National Taiwan Ocean University Institutional Repository:Item 987654321/25340
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题名: Reproductive biology of the bigeye thresher shark,Alopias superciliosus (Lowe, 1839) (Chondrichthyes: Alopiidae), in the northwestern Pacific
作者: Che-Tsung Chen;Kwang-Ming Liu;Yung-Chou Chang
贡献者: NTOU:Institute of Marine Affairs and Resource Managemen
关键词: Reproduction;Alopias superciliosus;oophagy;embryonic development;Elasmobranch
日期: 1997-06-01
上传时间: 2011-10-20T08:22:19Z
出版者: Ichthyological Research
摘要: abstract:Reproductive aspects ofAlopias superciliosus in the northwestern Pacific were described in detail, on the basis of 629 specimens (429 females and 200 males) collected from January 1984 to October 1984 and from October 1992 to March 1994.Alopias superciliosus embryos are oophagous. Six developmental stages (3 encapsulative and 3 posthatching) based on embryonic morphology and source of nutrition were recognized. The species bears 2 embryos per litter, their size at birth being between 135 and 140 cm TL. The sex ratio of embryos was 1∶1. Total length of females at maturity was 332–341. 1. cm; of males 270.1–287.6 cm. The gestation period could not be determined because most adult females were pregnant throughout the year. The typical reproductive strategy ofA. superciliosus is the production of a few large embryos per litter, with no fixed mating or birthing season.
關聯: 43(2-3), pp.227-235
显示于类别:[海洋事務與資源管理研究所] 期刊論文


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