강도다리(Platichthys stellatus)의 치어의 섭식, 성장 및 흑화 발현에 있어 온도와 밀도의 영향
Influences of Temperature and Density on the Feeding Growth, and Blind-side Malpigmentation of Fry Starry Flounder Platichthys stellatus
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To examine the influences of water temperature and stocking density on feeding, growth and blind-side hypermelanosisof the starry flounder Platichthys stellatus, we performed an experiment with fry at two densities: 2 and 8 fish/LThe fry had a total length of 3.2±0.1 cm, body weight [BW] 0.6±0.1 g, and pigmented patches (pigmented ratio2.6±0.4 %) on the blind side . Duplicate experiments were conducted in 93.7 L glass tanks for 120 days, from Julyto November. We determined daily food intake (DFI), food efficiency (FE), growth, survival rate, ratio of hypermelanicfish, and pigmented area rate on the blind side at 60-day intervals. The DFI was less than 50 mg/fish/day, andgrowth was delayed from July to September (water temperature [WT]> 20℃). After October, when WT < 20℃, theDFI increased significantly and the growth was accelerated, suggesting that the rearing temperature of starry flounderin artificial facilities should be < 20℃. While the FE, and survival did no differ between the two density groups, DFIand growth were significantly higher at 2 fish/L than at 8 fish/L. There was no difference in the pigmented area ratiobetween the two density groups. Although the hypermelanosis was not correlated with body size, the malpigmentationincreased with growth. These results suggest that a high stocking density is not the main cause of blind-sidehypermelanosis, although it can accelerate hypermelanosis in the starry flounder.
Abstract
To examine the influences of water temperature and stocking density on feeding, growth and blind-side hypermelanosisof the starry flounder Platichthys stellatus, we performed an experiment with fry at two densities: 2 and 8 fish/LThe fry had a total length of 3.2±0.1 cm, body weight [BW] 0.6±0.1 g, and pigmented patches (pigmented ratio2.6±0.4 %) on the blind side . Duplicate experiments were conducted in 93.7 L glass tanks for 120 days, from Julyto November. We determined daily food intake (DFI), food efficiency (FE), growth, survival rate, ratio of hypermelanicfish, and pigmented area rate on the blind side at 60-day intervals. The DFI was less than 50 mg/fish/day, andgrowth was delayed from July to September (water temperature [WT]> 20℃). After October, when WT < 20℃, theDFI increased significantly and the growth was accelerated, suggesting that the rearing temperature of starry flounderin artificial facilities should be < 20℃. While the FE, and survival did no differ between the two density groups, DFIand growth were significantly higher at 2 fish/L than at 8 fish/L. There was no difference in the pigmented area ratiobetween the two density groups. Although the hypermelanosis was not correlated with body size, the malpigmentationincreased with growth. These results suggest that a high stocking density is not the main cause of blind-sidehypermelanosis, although it can accelerate hypermelanosis in the starry flounder.
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