摘要
为了探求东海三疣梭子蟹成熟群体的发育生殖机制,采用生态学、资源生物学等相关研究方法,通过对三疣梭子蟹性腺、肝胰腺及条件指数等指标的研究,初步建立起雄性三疣梭子蟹成熟阶段发育分期的特征变化,反映了目前东海三疣梭子蟹成熟群体的生殖特征和条件状况。三疣梭子蟹生殖群体由1龄蟹为主,规格偏小。头胸甲宽主要分布在100-160 mm之间,体重为50-200 g。头胸甲宽与长呈线性相关,而头胸甲宽、长与体重则呈幂函数关系。成熟阶段输精管发育程度和头胸甲宽正显著相关。根据三疣梭子蟹输精管的粗糙程度、管径及管重大小,本文首次提出把处于成熟阶段的雄蟹分为5个阶段。输精管重增长为幂函数方式,输精管指数则随发育线性增长。雌蟹卵巢发育规律和头胸甲宽之间关系不甚明显,而和季节相关。研究表明,9月份三疣梭子蟹交配后卵巢迅速发育,增长明显,10-12月份生殖群体卵巢普遍处于Ⅱ-Ⅳ期。三疣梭子蟹肝胰腺重量随体重和甲壳的增长而增加,而肝体指数相反。雌蟹卵巢Ⅱ期阶段梭子蟹肝胰腺重量最高,平均重量为18.21±5.68 g,随后逐渐降低,说明肝胰腺能量发生了转移;相比于雄蟹,雌蟹储能更多。雌蟹卵巢重量随肝胰腺重量变化呈对数关系增长,而雄蟹输精管重随肝胰腺重呈线性。三疣梭子蟹生殖群体在发育变化过程中两个条件指数基本处于一个平衡阶段,雌雄间差异变化不大。
Abstract： To detect the reproductive mechanism of the stock of maturing swimming crab Portunus trituberculatus in East China Sea, methods of ecology and resource biology were used to do research on the change of gonad, heaptopancreas and other related condition factors. In this process, we preliminarily established regulations that could distinguish the adult male crab by examing the vas deferens thus reflectedreproductive conditions of the stock. The reproductive stock mainly consists of comparatively small one-year generation, their carapace width （CW） mainly between 100 - 160 mm; weight between 50 - 200 g. The carapace length （CL） is linear to CW, but weight shows power function relationship to both CL and CW. Positive relation between maturing vas deferens conditions and CW could be observed. Adult male crab was classified into five stages in terms of conditions of vas deferens （ superficial condition, diameter and weight）. With CW increasing, the weight of vas deferens shows power function relationship, but the index of vas deferens regression is linear. Conditions of the ovary were not obviously related with CW but with seasons. After copulation in September, the ovary matures rapidly with heavy weight increase. The stage of the ovary was common between H - 1V （ Oct - Dec）. Both in male and female, the hepatopancreas weight increased with the increase of CW and body weight. When the ovary was in stage H, the weight of hepatopancreas was the highest （18. 21 _＋ 5. 68 g）, then decreasing gradually, which indicates inter-energy transmission. Compared with male, female stored more energy. The regression of the weight of ovary and hepatopancreas shows logarithm relationship, but vas deferens linear. In the maturing course of the stock of P. trituberculatus, two condition factors, CF1 and CF2, showed no obvious differences between sexes, being in comparative identical conditions.
出处
《海洋渔业》
CSCD
北大核心
2009年第2期120-127,共8页
Marine Fisheries
基金
上海海洋大学校长基金项目(科04-97)
关键词
三疣梭子蟹
输精管
卵巢
肝胰腺
条件指数
Portunus trituberculatus
vas deferens
ovary
hepatopancrea
condition factor （CF）
