东海细点圆趾蟹繁殖生物学的初步研究

Reproductive Biology of Ovalipes punctatus in the East China Sea

根据2010-2011年在东海渔业生产采集的细点圆趾蟹样品,结合实验室养殖,开展了对其繁殖生物学的研究。结果表明:东海细点圆趾蟹交配时,以硬壳雄蟹与软壳雌蟹的配对组合较为常见。最小抱卵个体头胸甲甲长为32.15 mm,甲宽为55.50 mm,体重为45.46 g。大部分抱卵个体的甲宽为60～75 mm。当甲宽为55.50～80.12 mm时,抱卵个体的抱卵量为(20.34～68.09)万,细点圆趾蟹的繁殖力随着雌性亲体规格的增大而增加。细点圆趾蟹的个体绝对繁殖力与甲宽的关系为:F=0.79 L3.10(2R2=0.998)。相同规格的雌性亲体,抱卵量比成熟卵母细胞数量少,这表明在产卵与孵化过程中有卵子损失。

Based on the samples of Ovalipes punctatus collected from fisheries resource survey in the East China Sea from 2010 to 2011, we reported the reproductive biological characteristics of O. punctatus. Copulation and batch fecundity and oocyte number were examined. Pair formation usually occurred between hard males and soft-shelled females. The body weight of the smallest brood crab was 45.46 g with its carapace length and width being 32.15 and 55.50 mm, respectively. Most of brood crab had the carapace width 60 to75 mm. Batch fecundity increased with increasing female body size and predicted estimates ranged between 0.234 and 0.680 9 million for CW of 55.50 to 80.12 mm. Fecundity（F） was related to carapace width（L） by the equation： F=0.79 L3102（R2=0.998）. Number of eggs being less than the oocyte number for females of the same size, it is suggested that egg loss occurred from oviposition to hatching.