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Title: Variation in life-history traits for micro-cohorts of Sepioteuthis lessoniana in the waters off northern Taiwan
Authors: Chih-Shin Chen
Jing-Yu Chen
Chiao-Wen Lin
Contributors: 國立臺灣海洋大學:海洋事務與資源管理研究所
Keywords: Northwest Pacific
Sepioteuthis lessoniana
Neritic squid
Date: 2015-01
Issue Date: 2017-02-07T05:44:49Z
Publisher: Fisheries Science
Abstract: Abstract: The bigfin reef squid Sepioteuthis lessoniana is a neritic squid widely distributed in the Indo-Pacific region and of interest to fisheries for its high commercial value. The age and growth of this squid has been studied along its distribution range, from Japan to Australia; however, the life-history parameters of this squid around Taiwan are unclear. In this study, growth and maturation of S. lessoniana in the waters off northern Taiwan between April 2009 and March 2010 was studied using statolith microstructure analysis. Statoliths of 142 females (88–355 mm mantle length, ML) and 129 males (85–401 mm ML) were read. The oldest female was mature at 216 days (355 mm ML), whereas the oldest male was mature at 209 days (345 mm ML). The squids hatch almost year-round, except in January and February, peaking in May and August–September. The ML-at-age data were best described by Schnute and linear functions for the females and males, respectively. The males attained a higher size-at-age than the females. Maturity ogives by age and ML class indicated that females mature later and at a larger size than males. Growth and maturation parameters of seasonal cohorts showed little difference, although squids hatching in warmer seasons tend to have a faster growth rate and higher size-at-age than those hatching in colder seasons for both sexes. The differences of life-history traits between seasonal cohorts could be inferred by progressive changes in the life-history traits of the squids hatching during transitional months, i.e. months between two peak seasons. These results provide essential life-history traits and improve our understanding of S. lessoniana populations in the waters off northern Taiwan.
Relation: 81(1)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40899
Appears in Collections:[海洋事務與資源管理研究所] 期刊論文

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