Gonad maturity stages of Metridia gerlachei in the Southern Ocean

Gonad maturation stages were separated modified after Runge (1985). One new stage (Gonad stage, semi-spent) with spent oviducts still containing a few eggs in some unarranged...性腺成熟分期体系基于朗格（Runge, 1985）的研究进行了划分与改进。本次研究新增了一个全新分期——半产卵期性腺阶段（Gonad stage, semi-spent），该阶段的产卵后输卵管内仍残留少量未规整排布的卵……