Experimental crossbreeding reveals strain-specific variation in mortality, growth and personality in the brown trout (Salmo trutta).

摘要: Although hybridization between populations with low genetic diversity may induce heterosis, it can also lead to reduced fitness of hybrid offspring through outbreeding depression and loss local adaptations. Using a half-sib mating design, we studied on brown trout (Salmo trutta) how migratory hatchery-strain females males from various strains would affect early mortality, growth personality in F1 offspring. No differences mortality or alevin body length were found the crossing groups by end yolk-sac stage. At later developmental stages, higher slower one geographically distant indicated potential depression. The component indicating boldness exploration tendency showed fairly variation no phenotypic among while related freezing behavior stronger responses purebred cross strain when compared two other strains. However, hatchery possessed additive for explorative behavior, weaker wild × hatchery group. Our results add cumulating evidence risks stocking fish non-native origins.