- 期刊
Reproductive Biology of the Needlefish Tylosurus acus melanotus in Waters around Hsiao-Liu-Chiu Island, Southwestern Taiwan
並列摘要
In this study, we investigated the reproductive biology of the needlefish Tylosurus acus melanotus in waters of Hsiao-Liu-Chiu off southwestern Taiwan. In total, 658 specimens (329 females and 329 males) were collected monthly from driftnet catches in July 2008-Aug. 2009. Relationships between the eye fork length (EFL) and body weight (BW) did not significantly differ between sexes. Oocyte development was categorized into 8 stages based on histological examinations. The spawning season extended from Apr. to Aug. based on the macroscopic appearance of the gonads, a histological examination of the ovaries, estimations of the gonadosomatic index, and the frequency of oocyte diameters. Sizes at 50% maturity were respectively estimated to be 56.8 and 53.3 cm in EFL for females and males. The sex ratio did not significantly differ from 0.5 according to a Chi-squared test (p＞0.05). The mean fecundity of this species was estimated to be 25,629±6902 eggs. The batch fecundity was estimated to be in the range of 1062-24,576 eggs with a mean of 5748±4670 eggs.
延伸閱讀
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