nitrate tolerant specimens there are, or jacking the hobby in.

Electricity might start to play on the minds of the fiscally conscious, too. As we’re encouraged to get our own monitors in the home to calculate what’s consuming what, I suspect that many will be alarmed at just how much a decent sized tank can cost to run. A handful of frantically spinning pumps, a couple of hundred watts of lighting, and a wheezing 300W heater or two all add up to become a financial burden, and given the balance of sacrificing the tank to the cause of improved monetary household harmony, I’ll wager that some might start to seriously consider a less power-hungry hobby.

Importation costs

The tropical fish we get in the UK tend not to come from within the British shores. Many will be far eastern, along with some European, American and African contributions. Wherever they’re coming from, they’re coming via planes. A continuous squadron of winged beasts bring us boxes of fish like a hovering conveyer belt, and we’ve become very reliant upon it.

Plane freight has been insidiously creeping upwards (no pun intened) for as long as I can remember. In fact, it’s the freight that frequently constitutes the majority cost of the livestock we buy. The trade might hate me for saying it, but a farmed guppy can be bought from Singapore or Malaysia for pennies. It’s only once it’s circumnavigated the globe, whizzing from one Hemisphere to the other that it has racked up a lot of airmiles, and those airmiles all add up to extra expenditure that needs to be reclaimed.

Now this isn’t the end of the earth for fish where you can cram a few hundred into a box for transit. In that case the cost is distributed about: each and every fish carries its own little fragment of expense, to be added to a mark up. But what of larger specimen fishes? What of the larger wild catfish that come one to a box? I suspect that this aspect of the hobby is fast becoming vulnerable.

Retailers, to their credit, strive to keep retail prices down on fish. You only have to look at the glacial creep of the value of staples like Neon tetra to realise that they’re becoming less and less profitable for the trader, though the competition and the market is fierce. These fish were about £1 each ten years back, and they’re still about £1 each now. Retailers know that they can’t crack the prices of many of these staples up without dissociating themselves like pariahs from the hobby, so they suffer in silence.

Time could force a trader’s hand and we could see incremental price hikes. The big concern is where the cut off point is for the hobbyist. £3 for a Neon? £25 for a Pictus catfish? African cichlids starting at £30?

Let’s rule nothing out, because a lot of factors are at play with pricing.

Release of fish into the UK

I have spent the last few weeks scathing at the irresponsible actions of a minority of those in the industry.

I’m not sure many of us realise just what kind of scrutiny we are under as a hobby. Whether we like it or not, we have enemies, and powerful ones at that, who see what we do as a threat. Many of our opposition and detractors are those in the angling community, who can have an unbalanced and solely derogatory view of us, and the perceived threat we could pose to their own industry.

We as aquarists maintain what amount to collections of alien species in our ponds and tanks. Sterlets are far from indigenous, nor are the various gobies, catfish, tetra and so on that we keep.

This taps back in to what I mentioned earlier, vis. disease of fish. Any one of us, anywhere in the world could, in theory, be sat on the equivalent of case zero. We already know that domestic shrimps can be carriers of White tail disease, an illness currently ravaging farms of commercial food shrimp. We don’t know if there’s any risk of native crayfish picking up this disease, and I don’t want to find out the hard way, but all it takes is for some bright spark to consider putting his or her shrimps in a pond at the height of summer, to then be promptly flooded so that the shrimps get into a local river and meet a crayfish. The outcome of that encounter isn’t hard to envisage.

Is that even feasible? Well, yes. Loads of aquarists were affected by this year’s flooding, and I’m open mouthed and speechless that some people are even trying to highlight to the national tabloids that their fish escaped. Already that’s opened a forum on whether those at risk of flooding are allowed to keep the fish that they do. But the last thing we want to be doing now is drawing excess attention to it.

If ecosystems in certain rivers or lakes are impacted by fish like sterlets, who do you think will take the blame? And what then, the ramifications for our trade? Suffice to say, if someone’s escapees blight the native fish of a county, the angling lobbyists and national newspapers will demonise us to the extent that we won’t be able to walk down the roads without being spat on.

