ヒラメ稚魚の無眼側の体色異常に及ぼす飼育密度と飼餌料の影響

概要

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The influence of stocking density and food on hypermelanosis on the blind body side was investigated at the final phase of larval period in Japanese flounder Paralichthys olivaceus. Four stocking densities, 1, 000, 5, 000, 10, 000, and 30, 000 fish/m3 and two types of food, commercially produced artificial diet and Artemia nauplii, were tested. 27 days-old larvae (11.5mm in total length) accommodated in the 100l experimental tanks were reared under the above density and food conditions until age 42 days (about 20mm TL). Pigmentations on the blind and ocular body sides of harvested juveniles were classified into 4 types of coloration. Higher stocking density and the artificial diet reduced the occurrence of normally colored fish (% NC) on the blind side. Stocking densities appeared to have no effect on % NC on the ocular side, while feeding of Artemia nauplii resulted in a lower % NC. These results suggest that current methods of mass-production of seedling should be improved to prevent hypermelanosis of the blind body side in Japanese flounder.
公益社団法人日本水産学会の論文