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KMID : 0894520070110030155
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Development & Reproduction
2007 Volume.11 No. 3 p.155 ~ p.165
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Reproductive Ecology of Neptunea (Barbitonia) arthritica cumingii
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Kim Yeon-Ho
Chung Ee-Yung
Shin Moon-Seup
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Abstract
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Gonad index (GI), conditon index, the reproductive cycle with gonadal development of the Neptunea (Barbitonia) arthritica cumingii, were investigated histologically, based on the samples which have been collected from the subtidal zone of Oeyeondo, Boryeong, Korea from January to December, 2006. Neptunea (Barbitonia) arthritica cumingii is dioecious and oviparous. Monthly changes in the gonad index (GI), studied for determination of spawning period, were closely associated with gonad developmental phases. The GI reached a maximum in April, and gradually decreased from May to August due to spawning. The gonadsomatic index and condition index showed similar patterns to gonad developmental phases and the spawning period. The reproductive cycle according to gonad developmental phases of this species can be classified into five successive stages in females and males: in females, early active stage (September to October), late active stage (November to February), ripe stage (February to June), partially spawned stage (May to August) and recovery stage (June to August); in males, the early active stage (September to October), late active stage (November to February), ripe stage (February to June), copulation (April to July), and recovery stage (July to August). Spawning occurred between May to August in females and April to July in males, and spawning peak in females was observed between June and July when the seawater temperature rose to above 19℃.
Percentages of first sexual maturity of female and male snails ranging from 50.1～60.0 ㎜ in shell height were over 50%, and 100% for snails over 60.1 ㎜ in shell height. The sex ratios of females to males were not significantly different from a 1:1 sex ratio.
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KEYWORD
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Neptunea (Barbitonia) arthritica cumingii, Reproductive cycle, First sexual maturity, Sex ratio
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