Death of the Wild Salmon Reading Answers

The last few decades have seen an enormous increase in the number of salmon farms in countries bordering the north Atlantic. This proliferation is most marked in two countries famous for their salmon, Norway and Scotland. Salmon farming in Norway and Scotland has expanded to become a major industry and as the number of farmed salmon has exploded, the population of its wild relatives has crashed. The rivers of these countries that used to have such great summer runs of fish every season that they used to attract thousands of anglers from all over the world are now in perilous decline. Recently Truls Halstensen, a Norwegian fishing writer, wrote that his local river, the Driva, where he used to be able to catch five or more fish of over 20 pounds weight in a morning, is now almost totally fishless. The link between the increase in farmed salmon and the decline in the wild population is hotly disputed. 

Environmentalists claim that the increase in farming has affected wild salmon and the sea environment in various ways. Firstly it is claimed that the mass escapes of farmed fish present a grave threat to the gene pool of wild salmon stocks. Escapees breed less successfully than wild salmon but the young of the escapees, known as parr, breed aggressively and can produce four times more successfully than their wild counterparts. The parrots bred by escapees also become sexually active far sooner than wild Salmon and fertilize more eggs. The farmed salmon are therefore genetically changing the wild salmon stocks. Jeremy Read, director of the Atlantic Salmon Trust points out that: "the major problem of interbreeding is that it reduces a population's fitness and ability to survive. Native salmon have evolved to meet the circumstances and habitat of sea and river lite. Farm fish are under very different selection pressures in an artificial habitat. This could leave the world with a north Atlantic salmon which thrive in salmon farm conditions and their increase in number means that wild salmon and other fish entering waters is another fish eating bees, since farms can fall prey to the lice.

Another difficulty and one of the most worrying side effects of the salmon farm industry is that salmon farmers cannot function without vast quantities of tiny sea creatures to turn into food pellets to feed their stock. Lars Tennson of the Norwegian Fishermen 's association complains that " the huge quantities of small fish caught by industrial trawlers is helping to strip fishing grounds of the small fish and of other species, including wild salmon, that depend on the feed fish." Fish farms are also being blamed for increasing levels of nitrogen in the ocean. Over the last 2 years there have been 26 effluent leaks involving nitrogen-rich fish droppings. Naturally occurring algae feed on this and grow into large toxic blooms that kill most other marine life.

Even legal chemicals used in farms, such as those used to combat the sea lice, can unbalance microorganism populations affecting the other organisms that feed on them. Kevin Dunnon, director of FEO Scotland, has warned that "using inappropriate chemicals and medicines has the potential to do real environmental damage... We will prosecute if we find enough evidence. In spite of the evidence that farming is harming fish populations, fish farmers are adamant that they are not responsible. Nick Jury insists that "algal blooms and the decline in fish stocks have occurred naturally for decades because of a wide range of unrelated and more complex factors." 

Jury feels that fish farms are being made a scapegoat for lack of government control to think that this problem has been recognized and that the roots of the problems have been attacked by laws passed by them. Fishermen, at sea and in estuaries, have been set quotas and many salmon rivers have been closed to fisherman. Poachers are more difficult to control but their effect is not as marked as that of the fishermen. Angus Kilrie of the NASF feels that the efforts have been wasted: "Legislation has merely scratched the surface. Not enough money has been forthcoming to compens fishermen and the allowances have been set too high."

The fate of the wild Atlantic salmon is anybody's guess. Farmers and governments seem unworried, environmentalists fear the worst. Wild Scottish salmon stocks this year have actually gone up this year which is heralded by the UK's fisheries department as a result of their policies. Paul Knight, Director of the Salmon and Trout Fishing Association has stated that he is "delighted with the upturn in numbers this year." He adds the warning that " there are still significant threats to salmon stocks and that it is important not to take our eye off the ball. Statistics though can always be interpreted in different ways. All issues concern the health of the wild north Atlantic salmon need to continue to be addressed in order to protect the viability of future runs