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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/25105

Title: Reproductive biology of the blue sprat Spratelloides gracilis in the waters around Penghu, Central Taiwan Strait
Authors: Jinn-Sheng Weng;Kwang-Ming Liu;Sin-Che Lee;Wann-Sheng Tsai
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: Spratelloides gracilis;Blue sprat;Reproductive biology;Southwestern Taiwan
Date: 2005
Issue Date: 2011-10-20T08:21:18Z
Publisher: Zoological Studies
Abstract: abstract:The reproductive biology of the blue sprat, Spratelloides gracilis, is described based on 7737 specimens collected from Mar. 2001 to Feb. 2003 in the waters off Penghu (the Pescadores), off the southwestern coast of Taiwan in the central Taiwan Strait. The spawning season was estimated to be from Feb. to Sept. based on progressive changes in the size of the ovaries, histological examination of the ovaries, oocyte diameter measurements, and gonadosomatic index calculations. The body weight (BW)-fork length (FL) relationship was estimated to be BW = 6.06 x 10 -6 FL 3.087 for both sexes combined (n = 4042, p < 0.05). Eight stages of oocyte development were determined based on the histological examination. Ovarian development could be divided into immature, maturing, mature, and spent stages. Mean fecundity of this species was 2606 ± 1678
eggs, and mean batch fecundity was 1204 ± 714 eggs. The sex ratio (0.45) significantly differed from 0.5 (p < 0.05). Relationships of fecundity (F) and batch fecundity (BF) with fork length (FL) were estimated to be F = 0.0002 FL 3.841 (r 2 = 0.58, n = 62, p < 0.05) and BF = 0.001 FL 3.806
(r 2 = 0.82, n = 60, p < 0.05), respectively. Size at 1st maturity for females estimated from the logistic model was 54 mm FL, which corresponded to an age of 120 d old.
Relation: 44(4), pp.475-486
URI: http://ntour.ntou.edu.tw/handle/987654321/25105
Appears in Collections:[海洋事務與資源管理研究所] 期刊論文

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