Controls are in place to stop just this kind of thing from happening. Legislation already incorporates rules and laws about where non-natives may and may not be put. Dangerously invasive fish are denied entry to the country through the implementation of the Import of Live Fish Act.

Enter the imbecile. The imbecile is someone who, upon going against all of the advice of his retailer, decides to buy a gaggle of potentially invasive, non-natives that promptly outgrow his pond. The imbecile then takes the fish, in his desire to be rid, and upends them into a local waterway.

I’m not saying that any of us should sit back and await this to happen. Rather, we should be aware of such people, and be thoroughly prepared to dob them in at the first hint of trouble. Call me a snitch for that if you like, but I’m more interested in the welfare of UK waterways than I am in some puerile, school playground code of honour.

CEFAS would be a good port of call when reporting imbeciles like the one mentioned above. Even the local constabulary, when made aware that someone is intending to release non-natives into British waterways, will be obligated to do something. The release of non-natives is an illegal act, and we should all be guarded against it.

Anti-hobbyists would seize any opportunity to extirpate our industry, and it is essential that we don’t give them an easy opening to do so.

Environment degradation

This one isn’t something that we have too much say over, but where we do, we should.

Here’s a surprise for you. Some of the fish we currently keep are extinct in the wild. Red tailed sharks, for example, no longer have a native range. It was destroyed by damming, cities, irrigation and farming. Liquorice gouramis are going the same way, as their habitat is eaten up by Palm plantations. Certain African cichlids have vanished into the maws of Nile perch.

Degradation leads to extinction, and extinction means no new bloodlines. Eventually, that means inbreeding and variation. Now that’s fine if you fancy stores choc-full of Flowerhorns and the blandest of the bland in farmed staples, but with nothing interesting to offer, the trade might will be on its knees. It’ll certainly have no substance if there aren’t any decent fish left.

Legislation

A few paragraphs above, where I lamented the release of non-natives, I drew attention to the dangers of a few rogue aquarists jeopardising our hobby on a national scale.

Worse still is that our comrades in mainland Europe could just as easily spoil things for us by releasing fish there, too. Recall the recent debacle of the Golden apple snail. We Brits did nothing wrong on our own turf, but it transpires that a snail population was released and decided to make merry in the waters of Spain. After some investigation it was argued that the snails could just as easily invade and establish into certain water of East Anglia. Just like that, legislation was drafted and the snails banned from importation and movement between EU countries.

I choke every time I read about the likes of Pacu being found in Parisian rivers, or Cabomba strangling Dutch waterways. Each of these is the produce of an irresponsible aquarist out there somewhere, and all are potential trade cripplers for the whole continent.

It’s bad enough knowing that a slip up on our own shores could warrant investigation, but to know it’s possibly wrested from our hands altogether is outright harrowing. The idea that someone could upset the Euro trade of Callichthyds by being foolish enough to put Scleromystax into Italian rivers is a troubling one. Rhinogobius found in Austrian ponds could be the end of those little cuties for all of us, and so on.

Given how high the powers of Europe go, I’m not even sure we’d have the grounding or stamina to successfully fight our corner.

Autonomy is required, though how to gain it isn’t exactly clear. It’s certainly one for the regulatory bodies to ascertain, because I’m sure that like me, you don’t want to be held accountable for problems you were never part of.

Ethics

We’re all familiar with the idea of culture shock, and cross-generation differences. With each new generation the nation produces, the paradigm of attitudes and opinions alters ever so slightly.

It happens across so many different trains of thought that I’m almost stuck for choice, so examples are rife. Let’s start with obvious points like racism and sexism. If we go back 100 years, prevalent attitudes to females and foreign ethnicities were radically different to what they are today. That’s not to say that everybody was a xenophobic misogynist, but compared to today’s standard, the percentile of people who would have happily passed off derogatory comments about either was considerably higher than it is now.

