Influence of Water Temperature on Egg Development of Surf clam, Spisula sachalinensis

북방대합, Spisula sachazinensis의 난 발생에 미치는 수온의 영향

  • 이정용 (국립수산진흥원 강를수산종묘시험장) ;
  • 장윤정 (국립수산진흥원 강를수산종묘시험장) ;
  • 김영신 (국립수산진흥원 강를수산종묘시험장) ;
  • 최윤희 (국립수산진흥원 강를수산종묘시험장) ;
  • 장영진 (국립수산진흥원 강를수산종묘시험장)
  • Published : 2002.02.01

Abstract

Water temperature, at which Spisula sachdinensis egg successfully completed development ranges from 10 to $25^{\circ}C$. Within this range, the development duration is reduced with increasing temperature. The relationships between temperature (WT, $^{\circ}C$) and the required time (t: hour) from egg to each developmental stage are described as follows: 2-cell : 1/t = 0.0554 WT -0.3769; 8-cell : 1/t = 0.0210 WT -0.1142; Morula : 1/t = 0.0125WT -0.0712; Trochophore : 1/t = 0.0039 WT -0.0203; D-shaped larva : 1/t = 0.0024W T -0.0108. Biological minimum temperature for the egg development is 5.5$^{\circ}C$.

이 연구에서는 북방대합의 과학적이고 효율적인 인공종묘생산을 위한 기초지식을 얻고자 난 발생에 미치는 수온의 영향에 관하여 조사하였다. 북방대합의 발생 가능 수온은 10∼25$^{\circ}C$ 인 것으로 나타났으며, 북방대합이 초기D상 유생에 도달한 시간은 10, 15, 20, 25$^{\circ}C$에서 각각 70, 47, 27, 20시간이 소요되었다. 수온 (WT : $^{\circ}C$)과 각 발생 단계별 소요시간 (h : hour)의 관계식은 다음과 같다. 2세포기 : 1/t = 0.0554WT-0.3769 8 세포기 : 1/t : 0.0210WT-0.1142 상실기 : 1/t : 0.0125WT-0.0712 담륜자기 : 1/t = 0.0039WT-0.0203 D상 유생 : 1/t = 0.0024WT-0.0108 이들 관계식을 기초로 하여 북방대합의 초기 발생에 있어서 난 발생이 정지하는 생물학적 영도 (Biological minimum temperature)는 평균 5.5$^{\circ}C$로 산정되었다.

Keywords

References

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