Spatial variation in the annual reproductive cycle of Turbo (Batillus) cornutus (Gastropoda: Trochidae) at Jeju Island,Korea |
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| Authors: | Jee-Youn Lee Hyun-Sung Yang Do-Hyung Kang Hee-Do Jeung Hyun-Ki Hong Hee-Jung Lee |
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| Affiliation: | 1. School of Marine Biomedical Sciences (POST BK21) and Marine and Environmental Research Institute, Jeju National University, 66 Jejudaehakno, Jeju, 690-756, Republic of Korea.;2. East Sea Environment Research Division, East Sea Research Institute, Korea Institute of Ocean Science and Technology (KIOST), Uljin, Republic of Korea.;3. Marine Ecosystem Research Division, Ocean Science Research Department, Korea Institute of Ocean Science and Technology (KIOST), Ansan, Republic of Korea. |
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| Abstract: | The annual reproductive cycle of the top shell Turbo cornutus from Jeju Island was investigated in two populations using histology. In the northern population, gametogenesis commenced in January as the surface water temperature reached 14?°C, while in the southern population gametogenesis began a month earlier, as the water temperature remained at 17?°C. Ripe top shells first appeared in June and spawning continued from June to October when water temperatures were between 20 and 24?°C. Histology indicated that the spawning period of the southern population was a month earlier and lasted longer (June–October) than in the northern population (July–September). The percentage gonad area of animals in the southern population in March and April was significantly higher than in the northern population (p?
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| Keywords: | Gastropoda gametogenesis spawning condition index broodstock management |
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