Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Influence of Water Temperature, Background Color, and Light Intensity in Feeding, Growth and Blind-Side Hypermelanosis of Starry Flounder, Platichthys stellatus

강도다리, Platichthys stellatus의 먹이섭식, 성장 및 무안측 체색발현에 있어 수온, 수조색상 및 조도의 영향

  • Kang, Duk-Young (West Sea Fisheries Research Institute, National Fisheries Research Development Institute) ;
  • Kim, Won-Jin (Department Marine Bio-Materials & Aquaculture, Pukyoung National University) ;
  • Kim, Hyo-Chan (West Sea Fisheries Research Institute, National Fisheries Research Development Institute) ;
  • Chang, Young Jin (Department Marine Bio-Materials & Aquaculture, Pukyoung National University)
  • 강덕영 (국립수산과학원 서해수산연구소) ;
  • 김원진 (부경대학교 해양바이오신소재학과) ;
  • 김효찬 (국립수산과학원 서해수산연구소) ;
  • 장영진 (부경대학교 해양바이오신소재학과)
  • Received : 2014.06.06
  • Accepted : 2014.09.11
  • Published : 2014.09.30
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Abstract

To find the influence of water temperature, tank color and illumination in feeding, growth and blind-side hypermelanosis of starry flounder, Platichthys stellatus, in the present study, we performed a series of temperature, background color and illumination intensity test for 180 days (From June to December). The test was done in duplicate at 100 fish/tank (430% of initial covering area [PCA]) with the selected ordinary juvenile flounder (TL $17.3{\pm}0.5cm$, BW $82.5{\pm}0.2g$). The rearing was performed in darkgreen FRP aquarium tanks ($H100cm{\times}L100cm{\times}W100cm$; bottom area $1m^2$) lighten with average 1,000 lux and 230 lux, and in white FRP aquarium tank ($H100cm{\times}L100cm{\times}W100cm$; bottom area $1m^2$) lighten with average 230 lux of light intensity. We investigated correlation of daily food intake (DFI) with water temperature and salinity, and compared the influences of background colors and light intensity in DFI, food efficiency (FE), growth, survival rate, and ratio of malpigmented blind-side area and ambicolored fish ratio. In DFI, although it was not related with salinity, the amount was significantly decreased under 0.5 g/fish/day in summer and winter season, but was significantly increased over 1.5 g/fish/day in autumn season showing from $10^{\circ}C$ to $20^{\circ}C$ in water temperature. In background and illumination test, DFI, FE and survival rate showed no difference among three groups. The ratios of malpigmented blind-side area and ambicolored fish were also not significantly different among three groups, indicating that the blind-side hypermelanosis of starry may be governed not by background color (or light intensity) but by a genetics external trait inherited from parents.

강도다리, Platichthys stellatus의 먹이섭식, 성장 및 무안측 흑화에 있어 수온, 수조색상 및 조도의 영향을 파악하기 위해, 본 연구에서는 전장(TL) $17.3{\pm}0.5cm$ 및 체중(BW) $82.5{\pm}0.2g$의 양성어 중 정상 개체만을 선별하여, 6월에서 12월까지 180일 동안 환경 조건별 실험을 실시하였다. 실험은 국방색과 흰색수조($H100cm{\times}L100cm{\times}W100cm$; bottom area $1m^2$)를 이용하여 평균 조도 230 lux와 1,000 lux에서 2반복으로 실시하였다. 이 때 실험 밀도는 100마리/수조(430% of initial covering area [PCA])였다. 본 실험에서는 실험 기간동안, 수온 및 염분과 일간먹이섭식량(DFI)의 상관관계를 조사하였고, DFI, 먹이효율(FE), 성장, 생존율, 무안측 흑화률 및 흑화개체 비율을 실험구별로 비교하였다. DFI는 염분과의 상관관계는 보이지 않았지만, 겨울과 여름철 0.5 g/fish/day까지 유의하게 감소하고, 반대로 수온 $10{\sim}20^{\circ}C$인 가을에 1.5 g/fish/day 이상 증가하는 경향을 보였다. 이러한 결과는 강도다리 양식은 수온 $10{\sim}20^{\circ}C$에서 이루어져야 함을 내포하고 있다. 또한 DFI, FE 및 생존율은 배경색상과 조도의 영향을 받지 않았다. 또한 가자미류의 무안측 흑화 발현 인자로 알려진 200% PCA 이상의 높은 밀도, 어두운 배경색상과 과도하게 밝은 조도가 강도다리에게 아무런 영향을 미치지 않았다.

Keywords

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