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Wild Fish Stocks Threatened

by the Fish Site Editor
24 March 2010, at 12:00am

SCOTLAND, UK - The Salmon & Trout Association has published a report on scientific studies into the environmental impact of currentsalmon farming operations.

It reveals a devastating catalogue of malpractice in the way salmon farming is impacting wild salmon, sea trout and the marine environment, and provides incontrovertible proof that it is a sword of Damocles suspended over some of Scotland’s most iconic natural resources. It accuses the multi-million pound salmon farming industry of precipitating an environmental disaster, and calls for a nine-point survival plan to be actioned immediately.

The report’s main findings provide evidence that:

  • Fish farm parasites can kill young wild salmon and sea trout
    Studies show as many as 80 per cent of juvenile salmon and sea trout are killed by sea lice allowed to breed in massive numbers in open cage system salmon farms. Sea lice are a natural salmonid parasite, but infestations on this scale can kill.

  • Salmon farming could force wild salmon into extinction
    Gene pools could be destroyed in decades by the inter-breeding of farmed fish escapees with natural populations – some Norwegian rivers already have breeding populations of up to 80 per cent fish escaped from farms. It is impossible to prevent escapes from open cages, or for escapees to interbreed with wild fish stocks. Evidence shows that these hybrids do not thrive in the wild, and so could significantly impact native stocks, which within a few generations.

  • Salmon farming sewage can poison the sea bed
    The effluent produced by farmed salmon, together with the chemicals and antibiotics used to treat fish, can become established in estuaries, lochs and inshore zones close to fish farms, smothering natural aquatic life and increasing nutrients to unnatural levels.

Paul Knight, CEO of the Salmon and Trout Association said that: "Aquaculture (fish farming) practiced sustainably can offer enormous benefits to mankind and significantly reduce the pressure on our precious wild oceanic stocks. But the scientific literature unequivocally demonstrates that fish farms, as presently constructed and operated, are having a disastrous impact on native fisheries, the wider environment and the many public benefits associated with it.

"Quite apart from the Salmon and Trout Association's nine point action plan to counter impacts that our report shows are already scientifically proven – especially from sea lice and farm escapees - we urgently need more research into the effects of all the waste material and veterinary chemicals swilling about Scotland’s West Coastal waters and lochs, particularly with so many valuable shell fish stocks in the immediate area."

The Salmon and Trout Association, together with colleagues from Fish Legal, the Association of Scottish Fishery Boards (ASFB) and the Rivers and Fisheries Trusts of Scotland (RAFTS), is calling on the Scottish government to act before it is too late to save wild Scottish salmon and sea trout.

The Association believes that a nine-point plan must be implemented as a matter of urgency.

It says that the long term target of the industry and Scottish Government must be for the universal use of enclosed systems for rearing fish, therefore cutting out any interaction between farmed and wild salmon and sea trout. A timescale for this transition should now be agreed between Government, industry and wild fish organisations.

The Association's head of science, Janina Gray said: "It has been a sobering experience researching the evidence surrounding the interaction between salmon fish farming and wild fish stocks. The evidence is clear that aquaculture can have a significantly negative impact, in some areas, on wild salmon, sea trout and their environment. We must learn from the scientific evidence available, enforce the precautionary principle and take action before it’s too late.

We now look forward to Dr Ken Whelan, of the Atlantic Salmon Trust, publishing his paper later in the spring, focussing on the impact of sea lice on wild salmonids.”

Paul Knight concludes: “It must be the Government’s statutory responsibility, and the industry’s moral one, to protect two of Scotland’s most valuable and iconic natural resources – wild salmon and sea trout – before it is too late. We will do everything possible to ensure their survival, and to this end we call upon the Scottish Government and salmon farming industry to respond to this challenge.”

View the full report here: http://www.salmon-trout.org/issues_aquaculture.asp.

the Fish Site Editor

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