초록

AI-Helper

남해안에 서식하는 왕우럭의 산란기를 파악하기 위하여 생식소 발달과정과 생식주기를 조사하였다. 생식소 성숙에 영향을 미치는 왕우럭 서식 수역의 월별 평균수온은 $4.9\~24.9^{\circ}C$ 였으며, 비중의 월별 변화는 1.0210$\~$1.0266이었다. 월별 비만도의 변화는 0.2381$\~$0.2827로 1월부터 서서히 높아져 4월에 0.2827로 최고값을 보였다가 6월까지 급격히 낮아진 후 다시 높아져 8월에 0.2812가 된 후 낮아졌다. 비만도는 각각 두 번의 정점을 나타냈으며, 이 정점에서 생식소도 최대로 발달하는 경향을 보였다. 월별 연체부중량비는 $38.0\%\~46.4\%$로 비만도의 월별 변화와 같은 경향이었다. 난모세포의 평균 직경은 4월이 36.7$\pm$13.2$\mu$m로 커졌으며, 이후 8월까지 점차 작아졌다가 9월부터 다시 커지기 시작하여 10월에 평균 43.5$\pm$10.3$\mu$m까지 증가하였다 생식소의 조직상, 비만도 및 월별 난경의 변화를 종합하여 본 남해안산 왕우럭의 생식주기는 분열증식기 12$\~$l월과 7$\~$8월, 성장기 1$\~$2월과 9$\~$10월, 성숙기 2$\~$4월과 9$\~$11월, 산란기 4$\~$6월과 9$\~$11월 및 퇴화 및 휴지기 5$\~$7월과 11$\~$1월이었다.

Abstract ▼ AI-Helper

Gametogenesis, reproductive cycle, condition factor, and meat weight rate of the surf clam, Tresus Keenae were studied by histological observations and morphometric data based on the samples which have been collected from the south coast of Korea, from January 1995 to February 1996. The annual range...

Gametogenesis, reproductive cycle, condition factor, and meat weight rate of the surf clam, Tresus Keenae were studied by histological observations and morphometric data based on the samples which have been collected from the south coast of Korea, from January 1995 to February 1996. The annual ranges of the mean seawater temperature and specific gravity in habitat of the surf clam were $4.9\~24.9^{\circ}C$ and 1.0210$\~$1.0266, respectively. Monthly changes in the condition factor showed in a wide range from 0.2381 to 0.2827, began to increase in January and reached the first maximum (0.2827) in April. And then the value rapidly decreased in June, thereafter, reached the second peak (0.2812) in August. The condition factor of this species showed the two peaks, and gonadal development reached sexually mature and ripe conditions during the period of these two peaks. The meat weight rate ranged from $38.0\%$ to $46.4\%$, and its change showed a similar tendency with the condition factor. The reproductive cycle of this species can be divided into five successive stages: in both sex, multiplicative (December to January, July to August), growing (January to February, September to October), mature (February to April, September to November), spawning (April to June, September to November), and degenerative and resting stage (May to July, November to January).

주제어