ヒラメ無眼側体色異常出現に及ぼす飼料中の脂溶性ビタミン強化の影響

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タイトル別名
  • Relationship between Fat Soluble Vitamins in Diet and the Occurrence of Colour Abnormality on the Blind Side of Juvenile Japanese Flounder.
  • ヒラメ ム ガンソク タイショク イジョウ シュツゲン ニ オヨボス シリョウ

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抄録

This experiment was conducted to clarify the relationship between fat soluble vitamins (vitamins A and D) in diet and the occurrence of colour abnormality on the blind side of juvenile Japanese flounder, Paralichthys olivaceus. Twenty days after hatching, fish were fed the experimental diets containing three different levels of vitamin A (0, 1, 500, and 9, 000 IU/100g) in addition to 20, 000 IU vitamin D, apart from two others commercial diets (X and Y), the basal ingredients and compositions of the experimental diets and the commercial diet X are the same. When the fish reached 30 mm of total length, the occurrence of colour abnormality on ocular and blind sides and bone deformity were assessed. Vitamin A was not effective in preventing the colour abnormality on the blind side. However, fish fed experimental diet containing 20, 000 IU vitamin D/100g diet showed a higher rate of colour abnormality on the blind side compared with the commercial diet X which contained 6, 440 IU vitamin D/100g diet. Furthermore, the rate of normal blind side in the fish fed commercial diet Y containing trace amount of vitamin D was higher than that in the fish fed experimental diets. Although there was no expansion of black spot on the blind side during the experiment when fish were fed the commercial diet Y, the occurrence of bone deformity was high in the fish fed commercial diet Y. These results suggest that the balance of vitamins A and D or other basal ingredients is necessary to avert abnormal bone formation in Japanese flounder.

収録刊行物

  • 水産増殖

    水産増殖 46 (2), 279-286, 1998

    日本水産増殖学会

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