大湖银大麻哈鱼（Oncorhynchus kisutch Walbaum）血浆皮质醇和性类固醇水平与繁殖力和鱼卵存活率的关系

Plasma cortisol and sex steroid levels in Great Lakes coho salmon (Oncorhynchus kisutch Walbaum) in relation to fecundity and egg survival.

作者信息

Morrison P F, Leatherland J F, Sonstegard R A

出版信息

Comp Biochem Physiol A Comp Physiol. 1985;80(1):61-8. doi: 10.1016/0300-9629(85)90679-6.

Abstract

Plasma 11-ketotestosterone and cortisol levels in spawning male and female coho salmon (Oncorhynchus kisutch Walbaum) collected from a Lake Erie (Pennsylvania) stock were significantly lower (P less than 0.01) than in stocks of coho salmon at a comparable stage of sexual development collected from Lakes Ontario (two stocks) or Michigan. Plasma testosterone levels in female coho salmon from Lake Erie were significantly lower (P less than 0.01) than in females from Lake Ontario or Lake Michigan stocks. There were no significant differences in plasma testosterone levels in the males, or 17 beta-estradiol levels in male or female salmon of the four stocks sampled from the three study lakes. This apparent dysfunction in androgen and cortisol secretion in the Lake Erie stock is correlated with and may account for the low fecundity and poor expression of secondary sexual characteristics in that stock.

摘要

从宾夕法尼亚州伊利湖种群采集的产卵期雄性和雌性银大麻哈鱼（Oncorhynchus kisutch Walbaum）的血浆11-酮睾酮和皮质醇水平，显著低于（P < 0.01）从安大略湖（两个种群）或密歇根湖采集的处于相似性发育阶段的银大麻哈鱼种群。伊利湖雌性银大麻哈鱼的血浆睾酮水平显著低于（P < 0.01）安大略湖或密歇根湖种群的雌性。在从三个研究湖泊采样的四个种群的雄性中，血浆睾酮水平以及雄性和雌性鲑鱼的17β-雌二醇水平均无显著差异。伊利湖种群雄激素和皮质醇分泌的这种明显功能障碍与该种群的低繁殖力和第二性征表达不佳相关，并且可能是其原因。