US: Hatchery fish releases adversely affect wild salmonid populations, research finds

Published 2024년 1월 9일

Tridge summary

A recent literature review of over 200 studies on the release of hatchery salmonids found that it often negatively affects wild salmonid populations in marine and freshwater environments. The review focused on publications from 1970 to 2021 and studied fisheries in the United States, Canada, France, Spain, and Norway.. While hatchery releases can increase stock abundance and aquaculture success, they can also disrupt wild populations due to competition for resources and reproductive opportunities, as well as the introduction of maladaptive behaviors in future generations.

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Original content

A recent literature review that analyzed over 200 studies focusing on the release of hatchery salmonids, which include species such as salmon, trout, and char, revealed hatchery releases often adversely affect marine and freshwater wild salmonid populations.The research, “A global synthesis of peer-reviewed research on the effects of hatchery salmonids on wild salmonids," which appeared in Fisheries Management and Ecology, scoured over 50 years’ worth of publications published between 1970 and 2021. Over half the publications studied fisheries in the United States, with other countries studied including Canada, France, Spain, and Norway. The research primarily focused on the effects releases have on 15 species, such as brown trout, steelhead trout, Chinook salmon, and Atlantic salmon.While the release of hatchery salmonids typically lead to an increase in stock abundance and overall aquaculture successes, those gains are often counterbalanced by genetic and ecological disruptions ...

Source: Seafoodsource