Hatchery-Wild Interactions Systematic Literature Review

After a search and screening process designed to be unbiased and extensive, an initial list of 4974 publications was screened down to a total of 112 relevant studies and literature reviews directly addressing interactions between wild and hatchery-origin salmon (with 85 of those suitable for analysis). The studies were categorized based on the nature of the interaction between hatchery-origin and wild fish that was explored and then assessed as to whether that interaction was positive, negative, or had no effect. The categories were: genetics, competition, population mixing, fish heath, and outcomes based studies. The majority of studies (50, including 7 literature reviews) found a negative effect of hatchery fish interactions with wild fish, whereas only two studies demonstrated a positive effect and 33 studies had no reported effects. The most studied category of interaction was genetics, the most studied species was Chinook, and the majority of studies were carried out in the United States.