The Korean Journal of Malacology (한국패류학회지)

The Malacological Society of Korea (한국패류학회)
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Effect of Temperature on Induced Sexual Maturation of the Hard Clam, Meretrix petechiails (Lamarck) Broodstock

말백합, Meretrix petechiails (Lamarck) 어미의 사육수온에 따른 성 성숙 유도

  • Kim, Byoung-Hak (Shellfish Research Center, National Fisheries Research and Development Institute) ;
  • Moon, Tae-Seok (Shellfish Research Center, National Fisheries Research and Development Institute) ;
  • Park, Ki-Yeol (Shellfish Research Center, National Fisheries Research and Development Institute) ;
  • Jin, Young-Guk (South Sea Fisheries Research Institute, NFRDI) ;
  • Shin, Yun-Kyung (South Sea Fisheries Research Institute, NFRDI)
  • 김병학 (국립수산과학원 남해특성화연구센터) ;
  • 문태석 (국립수산과학원 남해특성화연구센터) ;
  • 박기열 (국립수산과학원 남해특성화연구센터) ;
  • 진영국 (국립수산과학원 남해수산연구소) ;
  • 신윤경 (국립수산과학원 남해수산연구소)
  • Received : 2009.05.13
  • Accepted : 2009.08.01
  • Published : 2009.08.31
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Abstract

Artificial induction of maturation by heating of the hard clam, Meretrix petechiails (Lamarck) broodstock was investigated from 25 May to 30 June in 2008. We experimented maturation by keeping the breeding water temperature at 20, 25 and $30^{\circ}C$ and as the natural water temperature and found the following results. In case of the female, maturation was the quickest in the experiment group of $30^{\circ}C$ and the maturation tended to be slower as the water temperature was lower. The similar trend was displayed among the male. At experiment completion, maturation induction rate was found to be the highest at 46.0% in the experiment group of $30^{\circ}C$ followed by 35.0% in the experiment group of $15^{\circ}C$, 18.0% in the experiment group of natural water temperature and 12.0% in the experiment group of $20^{\circ}C$. During the period of the experiment, the survival rate was of 90% or more in all groups.

본 연구는 2008년 3월 24일에 전남 영광군에서 채취한 말백합 어미 1,200 마리를 확보하여 수온조절 (20, 25, $30^{\circ}C$ 및 자연해수) 에 의한 인위적인 성 성숙을 유도하였으며, 성숙 유도된 어미로부터 생존율, 비만도, 생식소 및 성숙 소요일수를 조사하였다. 말백합 어미의 연체부지수는 사육초기에는 다소 낮아지는 경향이 있었으나, 5월 중순부터 증가하는 경향이 있었으며, 시험 종료 시에는 연체부 지수가 급격히 증가하였으며, 각부용적지수도 유사한 경향을 나타내었다. 말백합의 생식소 발달단계는 비활성기, 초기 활성기, 후기활성기, 완숙기, 방출 및 퇴화기의 5 단계로 구분할 수 있는데, 시험 개시일인 3월 25일경은 전기 활성기였으며, 시험 종료일인 6월 30일에는 수온별로 다양한 생식주기를 나타내었다. 시험 종료 시 성숙 유도율은 $30^{\circ}C$ 실험구에서 46.0%로 가장 높았고, $15^{\circ}C$ 실험구 35.0%, 자연수온 18.0% 및 $20^{\circ}C$ 실험구 12.0%로 순으로 나타났으며, 시험 기간 중 생존율은 전 구간이 90% 이상으로 나타났다. 사육수온을 20, 25, $30^{\circ}C$ 및 자연수온으로 성숙 시험한 결과, 암컷의 경우 $30^{\circ}C$ 실험구가 성숙이 가장 빨랐고, 수온이 낮을수록 늦은 경향이었으며, 수컷도 비슷한 경향을 나타내었다. 말백합의 수온별 어미성숙은 $20^{\circ}C$ 보다는 수온이 높은 실험구인 25, $30^{\circ}C$에서 성숙 유도율이 높게 나타났다.

Keywords

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