We analyzed ovarian dynamics of anadromous blueback herring, Alosa aestivalis, in Connecticut River with the principal aim of exploring oocyte recruitment and how it shapes the fecundity pattern. We examined the oocyte release strategy and analyzed spawning cyclicity by linking oocyte growth to the degeneration of postovulatory follicles. Females were accordingly classified as pre‐spawners, early and late active spawners, and oocyte recruitment intensity was compared among the different spawning phases. Oocyte recruitment occurred continuously and in parallel with spawning activity, a pattern which is diagnostic of indeterminate fecundity. However, both fecundity and oocyte recruitment intensity progressively decreased (tapered) throughout spawning, until the ovary was depleted of vitellogenic oocytes. There was no massive atresia of vitellogenic oocytes at the end of the spawning season, which is atypical of indeterminate spawners. We propose that tapering in oocyte recruitment and fecundity is an adaptation to the high energetic expenditure of the upstream spawning migration.

中文翻译：

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美国康涅狄格河的蓝鲱鱼（Alosa aestivalis）中的卵巢动力学和生殖力调节

我们分析了蓝背鲱鱼（Alosa aestivalis）的卵巢动力学，位于康涅狄格河，其主要目的是探索卵母细胞的募集及其对生殖力模式的影响。我们检查了卵母细胞的释放策略，并通过将卵母细胞的生长与排卵后卵泡的变性联系起来分析了产卵周期。因此，将雌性分类为产卵前，活动早期和晚期产卵，并比较了不同产卵阶段的卵母细胞募集强度。卵母细胞的募集连续不断地发生，并与产卵活动同时发生，这是一种不确定的繁殖力的诊断模式。但是，在整个产卵期，繁殖力和卵母细胞募集强度都逐渐降低（逐渐变细），直到卵巢中的卵黄母细胞消失。在产卵季节结束时，没有卵母细胞卵母细胞大量闭锁，这是不确定生成器的非典型。我们建议减少卵母细胞募集和繁殖力是对上游产卵迁移的高能量支出的一种适应。