Opinions and attitudes are often languidly slow to change, but change they do. The same applies to the world of animal ethics, too. Fifty years ago, the idea that someone might be tried for abusing a pig on a farm would have been near laughable. Flash forward to 2014, and the same person could expect to be near lynched, banned from working with animals, and possibly even subject to custodial sentence.

We’re seeing gradual encroachment into pet keeping, if you keep eyes peeled. How frequently do you now see cage birds on sale? Many retailers have abandoned them, and those that haven’t yet are often under pressure to do so. Again, just fifty years back a teenager wouldn’t have batted an eyelid at his or her mother keeping a canary in a cage. In the modern day, you’ll find increasing numbers of youngsters who would brand the act as cruel. It’s a gradual process.

We’ve already witnessed campaigns to get some fish out of aquatic stores. Giants like Pacu are increasingly considered ethically unsound, with the long term welfare consideration for the fish itself now ranking much higher than the novelty of keeping one for a while.

Retailers are becoming more switched on and savvy in their vetting of potential keepers. Ethics rank higher than pound signs in some stores, who will politely refuse a sale if they think the fish in question will not have its requirements yet. People care.

None of this is to say that we’re on a slippery slope that will eventually lead to a total rejection of fishkeeping by some future generation. We can, after all, dig our heels in before it gets runaway, and this is something that we should perhaps guard against. Showing ourselves in a positive light is essential, and perhaps more essential than ever if we’re to win over the minds of tomorrow’s keeper. Young people will be the future of the hobby, and if they reach hobby age having been influenced in such a way they think the trade negative, then it’s pretty much game over. No new fishkeepers, no continued hobby.

Zoonotic illness (Disease part two…)

I should probably include the caveat 'once grabbed by the mainstream media' for the above subheading.

Zoonotic illness alone is unlikely to wipe out fishkeeping, in the same way that recent TB cases acquired from cats won’t be leading to a global purge on felines any time soon.

But a devastating sob story pandering to our worst fears (I needn’t say which tabloids I brand as capable of this) and highlighting the loss of a hand or foot through some badly diagnosed, ill treated and runaway case of fish TB could quite easily inflict a wound from which we’ll never quite recover

The worst situation that could befall us would be a combination of tragic events. Someone young and immunocomprimised for whatever reason, picking up a particularly nasty strain of Leptospirosis, or something similar and dying would be a disaster in every way, not least of all for the individual concerned.

We know that hygiene is essential when working with tanks. We understand that getting unprotected hands with cuts in aquaria is to invite disaster, and we can eradicate this risk at source, just by being both aware of the hazards, and being aware of how to safeguard against them.

Just bear in mind that if you’re taking risks with your health for the sake of your hobby, then you’re not just putting your own neck on the line. If it all goes very, very wrong and you end up in a bad way, then you’re potentially messing it up for the rest of us.

Likelihood?

I’m upset that most of the factors above are in many ways beyond the remit of the day-to-day aquarist. Responsible buying can help to reduce the chance of disease and zoonosis, and voting with our wallets can promote retailers to purchase better quality and responsibly sourced stock.

Expenses are beyond our control, bar lobbying MPs and embracing efficiency where we can. Championing low running cost technology over higher wattage 'budget' alternatives will help such lines to grow, in turn safeguarding us in the longer run.

What is definitely in our grasp, and what I consider the biggest danger to us all, is not releasing fish in the UK. I cannot reiterate enough just how damning it would be for us to have subtropical species that are only sourced through our hobby turning up in native ponds and rivers.

I’ve harped on about it numerous times, but I’m not going to miss another opportunity to do the same. If you release your fish in to the wild, or are considering doing so, then shame upon you. I will have no truck with anyone who wants to jeopardise the hobby for all of us like that, and who also shows abject disregard for the wellbeing of their livestock.

Keep fish in their tanks where they are not a risk, and I beseech each and every one of you: if you know someone who’s planning to release, call the authorities and make them act on it. It’s your hobby at stake too.

Apr 122014
 

Original story by Pip Courtney, ABC News

A team of CSIRO scientists has cracked the holy grail of aquaculture by developing the world's first fish-free prawn food.

