Differences in reproductive strategies of male and female fishes are presumably accompanied by differences in nutrient allocation and predicted to lead to divergence in body composition between the sexes. We compared patterns of variation in fatty acid profiles of lipids extracted from ova, liver, muscle and visceral fat between mature male and female walleye (Sander vitreus) sampled from two wild spawning stocks. Fatty acid profiles differed significantly among body tissues in both males and females, with the strongest contrast between muscle and visceral fat. Significant differences in fatty acid composition between the sexes were found in liver, muscle and visceral fat tissues. Variation among sexes and populations was greater in liver than in the other tissues. Female livers had lower relative abundances of palmitic acid (PA, 16:0) and oleic acid (OA, 18:1(n‐9)), and higher relative abundances of arachidonic acid (ARA, 20:4(n‐6)), eicosapentaenoic acid (EPA, 20:5(n‐3)) and docosahexaenoic acid (DHA, 22:6(n‐3)) compared to male livers. In addition, female muscle had higher relative abundance of OA and lower relative abundance of DHA compared to male muscle. Our results illustrate the differential effects of reproductive demands on the biochemical composition of males and females and have implications for the analysis of fatty acid profiles in studies of wild fish populations.

中文翻译：

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成年角膜白斑脂肪酸组成的性别差异

雄鱼和雌鱼的繁殖策略不同，大概伴随着营养分配的差异，并预计会导致两性之间的身体组成差异。我们比较了成熟的雄性和雌性角膜白斑（Sander vitreus）从卵，肝，肌肉和内脏脂肪中提取的脂质的脂肪酸谱的变化模式）从两个野生产卵种群中取样。男性和女性的身体组织中的脂肪酸分布差异显着，肌肉和内脏脂肪之间的对比最强。在肝脏，肌肉和内脏脂肪组织中发现两性之间的脂肪酸组成存在显着差异。肝脏中性别和人群之间的差异大于其他组织。女性肝脏的棕榈酸（PA，16：0）和油酸（OA，18：1（n -9））的相对丰度较低，而花生四烯酸（ARA，20：4（n -6）的相对丰度较高。），二十碳五烯酸（EPA，20：5（n-3））和二十二碳六烯酸（DHA，22：6（n‐3））与男性肝脏相比。此外，与男性肌肉相比，女性肌肉的OA相对丰度较高，DHA的相对丰度较低。我们的结果说明了生殖需求对雄性和雌性生化成分的不同影响，并且对野生鱼类种群研究中的脂肪酸谱分析具有重要意义。