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Title: Age, growth and reproduction of cutlassfishes Trichiurus spp. in the southern East China Sea
Authors: N.-T. Shih;K.-C. Hsu;I.-H. Ni
Contributors: 國立臺灣海洋大學:環境生物與漁業科學學系
Date: 2011-07
Issue Date: 2017-01-13T07:35:43Z
Publisher: Journal of Applied Ichthyology
Abstract: Abstract:The cutlassfish is one of the most commercially important continental fishes in the East China Sea. However, the current classification of cutlassfishes is suboptimal and complicates fisheries management. This study investigated the growth and reproduction of three cutlassfish species in the southern East China Sea. Between August 2002 and September 2003, a total of 2717 specimens of Trichiurus japonicus, T. sp.2 (likely synonymous for T. nanhaiensis) and T. lepturus were collected monthly from Daxi, Anping, Nanfangao, Donggang and Xingang fishing ports. The von Bertalanffy growth model in preanal length (PL) resulted in PL (mm) inline image for T. japonicus, PL(mm) inline image for T. sp.2 and PL (mm) inline image for T. lepturus. Their growths were significantly different between sexes for T. japonicus and T. sp.2 and among the three species. From macroscopic examination of ovaries, histological inspection of oocytes, and analyses of gonosomatic and hepatosomatic indices, T. japonicus was likely to spawn all year round, with two peaks in February–July and November–December. T. sp.2 spawned relatively later, between April and August. The length at sexual maturity of T. japonicus females was 264 mm PL or 746 mm total length. The sex ratios of T. japonicus and T. sp.2 were significantly different from 1 : 1 whereas T. lepturus showed no significant difference. The three species of trichiurids have different geographical distributions in this region.
Relation: 27(6), pp.1307-1315
Appears in Collections:[Department of Environmental Biology and Fisheries Science] Periodical Articles

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