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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/32317

Title: Reproductive biology of Japanese butterfish Psenopsis anomala (Stromateidae) from coastal waters of northeastern Taiwan
Authors: S.B. Wang;C.T. Chen
Contributors: NTOU:Institute of Marine Affairs and Resource Managemen
國立臺灣海洋大學:海洋事務與資源管理研究所
Keywords: Psenopsis anomala;Reproduction
Date: 1995-05
Issue Date: 2012-06-15T07:49:49Z
Publisher: Fisheries Research
Abstract: abstract:The reproductive biology of Psenopsis anomala was examined from semimonthly trawl samples collected in northeastern Taiwan. Male P. anomala matured at 157 mm fork length (FL) and females were mature at 168 mm FL. Sex ratio of P. anomala was skewed toward females during the spawning season but was dominated by males in non-spawning seasons. Females also dominated the large size classes. The spawning season of P. anomala began in March and lasted for about 6 months (to August). P. anomala decreased in body condition before and during spawning, then increased in condition after spawning, and reached peak condition in early winter (December). The hepatosomatic index increased during late winter (February), peaked in May prior to peak spawning in June–August and decreased to its lowest value immediately after spawning. The patterns indicate that P. anomala reduced feeding activity and used reserved energy in muscle and liver for spawning. The fecundity of P. anomala ranged from 43 to 155 thousand eggs, with a mean of 80 thousand eggs. Batch fecundity ranged from 25 to 62 thousand eggs, which is 31–46% of total fecundity. P. anomala in northeastern Taiwan matured at a smaller size, were more fecund and exhibited an earlier and more protracted spawning season than those found off Japan and in the East China Sea. Geographical variations in reproductive biology suggest that P. anomala is able to adjust phenotypic response to environmental conditions that vary with latitude.
Relation: 23(1-2), pp.127-141
URI: http://ntour.ntou.edu.tw/handle/987654321/32317
Appears in Collections:[海洋事務與資源管理研究所] 期刊論文

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