Reproductive Biology of Yeilowfin Tuna T. albacares in the West-Central Indian Ocean

Survey of yellowfin tuna in the west-central Indian Ocean was conducted on board of Chinese Iongliners during 2003, 2004 and 2005, which is a part of Chinese Tuna Fishery Scientific Observer Program (CTFSOP). The reproductive biology has been investigated. A total of 1023 samples are collected including 417 ovaries and 606 testes. Spawning activities of yellowfin tuna have been studied for both male and female from January to June. The data showed that the average monthly sex ratio is 0.59, and the minimum length at sexual maturity is 101 cm for female and 110 cm for male respectively. Length at 50% sexual maturity is esti- mated at 113.77 cm for female and 120.20 cm for male, whereas maturation rate is 0.066 cm-1 for female and 0.091 cm-1 for male. Sex ratio by length class indicates that the proportion of male is higher than female's along with size increasing; for instance, in the group of the body length longer than 145 cm, some females have their body length from 145 to 160 cm and males have their body length at 160 cm and even longer. Statistically, yellowfin tuna has a significant seasonal reproduction.

作 者： ZHU Guoping XU Liuxiong ZHOU Yingqi SONG Liming   作者單位： ZHU Guoping,XU Liuxiong(College of Marine Science and Technology, Shanghai Ocean University, Shanghai 200090, P. R. China;The Key Laboratory of Oceanic Fisheries Resources Exploitation of Shanghai Education Commission, Shanghai 200090, P. R. China)

ZHOU Yingqi,SONG Liming(College of Marine Science and Technology, Shanghai Ocean University, Shanghai 200090, P. R. China) 

刊 名： 中國海洋大學學報（英文版）  ISTIC 英文刊名： JOURNAL OF OCEAN UNIVERSITY OF CHINA  年，卷(期)： 2008 7(3)  分類號： P7  關鍵詞： reproductive biology   yellowfin tuna   T. albacares   west-central Indian Ocean   sex ratio  

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