Does maternal captivity of wild, migratory sockeye salmon influence offspring performance?

作者：Sopinka N M^*; Middleton C T; Patterson D A; Hinch S G

来源：Hydrobiologia, 2016, 779(1): 1-10.

DOI：10.1007/s10750-016-2763-1

• Cortisol
• Egg
• Fish
• Intergenerational effects
• Swimming
• Stress

The environment females experience during sexual maturation can have cascading effects on offspring. For free-swimming populations of wild fish, ecological factors including predation and competition are known to alter offspring phenotype. For wild-caught fish targeted for stock enhancement, logistical factors, such as the widespread practice of holding fish in captivity/confinement, also have the potential to modify offspring phenotype. Understanding how maternal captivity affects offspring, in comparison to offspring reared from fish that have matured in the wild, is an important but relatively understudied aspect of fish culture. We examined egg and offspring traits for wild-caught female sockeye salmon reared in captivity during the final stages of sexual maturation or captured on spawning grounds following in-river maturation. Compared to females that matured in-river, captive females had smaller eggs and offspring in poorer body condition. These same offspring did however swim for longer durations. These results suggest that maternal captivity prior to spawning elicits intergenerational phenotypic change. Whether captivity-induced maternal effects are maladaptive/reduce offspring fitness will be dependent upon the environment in which offspring are being released into (e.g. captive or wild). Intergenerational effects of short-term captivity of wild fish may be a contributing mechanism mediating the success of fisheries supplementation programmes.

• 出版日期2016-10