Morphology of unfertilized mature and fertilized developing marine pelagic eggs in four types of multiple spawning flounders
文献类型: 外文期刊
第一作者: Bian, Xiaodong
作者: Bian, Xiaodong;Zhang, Xiumei;Gao, Tianxiang;Wan, Ruijing;Chen, Siqing;Sakurai, Yasunari
作者机构:
关键词: Egg envelope;Flounders;Morphology;Multiple spawner;Ultrastructure
期刊名称:ICHTHYOLOGICAL RESEARCH ( 影响因子:1.105; 五年影响因子:1.203 )
ISSN: 1341-8998
年卷期: 2010 年 57 卷 4 期
页码:
收录情况: SCI
摘要: Starry flounder Platichthys stellatus, spotted halibut Verasper variegates, turbot Scophthalmus maximus, and Japanese flounder Paralichthys olivaceus are four commercially cultivated multiple spawning flounders that spawn pelagic eggs. Through appropriate light and scanning electron microscope processing, the shape and surface structures (such as micropyle, pores, pore density, and paten) of unfertilized mature and fertilized developing eggs of the four species were observed and measured. First, individual or intraspecific comparisons of the surface structures of eggs at different developmental stages were made. Second, interspecific differences among the four species at the same developmental stage of unfertilized mature eggs were statistically computed and analyzed through one-way analysis of variance and hierarchical cluster analysis. Eggs of the same species collected at different stages of development tend to be different in morphology. Smoothing of the convoluted egg envelope surface and closure of the micropyle to serve as a final step of the polyspermy-preventing reaction are common after fertilization. Based on detailed morphology of micropyle of just-mature fertilizable eggs, turbot, starry flounder, and Japanese flounder each have a micropyle with a long canal but no distinct micropylar vestibule, type III of Riehl and Gotting (Arch Hydrobiol 74:393-402, 1974). In contrast, spotted halibut has a micropyle with a distinct flat micropylar vestibule and a long canal, type II. Envelope surface microstructures, especially those in the micropyle region, are useful characters for egg identification among the four species. Cluster analysis using selected egg characters indicated the highest similarity between turbot and Japanese flounder and that starry flounder is obviously more similar to turbot and Japanese flounder than to spotted halibut.
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