Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Effects of Water Temperature and Salinity on Dietary Feeding of Manila clam (Ruditapes philippinarum)

바지락, Ruditapes philippinarum의 먹이 섭취에 미치는 수온과 염분의 영향

  • 김철원 (국립수산과학원 남해수산연구소 양식연구팀) ;
  • 고강희 (여수대학교 수산과학연구소)
  • Published : 2004.03.01
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Abstract

The feeding, clearance rate, and ingestion rate of Manila clam (Ruditapes philippinarum) were investigated with small group (10.8$\pm$.58 mm in shell length) and large group (37.5$\pm$3.8 mm in shell length) under combination in water temperature (24, 27, 33, $36^{\circ}C$) With salinity (12, 15, 24, 27$\textperthousand$). The maximum feeding, clearance rate, and ingestion rate in small and large groups were $27^{\circ}C$ and 27$\textperthousand$, respectively. While, The minimum feeding, clearance rate, and ingestion rate in both groups were $36^{\circ}C$ and 12$\textperthousand$, respectively. There results were suggested that the feeding, clearance rate, and ingestion rate of Manila clam were significantly influenced by external factors such as water temperature and salinity. The reason for the mass mortality of Manila clam during the heavy rainfall in summer season can be explained by high temperature and low salinity.

여름철 고수온기와 집중강우로 인하여 염분의 급격히 감소하는 시기에 바지락의 일간먹이밀도 감소량, 여수율, 소화율을 조사하였다. 실험결과 바지락은 수온과 염분에 의하여 일간먹이밀도 감소량, 여수율, 소화율이 영향을 받는 것으로 나타났다. 수온의 경우 소형그룹의 $27^{\circ}C$에서 각각 $5.8\times 10^4$ cells $ml^{-1}$, 16.96 liter $hr^{-1} \; g^{-1}$, $12.04\times 10^{7}$ cells $hr^{-1} \; g^{-1}$로 가장 높은값을 보였으며 대형그룹에서도 $27^{\circ}C$에서 각각 $15.60\times 10^4$ cells $ml^{-1}$, 11.85 liter $hr^{-1} \; g^{-1}$Cells $hr^{-1} \; g^{-1}$로 가장 높은 값을 보였다. 염분에 따른 소형그룹의 일간 먹이밀도 감소량, 여수율과 소화율은 12$\textperthousand$에서 $0.10\times 10^4$cells $ml^{-1}$, 0.19 liter $hr^{-1} \; g^{-1}$, $0.18\times 10^{7}$ cells $hr^{-1} \; g^{-1}$로 가장 낮은값을 보였으며 대형그룹에서도 12$\textperthousand$에서 $0.45\times 10^4$ Cells $ml^{-1}$, 0.24 liter $hr^{-1} \; g^{-1}$, 0.71${\times}$$10^{7}$ cells $hr^{-1} \; g^{-1}$로 가장 낮은값을 보였다. 본 실험결과 여름철 고수온과 저염분이 바지락의 대량폐사 원인으로 작용하며 안정적인 생산을 방해하는 요인임을 알수 있었다.

Keywords

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