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1989: Furunculosis, a bacterial disease, spreads through Norwegian salmon farms and wild salmon. 1996: World farmed salmon production exceeds wild salmon harvest. 2007: A 10-square-mile (26 km 2 ) swarm of Pelagia noctiluca jellyfish wipes out a 100,000 fish salmon farm in Northern Ireland .
The liver may be pale, mottled with red hyperemic areas, the kidney may be swollen and unusually red, the spleen may be swollen, and the digestive tract may be empty. [ 21 ] External signs are not always present, but if they are, hemorrhaging on the skin's surface can appear as anywhere from tiny red dots (petechiae) to large red patches.
An overview of farmed- to wild-salmon interactive effects. Salmon Farming Problems Coastal Alliance for Aquaculture Reform. An overview of environmental impacts of salmon farming. Fish farms drive wild salmon populations toward extinction Biology News Net. December 13, 2007. Salmonid parasites University of St Andrews Marine Ecology Research Group.
1. Farm-Raised Salmon. Some farm-raised salmon may contain more parasites than its wild-caught counterpart due to the densely populated conditions of fish farms, which can foster a breeding ground ...
The transfer of parasites from open-net cage salmon farming, especially sea lice, has reduced numbers of wild salmon. The European Commission (2002) concluded, "The reduction of wild salmonid abundance is also linked to other factors but there is more and more scientific evidence establishing a direct link between the number of lice-infested wild fish and the presence of cages in the same ...
In 1972, Gyrodactylus salaris, also called salmon fluke, a monogenean parasite, spread from Norwegian hatcheries to wild salmon, and devastated some wild salmon populations. [45] In 1984, infectious salmon anemia (ISAV) was discovered in Norway in an Atlantic salmon hatchery. Eighty per cent of the fish in the outbreak died.
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Breaking it down further into two primary categories—wild salmon and farmed salmon—wild-caught salmon has several advantages, but farmed salmon still offers an array of nutritional upsides.