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Reproductive biology of yellowfin tuna T. albacares in the west-central Indian Ocean

Abstract

Survey of yellowfin tuna in the west-central Indian Ocean was conducted on board of Chinese longliners 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 1 023 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 estimated 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.

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Correspondence to Yingqi Zhou.

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Zhu, G., Xu, L., Zhou, Y. et al. Reproductive biology of yellowfin tuna T. albacares in the west-central Indian Ocean. J. Ocean Univ. China 7, 327–332 (2008). https://doi.org/10.1007/s11802-008-0327-3

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  • DOI: https://doi.org/10.1007/s11802-008-0327-3

Key words

  • reproductive biology
  • yellowfin tuna
  • T. albacares
  • west-central Indian Ocean
  • sex ratio