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Ichthyological Research

, Volume 61, Issue 4, pp 322–331 | Cite as

Age, growth, and reproductive biology of blacktail snapper, Lutjanus fulvus, around the Yaeyama Islands, Okinawa, Japan

  • Tamaki ShimoseEmail author
  • Atsushi Nanami
Full Paper

Abstract

Age, growth, and reproductive characteristics of blacktail snapper, Lutjanus fulvus, which is a commercial fish species, were investigated using 322 specimens (40–332 mm in fork length) caught around the Yaeyama Islands, Okinawa, Japan. Spawning season was estimated to be from April to October, and spawning was confirmed around the full moon and the last quarter moon. Age determination using sectioned otoliths revealed that ages ranged from 0 to 34 years and the majority was ≥ 3 years. Parameters of the von Bertalanffy growth function were estimated to be L  = 270 mm, k = 0.40, and t 0  = −0.48 years for females, and 257 mm, 0.44, and −0.42 years for males. Initial growth was rapid during the first 3 years, attaining over 200 mm for both sexes, and then females grew larger than males. Sizes (ages) at the first sexual maturity were 225 mm (4 years) for females and 207 mm (3 years) for males. The wide range of age composition in catch with majority of ≥3 years old implied that the current fishing effort to harvest was not sufficiently large enough to collapse the stock immediately.

Keywords

Age Blacktail snapper Growth Lunar spawning Reproduction 

Notes

Acknowledgments

The authors thank the Yaeyama Fisheries Cooperatives and Sakihara Sashimi Store for help with sample collection at the fish market, Y. Akita (Okinawa Prefectural Fisheries Research and Extension Center) and K. Yokoyama (Okinawa Churaumi Aquarium) for providing useful information, the staff of Research Center for Subtropical Fisheries for help with sample treatment and comments on this study, and the anonymous reviewers for critical review of this manuscript. The present study complies with the current laws of Japan.

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Copyright information

© The Ichthyological Society of Japan 2014

Authors and Affiliations

  1. 1.Research Center for Subtropical Fisheries, Seikai National Fisheries Research InstituteFisheries Research AgencyIshigakiJapan

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