Further Concerns
Kudoa thyrsites (soft flesh syndrome) is caused by a parasite that "infects muscle tissue
of the fish host and in some cases causes unsightly white cysts and softening
of flesh in fillets . . . In extreme cases infections of the parasite can
result in post mortem myoliquefaction where the muscle tissue takes on a
jelly-like condition."[1],[2]
In addition to concerns about environment impacts, this parasite is of strong
economic concern to industry with the Department of Fisheries and Oceans (DFO)
financing research for its suppression.[3]
Kudoa is acknowledged as being a factor in "disappointing" financial results
for Marine Harvest Canada in 2010 and 2008.[4],[5]
Use of high-powered (1000 watt) lights to delay maturation of the fish and, thereby,
increase growth. The lights
attract wild fish, increasing the chance of predation. The use of high-powered
lights in the marine environment (i.e. "pit-lamping") is contrary to regulations
in the Fisheries Act.[6]
Introduction of additional toxins into the environment as a result of using anti-foulants on nets e.g. the copper based "Flex-C".[7],[8],[9]
Potential amplification of fat-soluble toxins.[10],[11],[12],[13]
Bycatch of wild species such as black cod, herring and pink salmon smolts when Atlantic salmon are being transported and harvested..[14] Note that in October, 2011 one company pled guilty to charges of bycatch. ,[15]
Use of colouring additives in the feed of farmed Atlantic salmon.[16],[17]
The potential future use of genetically modified Atlantic salmon.[18]
[12] Foran JA et al. Quantitative Analysis of the Benefits and Risks of Consuming Farmed and Wild Salmon. J. Nutr 2005 135:2639-2643
