Noninvasive genetic sampling is an important tool in wildlife ecology and management, typically relying on hair snaring or scat sampling techniques, but hair snaring is labor and cost intensive, and scats yield relatively low quality DNA. New approaches utilizing environmental DNA (eDNA) may provide supplementary, cost-effective tools for noninvasive genetic sampling. We tested whether eDNA fro...

Suboptimal vitamin D status is common among humans, and might increase bone resorption with subsequent negative effects on bone health. Fatty fish, including Atlantic salmon, is an important dietary vitamin D source. However, due to a considerable change in fish feed composition, the contribution of vitamin D from salmon fillet has been reduced. The main objective was to investigate if intake o...

Body dimensions and swimming speeds of Atlantic salmon (Salmo salar) and chinook salmon (Oncorhynchus tshawytscha), ranging in weight from less than 1 to over 6 kg, were used to calculate the power needed to overcome drag. Fish were kept in 15 m×15 m×15 m deep cages, stocked under typical industrial conditions and fed to apparent satiation by broadcasting feed over the water surface. The averag...

Farm Atlantic salmon escape and invade rivers throughout the North Atlantic annually, which has generated growing concern about their impacts on native salmon populations. A large-scale experiment was therefore undertaken in order to quantify the lifetime success and interactions of farm salmon invading a Norwegian river. Sexually mature farm and native salmon were genetically screened, radio t...

—Hatchery-reared salmon have been reported to be inferior to wild fish in some studies and competitively superior in others. We examined the influence of early rearing environment (hatchery versus natural) on the summer survival, movement, and growth of genetically similar juvenile coho salmon Oncorhynchus kisutch in streams. In each of 2 years, 5,000–10,000 fry from a hatchery cohort were plac...

Seven of 118 wild-caught chinook salmon Oncorhynchus tshawytscha had histologic signs of plasmacytoid leukemia (PL). A pooled tissue sample from 2 of these PLpositive f ~ s h was examined and found to be Infected with a retrovirus as ~ndicated by the elevated reverse transcnptase activity associated with a density of 1.17 g cm-3 in sucrose and polypeptides with identical electrophoretic mobilit...

Quantifying the variability in the delivery of ecosystem services across the landscape can be used to set appropriate management targets, evaluate resilience and target conservation efforts. Ecosystem functions and services may exhibit portfolio-type dynamics, whereby diversity within lower levels promotes stability at more aggregated levels. Portfolio theory provides a framework to characteriz...

Marine Scotland is the directorate of the Scottish Government responsible for the integrated management of Scotland's seas. Marine Scotland Science (formerly Fisheries Research Services) provides expert scientific and technical advice on marine and fisheries issues. Scottish Marine and Freshwater Science is a series of reports that publish results of research and monitoring carried out by Marin...

soon to be approved gM salmon can mate with wild trout AquaBounty, a biotech company headquar-tered in Maynard, MA, is in the process of gaining FDA approval for their transgenic salmon, potentially making them the first GM animals to be approved for human consumption. AquAdvantage® salmon include a gene from the Chinook salmon, which provides the fish with the potential to grow to market size ...

Salmon gill disease in Norway is most cases associated with a range of different pathogens, stress and environmental factors. Paramoeba perurans other amoebae have been isolated during such outbreaks. Other from salmon include P. pemaquidensis, Tetramitus sp. Vannella Here we tested the pathogenicity first 2 species challenge experiments. We found that even when clonal cultures pemaquidensis es...