Reproductive activity in the checkered snapper, Lutjanus decussatus, off Ishigaki Island, Okinawa |
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Authors: | Atsushi Nanami Koichi Okuzawa Hideaki Yamada Nobuaki Suzuki Yoshimasa Aonuma |
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Affiliation: | (1) Ishigaki Tropical Station, Seikai National Fisheries Research Institute, Fukai-Ota 148-446, Ishigaki Okinawa, 907-0451, Japan |
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Abstract: | The checkered snapper, Lutjanus decussatus, is an important species for fisheries in the Okinawan region. This study estimated the reproduction of this lutjanid species in the waters around Ishigaki Island. The main spawning season was estimated to be between June and October, since oocytes at the maturation stage and/or postovulatory follicles were found during the study period. In the main spawning season, high gonadosomatic index values were found around the time of the last quarter moon for each month from June to September. It is suggested that L. decussatus is a lunar-synchronized spawner off Ishigaki Island. |
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