Prawns for sale, prawns have been found to grow up to 40 per cent faster on Novaq. Photo: Matt Brann

Prawns for sale, prawns have been found to grow up to 40 per cent faster on Novaq. Photo: Matt Brann

The royalties from worldwide licensing deals for the Novaq product will earn the CSIRO tens of millions of dollars.

"The research cost about $10 million. We are very confident that this will generate a return on investment back to Australian taxpayers of many, many times the initial investment," CSIRO's Dr Nigel Preston said.

There is intense global interest in Novaq because it solves one of the farmed prawn industry's biggest problems - its reliance on wild fisheries as a core ingredient in prawn food.

But aquaculture has reached "peak fish", where demand for wild harvested fish meal now outstrips supply.

Without a solution, soaring world demand cannot be met.

"It is absolutely a critical issue for the global aquaculture industry. There's no more room to get more wild harvest fish, so we've got to find alternatives," Dr Preston said.

This is really a game-changer. There's nothing like this that I've seen in my career and I may see nothing like this again.
CSIRO scientist Dr Nigel Preston

"A justifiable criticism about aquaculture is the continuation of catching wild fish, grinding them up and feeding to farm fish."

News of Novaq's development has caused huge excitement around the world, as many thought a fish-free food was impossible.

"It's the first really viable solution to not having to use wild harvest fish meal," Dr Preston said.

Australia's only producer of prawn food, Ridley, has the licence to make Novaq, and aims to have it on the market by the end of next year.

Industry set to grow with Novaq

Ridley's Bob Harvey says the industry will be able to flourish when it is no longer reliant on fish caught in the wild.

Ridley is aiming to sell the product to the world's biggest producer of prawns, Asia.

"There is a world shortage of prawns, there's an insatiable demand in South-East Asia for them," he said.

"Once you start getting into South-East Asia, you're talking millions of tonnes."

Mr Harvey says the opportunity is worth millions of dollars to the company.

"It's a long journey now to start to commercialise this, but the prize is significant," he said.

The Novaq formula is a closely guarded secret, but it is known that the product is based on microscopic marine organisms.

"They are so abundant one would have thought that the world would have paid more attention to them, but their misfortune is to be so small," Dr Preston said.

Novaq in use at an aquaculture facility. The industry is expected to grow without its reliance on fish caught in the wild. Photo: Landline

Novaq in use at an aquaculture facility. The industry is expected to grow without its reliance on fish caught in the wild. Photo: Landline 

"The eureka moment [was] that we should be able to use their abundance, and the fact they are a significant component of the natural diet of prawns at every stage of their life history."

Marine microbes are at the bottom of the ocean food chain and a decade ago scientists knew little about them.

The CSIRO team's first breakthrough was working out how to feed and then farm them.

"They are harvested when they are 40 days old. We then de-water the product. We drain it down and filter it and then we harvest the product as sludge or ... a mud," said CSIRO's Dr Brett Glencross.

"That product is dried before it gets milled and then included in a prawn feed."

Novaq speeds up prawn's growth

Novaq has delivered a second breakthrough, with scientists discovering prawns grow up to 40 per cent faster on the fish-free food.

"If you think of that in terrestrial terms, it's very rare to see," Dr Preston said.

"If you've got a chicken growing 40 per cent faster you'd think something was wrong. It was a surprise.

"This is really a game-changer, there's nothing like this that I've seen in my career, and I may see nothing like this again."

With farmers able to get more tonnes of prawns per hectare of pond space with the same input costs, the new feed will have a huge impact on profits and productivity.

It's going to make the animals grow better and bigger ... it sounds like the magic cure.
Prawn farmer Matt West

"Farmers can either get their prawns to market 30 per cent faster or they could have a prawn that's 30 per cent bigger," Dr Preston said.

Novaq offered more surprises by proving more nutritious than traditional fish-based feeds. Prawns fed the new diet were healthier and more robust.

"There's opportunities to start lifting carrying capacities in ponds and start to push more animals out, but the thing that excites us more is that growth potential," said the manager of Australian Prawn Farms Matt West.

