Occurrence and Survival Rate of the Larvae of Sea Mussel, Mytilus edulis

담치 종묘생산기술개발에 관한 연구 -진주담치 Mytilus edulis 부유유생의 출현과 생존율

In order to set up a predictive model for effective spat collection of sea mussel Mytilus edulis , the survival rate and time required at each developmental stage of drifting larvae were surveyed during the period from March 14 to July 20 in 1987 at the Naesan Ri, Jinhae Bay, the southern part of Korea. The advent of D - shape larvae ca. $120\times90um$ um long had three peaks in that area: April 15, May 13 and June 7. Umbo shape larvae ca.$188\times162{\mu}m$ and full grown larvae ca. $289\times280{\mu}m$ long also showed three peaks: April 27. May 24 and June 20 for the former, and May 10, June 5 and June 30 for the latter. Eleven to thirteen days were required for D - shape larvae to develop to umbo - shape larvae. The instantaneous death rate was 0.1300 and the daily survival rate 0.8781 at this intermorphological stage. The turnover time of umbo to full grown larvae varied from ten to thirteen days with a instantaneous death rate of 0.1520, daily survival rate of 0.8590, and mean survival rate of $16.89\%$. Twenty - three to twenty - five days were required for each group of the D - shape larvae to reach a full grown stage, and their mean survival rate was $3.55\%$ during this developmental period.

진해만내의 진동 고현 연안에서 진주 담치의 효율적인 종묘생산 기술 개발을 위하여 부유유생의 출현시각와 각 유생 단계별 생존율을 조사한 결과는 다음과 같다. 1. 진주 담치의 산란성기는 4월 중순경 이었다. 2. D형 유생으로부터 umbo형 유생까지는 11-13 일이 소요되었으며 umbo형 유생에서 성숙 유생까지는 10-13일이 소요 되었다. 그리고 D형 유생에서부터 채묘의 대상이 되는 성숙 유생까지는 23-25일이 소요되었다. 3. D형 유생에서 umbo형 유생으로 성장할 때까지의 평균 존재율은 $21.04\%$, umbo형 유생에서 성숙 유생까지는 $16.89\%$였고, D형유생의 $3.55\%$ 만이 성숙 유생으로 생존하였다. 4. 진해만산 진주 담치의 채묘적기는 5월 중순경이라고 판단된다.