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首页> 外文期刊>Canadian Journal of Zoology >A technique for identifying the early-premolt stage in the male snow crab Chionoecetes opilio (Brachyura : Majidae) in Baie des Chaleurs, southern Gulf of St. Lawrence
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A technique for identifying the early-premolt stage in the male snow crab Chionoecetes opilio (Brachyura : Majidae) in Baie des Chaleurs, southern Gulf of St. Lawrence

机译：一种用于在圣劳伦斯湾南部的Baie des Chaleurs的雄性雪蟹Chionoecetes opilio（Brachyura：Majidae）上鉴定早期蜕皮阶段的技术

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摘要

New criteria for determining the early-premolt stage (D-0) of the snow crab Chionoecetes opilio are described, based on histological observations. Identifying the early-premolt stage in snow crabs on the basis of observations of setagenesis poses difficulties for inexperienced observers. At the start of the premolt phase, numerous actively secreting cells beneath the epithelium and Leydig cells in the connective tissue can be observed using histological techniques. A semitransparent substance observed between the membranous layer and epithelium by histological means was further subjected to transmission electron microscope observations, which suggested that this was the molting fluid whose presence represents the beginning of the process of deposition of the epicuticle. At the time when the molting fluid is secreted in snow crabs, no morphological characteristics of premolt stage D1 are discernible, therefore these features can be used to identify DO. Using this technique, the molt stages of adolescent male crabs in the southern Gulf of St. Lawrence were examined, revealing the existence of two different types of molters that enter into the molting process in different times of the year. The majority of adolescent males go through the premolt stages in August-December and start to molt in March-April of the following year; another group of adolescent males with more epibionts on the carapace in the spring (adolescents that did not molt in the previous spring) are in the premolt stages in May-July and probably start to molt in December-January. The present study reveals that the molting patterns of snow crabs are far more flexible than the previous literature had suggested. The implications for long-term stock management are quite important, and further study on the structure and dynamics of molters is needed. [References: 26]
机译：根据组织学观察结果，描述了确定雪蟹拟南芥早熟前阶段（D-0）的新标准。根据生化现象的鉴定来鉴定雪蟹的前蜕皮早期阶段，对于没有经验的观察者来说是困难的。在预蜕皮阶段开始时，可​​以使用组织学技术观察到结缔组织上皮下的大量活跃分泌细胞和莱迪格细胞。通过组织学方法在膜层和上皮之间观察到的半透明物质进一步经受透射电子显微镜观察，这表明这是蜕皮液，其存在代表表皮表皮沉积过程的开始。在雪蟹中分泌蜕皮液时，无法分辨出蜕皮前阶段D1的形态特征，因此这些特征可用于识别DO。使用这项技术，对圣劳伦斯湾南部的青春期雄性蟹的蜕皮阶段进行了检查，发现存在两种不同类型的蜕皮，它们在一年中的不同时间进入蜕皮过程。多数青春期男性在8月至12月经历蜕皮前期，并于次年3月至4月开始蜕皮。另一组在春季甲壳上有更多表皮虫的青春期男性（前一春季未蜕皮的青春期）在5月至7月处于蜕皮前期，可能在12月至1月开始蜕皮。本研究表明，雪蟹的蜕皮模式比以前的文献所建议的要灵活得多。长期存货管理的意义非常重要，需要进一步研究肉的结构和动力学。 [参考：26]

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