Australian Prawn Farms at Ilbilbie, south of Mackay, has 33 hectares of ponds, and hopes to triple production by digging more on adjacent caneland.

Its plans have been hampered by a lack of access to power and tough environmental rules, but Mr West hopes Novaq can deliver an increase in yields without the need to push ahead with the extra ponds.

"It's going to make the animals grow better and bigger and stronger and more healthier ... it sounds like the magic cure," he said.

Novaq's arrival is perfectly timed, as supermarkets and customers increasingly demand seafood that is certified as sustainable.

"We as an industry do want to be clean and green, we want to go down more of the sustainability path and this is just one of the little ventures that we can do ... it has a sustainability tick," Mr West said.

Fish next on the CSIRO's agenda

Dr Preston hopes some of the millions of dollars the CSIRO earns from Novaq royalties will be spent finding the same solution for farmed fish. It is a much bigger market, but it is also more challenging.

"Because prawn feeds have about 25 per cent wild harvest fish meal in their formulation, with fish it's 40 to 50 per cent, but we do have the germ of an idea as we had for Novaq 10 years ago," he said.

CSIRO-developed Novaq is the world's first fish-free prawn food. Photo: Landline

CSIRO-developed Novaq is the world's first fish-free prawn food. Photo: Landline

"We assume it'll probably take 10 years but will be pleasantly surprised if it only takes five."

Dr Preston says it is crucial the work is done, as the aquaculture industry cannot grow unless it finds an alternative to current feed containing wild caught fish.

"One in two fish that everybody eats around the world is farmed so if we're going to continue to eat more fish, if we're going to meet those demands for the world's ever growing population, then it's going to be farmed seafood," he said.

"And if it's going to be farmed seafood it absolutely needs to be sustainable.

"We need to double fish production in the next 50 years ... so we need to come up with some innovation and I think providing Novaq for fish is probably the next step.' Dr Glencross said.

Landline's story on the Novaq breakthrough is on Landline on ABC1 on Sunday at noon.
Apr 122014
 

Media release from Springer

Rainbowfish raised in the wild braver than those bred in captivity, study shows

The boldest black-lined rainbowfish are those that are born in the wild. Also more fearless are those that analyze information both sides of their brains. This is the conclusion of Australian researchers Culum Brown and Anne-Laurence Bibost from Macquarie University, in a study published in Springer’s journal Behavioral Ecology and Sociobiology.

Melanotaenia nigrans, Scotts Ck, Adelaide River. Photo: Gunther Schmida

Melanotaenia nigrans, Scotts Ck, Adelaide River. Photo: Gunther Schmida

The preference to analyze and react to information with either the left or right hemisphere of the brain is called cerebral lateralization, and is widespread among vertebrates. Lateralization is seen in the preference of humans or parrots to use one hand or claw over the other or to always turn to the same side when moving around objects.

The researchers first tested wild rainbowfish against captive rainbowfish. They then used a modified version of the mirror test to find out if a fish showed a lateral preference to view itself with either its left or right eye. Levels of boldness were tested by timing how long it took a fish to emerge from a safe hiding place.

Non-lateralized fish that did not analyze information in a specific brain hemisphere were significantly bolder than both left- and right-lateralized fish. This suggests that fear is heightened when primarily processed by a single hemisphere, making lateralized fish less bold. Previous studies have shown that complex tasks are more difficult to perform when information processing is shared between two brain hemispheres. It therefore boils down to a question of speed. A non-lateralized fish in a potentially life-threatening situation must first draw information from both hemispheres, and compare and integrate it before it can make a decision. Strongly lateralized fish, on the other hand, can act more quickly because they only draw on information from a single hemisphere.

If non-lateralized fish process fear-related stimuli comparatively slowly or inefficiently, it may be that the moderating effect of fear is somewhat lessened in comparison to strongly lateralized fish. The researchers think this may result in a reduced level of fear generally, or perhaps the decision to explore is already made before the moderating effect of fear comes into play. Either scenario would adequately explain their observation that non-lateralized fish are bolder than lateralized fish.

