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Age, growth, and reproductive characteristics of dolphinfish Coryphaena hippurus in the waters off west Kyushu, northern East China Sea |
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| Authors: | Seishiro Furukawa Seiji Ohshimo Seitaro Tomoe Tetsuro Shiraishi Naoyuki Nakatsuka Ryo Kawabe |
| Institution: | 1. Graduate School of Science and Technology, Nagasaki University, Bunkyo-machi, Nagasaki, 852-8521, Japan 2. Seikai National Fisheries Research Institute, Fisheries Research Agency, Taira-machi, Nagasaki, 851-2213, Japan 3. Japan Overseas Cooperation Volunteers, Japan International Cooperation Agency (JICA), Tokyo, Japan 6. Service D??partemental de P??che et de la Surveillance de Mbour, Mbour, Republic of Senegal 4. Okayama Fisheries Promotion Foundation, Urayasu-minami-machi, Okayama, 702-8024, Japan 5. Graduate School of Fisheries Science and Environmental Studies, Nagasaki University, Taira-machi, Nagasaki, 851-2213, Japan |
| Abstract: | The growth and reproductive characteristics of dolphinfish Coryphaena hippurus collected in the waters off western Kyushu from May 2008 to April 2011 were determined based on scale and otolith readings and gonad histological examinations, respectively. Based on annual increments in scales and daily increments in sagittal otoliths, the von Bertalanffy growth curves in male and females were determined as $ FL_{t} = 10491 - \exp \{ - 0.835(t + 6.975 \times 10^{ - 14} )\} ] $ and $ FL_{t} = 9381 - \exp \{ - 1.029(t + 6.975 \times 10^{ - 14} )\} ] $ , respectively, where FL t is the mean fork length (mm) at age t. The spawning period was found to last from June to August for dolphinfish, based on an examination of the monthly changes in the gonadosomatic index and histological observations. Therefore, based on the relationship between the fork length and the developmental stage of the testes or ovaries, male and female dolphinfish were found to reach sexual maturity by the following spawning season after hatching in the northern East China Sea. |
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