Environmental Science · Nature and Landscape Conservation
A review of 51 Pacific salmon reintroduction programs in western North America found that most assessed populations were stable or increasing. The authors also describe ecological and cultural benefits, while emphasizing the need to identify and reduce risks linked to reintroduction and to inaction.
A genomic study of wild Atlantic salmon across North America suggests that interbreeding with escaped farmed salmon could interfere with genetic differences linked to local climate adaptation. The researchers say this interaction may add to the effects of climate change, although the study did not directly measure how introgression changes salmon survival or climate responses.
Researchers have described Stolephorus lotus, a previously unknown anchovy species from Australia’s Northern Territory. Its identification is based on several physical features that distinguish it from two related species.
A three-month pond experiment found that nutrient ratios in the digestive tissue of largemouth bass were linked to the abundance of Crepidistomum parasites. The tissue measure explained more variation in parasite abundance than any other variable measured, although the study could not show whether it directly affected the parasites.
A chromosome-level genome of the Chinese algae eater has helped researchers resolve difficult relationships among minnows, carps, loaches, suckers and their relatives. Comparing gene order across 43 fish genomes strongly supported a close evolutionary relationship between suckers and minnows and carps.
A study of catch-and-release bogue found that deeply hooked fish had similar survival outcomes whether anglers used a de-hooker or cut the line. Loss of orientation and bleeding were associated with mortality, making prevention of deep hooking the most effective way to reduce harm.