The researchers were not surprised that wild fish were significantly bolder than captive-reared fish, as previous work they had done showed that populations that are hunted by predators were braver than those from low-predation areas.

“The similarities between personality and laterality are certainly intriguing and hint at a single underlying function or mechanism,” says Brown. “We suggest that these aspects of personality traits are actually caused by variation in laterality.”

Reference: Brown, C. & Bibost, A-L. (2014). Laterality is linked to personality in the black-lined rainbowfish, Melanotaenia nigransBehavioral Ecology and Sociobiology, DOI 10.1007/s00265-014-1712-0

Apr 112014
 

Original story by Jake Sturmer, ABC News

A new study of Australia's dirtiest and cleanest beaches has revealed some surprising results.

A red-footed Booby on a polluted beach in Australia. Photo: Dr Denise Hardesty, CSIRO

A red-footed Booby on a polluted beach in Australia. Photo: Dr Denise Hardesty, CSIRO

CSIRO researchers have spent two years surveying Australia's entire coastline, counting rubbish on sections of sand and sea every 100 kilometres.

Australia's dirtiest and cleanest beaches

NSW

  • Dirtiest: Shelly Beach, Manly
  • Cleanest: Red Rock Beach, NSW North Coast

Northern Territory

  • Dirtiest: Cape Arnhem
  • Cleanest: Cape Hay

Queensland

  • Dirtiest: Barney Point Beach, Gladstone
  • Cleanest: Mackay

South Australia

  • Dirtiest: Border Village (SA)
  • Cleanest: Nora Creina

Tasmania

  • Dirtiest: East Kangaroo Island (West Gulch)
  • Cleanest: Cape Grim

Victoria

  • Dirtiest: Pearse's Road Beach
  • Cleanest: Gibbs Track Beach, Lakes Entrance

Western Australia

  • Dirtiest: Ellensbrook Beach
  • Cleanest: 80 Mile Beach

Source: CSIRO

The survey of more than 175 beaches found the dirtiest beach in Australia was Border Village on the coast between Western Australia and South Australia.

This was typical of the study that found remote and hard to reach beaches were among Australia's most grotty.

Lead researcher Dr Denise Hardesty says the rubbish did not float in from polluted oceans abroad.

By using ocean current data and examining the items, researchers could tell much of the mess fell from the hands of ordinary Australians.

"In general most of what we find is from us,'' Dr Hardesty said.

"No matter how remote you are, how close you are to an urban city, we leave our litter everywhere."

Illegal dumping, irresponsible mariners and careless beachgoers are all to blame, she says.

Researchers are suggesting increased regulation and enforcement, particularly of illegal dumping.

"We aren't doing as well as we could, as we need to be doing, in terms of waste management,'' Dr Hardesty said.

More than 150 million pieces of rubbish

The CSIRO study estimates more than 150 million pieces of rubbish litter Australia's sand and shores.

The most common item was plastic following rapid growth in global plastic production.

"More than three-quarters of what we find in terms of rubbish is plastic,'' Dr Hardesty said.

This had a disastrous effect on some 600 marine species who then consumed what researchers have termed "plastic food".

Dr Hardesty said she had found cigarette lighters, toothbrushes, pill bottles and bottle caps in the stomachs of birds.

"We open turtles that have died and see that they're jammed full of plastics,'' she said.

"I've found over 200 pieces of plastic in a single bird."

Communities cleaning up Australia

Retired plastic surgeon John Hanrahan and other former professionals have formed a group to clean up the waters off Western Australia's sunny Abrolhos Islands.

They visit once a year to clean up the mess left by tourists and fishermen over the decades.

"To me they are unique islands in this part of the world, they're coral islands, they're well south of the usual position and it seems to be sacrilege to let them deteriorate,'' Mr Hanrahan said.

"I think we all have a responsibility to look after these islands and part of looking after them, in my view, is cleaning up the refuse.

