The Korean Journal of Malacology (한국패류학회지)

The Malacological Society of Korea (한국패류학회)
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Optimum Culture Condition on Four Species of Microalgae used as Live Food for Seedling Production of Bivalve

이매패류 먹이생물로 이용되는 미세조류 4종의 적정 배양환경조건

  • Min, Byeong-Hee (Busan Marine Fisheries Resources Research Institute) ;
  • Hur, Sung Bum (Department of Marine Bio-materials and Aquaculture, Pukyong National University)
  • 민병희 (부산광역시 수산자원연구소) ;
  • 허성범 (부경대학교 해양바이오신소재학과)
  • Received : 2015.03.10
  • Accepted : 2015.03.30
  • Published : 2015.03.31
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Abstract

In order to investigate the live food value of microalgae for efficacious rearing of larvae and spats of bivalve, we studied growth rates of four microalgal species (Isochrysis galbana, Pavlova lutheri, Chaetoceros simplex, Tetraselmis tetrathele) cultured in different environmental conditions. These include changes in temperatures (20, 25, 30 and $35^{\circ}C$), salinities (20, 25, 30 and 33 psu) and light intensities (60, 100 and $140{\mu}mol\;m^{-2}s^{-1}$). The growth rate of I. galbana was faster at $25^{\circ}C$ than that of $20^{\circ}C$. At $25^{\circ}C$ the highest growth rate of I. galbana was observed at 33 psu (0.413) and the lowest at 20 psu (0.368) in 10 days of culture (P < 0.05). The growth rate of I. galbana was lower at 25 psu (0.383) than that of 30 psu and higher than that of 20 psu (P < 0.05). Similar temperature and salinity-dependent changes were also found in P. lutheri and T. tetrathele. C. simplex showed faster growth rate at $30^{\circ}C$ than that of $25^{\circ}C$. The highest growth rate of C. simplex was observed at 33 psu (0.428) and the lowest at 20 psu (0.389) in 10 days of culture (P < 0.05). Upon exposure to the light with different intensities, all four microalgal species showed a significantly faster growth rate at $140{\mu}mol\;m^{-2}s^{-1}$ than at $100{\mu}mol\;m^{-2}s^{-1}$ (P < 0.05).

실험에 사용된 미세조류는 이매패류 종묘생산시 유생과 치패의 먹이생물로 주로 이용되고 있는 Isochrysis galbana, Pavlova lutheri, Chaetoceros simplex, Tetraselmis tetrathele 등 4종을 선정하였으며, 배양환경으로 수온 (20, 25, 30, $35^{\circ}C$), 염분 (20, 25, 30, 33 psu) 그리고 조도 (60, 100, $140{\mu}mol\;m^{-2}s^{-1}$) 를 서로 달리하여 4종의 미세조류에 대한 성장을 조사하였다. I. galbana의 성장은 수온 $20^{\circ}C$ 보다 $25^{\circ}C$에서 빠른 성장을 나타내었으며, 수온 $25^{\circ}C$일 때 일간 성장률은 염분 33 psu에서 0.413으로 가장 높았고, 20 psu에서 0.368로 가장 낮게 나타났다 (P < 0.05). 25 psu에서 일간 성장률은 0.383으로 30 psu 보다 낮게 나타났고, 20 psu 보다 높은 경향을 보였다 (P < 0.05). 이와 같은 수온과 염분에 따른 미세조류의 성장률은 종별로 다소 차이는 있으나 P. lutheri, T. tetrathele에서도 I. galbana의 성장과 유사한 경향을 나타내었다. 한편, C. simplex의 성장은 수온 $25^{\circ}C$ 보다 $30^{\circ}C$에서 빠른 성장을 나타내었으며, 수온 $30^{\circ}C$에서 일간 성장률은 배양 10일째 염분 33 psu에서 0.428로 가장 높았고, 20 psu에서 0.389로 가장 낮게 나타났다 (P < 0.05). 그리고 서로 다른 조도에서 배양한 미세조류 4종의 성장은 $100{\mu}mol\;m^{-2}s^{-1}$ 보다 $140{\mu}mol\;m^{-2}s^{-1}$의 조도에서 가장 빠른 성장을 나타내었다 (P < 0.05).

Keywords

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