The Korean Journal of Malacology (한국패류학회지)

The Malacological Society of Korea (한국패류학회)
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The Effect of Water Temperature and Salinity on Settlement of Pacific Oyster, Crassostrea gigas Pediveliger Larvae

굴 Crassostrea gigas 부착기 유생의 부착에 미치는 수온 및 염분의 영향

  • 전창영 (국립수산과학원 남동해수산연구소) ;
  • 허영백 (국립수산과학원 남동해수산연구소) ;
  • 조기채 (국립수산과학원 남동해수산연구소)
  • Received : 2012.03.06
  • Accepted : 2012.03.19
  • Published : 2012.03.31
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Abstract

The combined effects of water temperature and salinity on the settlement rate and density (spats/$cm^2$) of Crassostrea gigas pediveliger larvae were studied under the hatchery conditions. Four water temperatures (20.0, 23.0, 26.0 and $29.0^{\circ}C$) were tested at three salinities (20.0, 30.0 and 40.0). The optimum water temperature by salinity conditions were $29.0^{\circ}C$ and 20.0, 30.0 which significantly (P < 0.05) the highest mean (${\pm}S.D$) larval settlement rate of $43.1{\pm}0.1%$, $42.1{\pm}0.1%$, respectively. But the combination of water temperatures and salinities for settlement density was not effected, but each factor as water temperature ($29.0^{\circ}C$), salinity (40.0) was shown significantly high and low settlement density, respectively (P < 0.05). The statistics result of settlement density frequency was appeared: mode ($1.2-2.3spats/cm^2$), Mean ($1.9-2.4spats/cm^2$), Range ($3.0-5.8spats/cm^2$) and the lowest variance was obtained 0.4 at water temperature $20.0^{\circ}C$ by salinity 30.0, but $29.0^{\circ}C$ by 20.0 was the highest (1.1). The best condition at this results for the larvae setting under the artificial seed collection of C. gigas was $29.0^{\circ}C$ and 20.0-30.0.

채묘시험은 4구간의 수온구 20.0, 23.0, 26.0, $29.0^{\circ}C$에 염분을 20.0, 30.0, 40.0으로 조절하여 온도와 염분의 혼합구에 대한 참굴 부착기 유생의 채묘시험을 실시한 결과, 수온 $29.0^{\circ}C$에서 염분 20.0과 30.0으로 조절된 채묘구에서 평균 $43.1{\pm}0.19%$와 $42.1{\pm}0.1%$로 유의적으로 가장 높은 채묘율을 보였고, 수온 $23.0^{\circ}C$염분 40.0에서 $34.9{\pm}0.6%$ 가장 낮은 부착률을 보였다 (P < 0.05). 부착밀도는 수온 $29.0^{\circ}C$에서 유의적으로 높았고, 염분 40.0의 고염분에서 유의적으로 낮았다(P < 0.05). 그러나 수온과 염분의 혼합효과는 유의적인 차이가 없었다 (P > 0.05). 수온에 따른 염분별 채묘구의 부착 빈도를 조사한 결과 가장 많은 부착빈도는 1.2-2.3 마리/$cm^2$을 보였고, 평균 부착밀도는 1.9-2.4마리/$cm^2$였다. 전체적으로 채묘율과 평균 부착밀도 그리고 부착빈도를 감안하면 본 실험 결과 효과적인 채묘관리를 위한 수온과 염분조건은 수온 $29.0^{\circ}C$, 염분 20.0-30.0으로 조절하는 것이 좋을 것으로 판단된다.

Keywords

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