"What I'd like to see is other people take up the cause as it were and say 'yes all right, we can do a little bit'.''

Migratory shore birds on 80 Mile Beach in Western Australia. Photo:  Matt Brann, ABC

Migratory shore birds on 80 Mile Beach in Western Australia. Photo: Matt Brann, ABC

Apr 102014
 

News release from Pensoft Publishers

Hidden in one of Australia's most developed and fastest growing areas lives one of the world's smallest freshwater crayfish species.

The eastern swamp crayfish Gramastacus lacus sp. n.  a new species of freshwater crayfish from coastal New South Wales, Australia.

The eastern swamp crayfish Gramastacus lacus sp. n. a new species of freshwater crayfish from coastal New South Wales, Australia.

Robert B. McCormack the Team Leader for the Australian Crayfish Project described the new species belonging to the genus Gramastacus, after 8 years of research in the swamps and creeks of coastal New South Wales, Australia. The study was published in the open access journal ZooKeys.

Being a small crayfish species it has remained undescribed and undiscovered in one of the fastest developing regions of Australia. Only one other species of Gramastacus crayfish is known and it occurs some 900 km away in the Grampians region of Victoria.

This new species is found in lowland ephemeral habitats surrounding coastal lakes and lagoons from Wamberal Lagoon, north along the coastal strip to Wallis Lake. Being dependent on regular natural flooding and drying cycles, only lowland, swampy areas are suitable for this tiny crayfish.

Each crayfish digs a small rounded cross-section burrow up to one metre deep into the water table to survive the drying cycle. Some areas are riddled with these small burrows as they are a very prolific species and can occur in very high numbers in small habitat areas.

The newly described crayfish are found in one of Australia's most developed regions. Unfortunately, this means that much of their habitat has been lost in the past as these ephemeral areas are the first to be drained or reclaimed to make way for agriculture, industry, housing developments, golf courses, infrastructure, etc. Now, being found and officially described, this crayfish must be considered in any further developments and hopefully future habitat loss will be reduced.

The scattered populations of Gramastacus seem highly fragmented and many are increasingly threatened by a range of risks other than human development. Invasive crayfish, pest fish species like plague minnows and swordtails, rising sea levels and falling water tables all are increasing dangers. Luckily, the large number of National Parks and Reserves along the coastal strip provides safe refuges for some populations.

###

About the Australian Crayfish Project

Started in 2005 The Australian Crayfish Project (ACP) is a privately funded project run entirely by volunteers with a thirst for knowledge on freshwater crayfish. We all freely give our time and resources to support the project. Australia has one of the most diverse ranges of freshwater crayfish species on the planet yet there is much confusion with the description and distribution of species and many species remain undiscovered & undescribed. The project is discovering dozens of new species or new populations that were never known to exist. Our aim is to find and identify all species of freshwater crayfish and their habitat, the bottom line is that if no one knows these species are there and they don't even have a name then how can they be protected and conserved into the future? The results of this project will ensure that all management agencies take the crayfish and their habitat into consideration for future environmental, conservation, development and catchment management plans, etc.

Australia's unique crayfish are important keystone species which have a disproportionately large effect on the whole catchment relative to their abundance. They play a critical role in maintaining the structure of the whole ecological community, their prosperity and abundance directly affecting the health and abundance of numerous other species (macroinvertebrates, fish, eels, turtles, lizards, snakes, water rats, platypus and birds, to name just a few) in the ecosystem. Please help us help the crayfish and all the other species that rely on them for their survival. http://www.aabio.com.au/the-australian-crayfish-project/

The Australian Crayfish Project (ACP).

Additional Information

Article under conservation and research Australian Aquatic Biological.

For a full list of all Australian Freshwater Crayfish: http://www.aabio.com.au/crayfish-list/

Original source

McCormack RB (2014) The eastern swamp crayfish Gramastacus lacus sp. n. (Decapoda, Parastacidae) a new species of freshwater crayfish from coastal New South Wales, Australia. ZooKeys 398: 53–67. doi: 10.3897/zookeys.398.7544