Because adult salmon return to the rivers where they were reared to reproduce, origin river is a key to a salmon population’s status. A new framework for certifying wild salmon allows individual retailers to develop criteria for certification based on specific salmon-bearing rivers. The criteria emphasize the identity and abundance of the river-specific salmon stocks […]
Tag: salmon
Salmon like the dark side
Salmon living in tanks with darker backgrounds are typically less aggressive than those living in a lighter coloured environment, according to new research. The researchers divided 100 Coho Salmon into 10 different tanks, each with different colour patterns, and monitored their behaviour. They found that the salmon prefered the darker areas, and were less aggressive […]
Wild salmon reproduce better than hatchery ones
Hatchery salmons are often introduced into rivers to support wild populations, which are in an overall state of decline, but new research suggests this may not be an effective method. A study of 196 Coho salmons (Oncorhynchus kisutch) shows hatchery males have lower reproductive success than wild ones. When occupying the same position in the […]
Coastal wolverines eat salmon
In British Columbia, wolverines normally occupy mountain habitats and are rarely found near the coast. Nevertheless, a new study not only documents wolverines on Princess Royal Island for the first time, but uses nitrogen isotope analysis to infer that the animals were likely eating salmon. (Article available on request.).
Sea lice have unexpected effect on chum salmon
Fisheries data from British Columbia show that when sea lice infest populations of pink and coho salmon, their productivity suffers. Surprisingly, this correlation is not present for chum salmon, which are less popular among predators. A new study uses mathematical models to explore one possible explanation: by slowing down all species, sea lice provide predators […]
