Body Color Improvement of Goldfish by Oral Administration of Labyrinthulid

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  • ラビリンチュラの経口投与によるキンギョの体色改善
  • ラビリンチュラ ノ ケイコウ トウヨ ニ ヨル キンギョ ノ タイショク カイゼン

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Abstract

Labyrinthulid is a micro-organisms with a wide tolerance to salinity and high concentrations of astaxanthin and DHA. We examined the effects of astaxanthin (free-type) and Labiyrinthulid,Thraustochytrium sp. CHN-1, on the body color of fish. Goldfish (Shubun-kin),Carassius auratus, were used in this experiment. No significant change in the body color of goldfish that were orally administered astaxanthin (1.6 or 16mg/kg body weight/day) was found. On the other hand, a fine reddish color was observed on the goldfish that were orally administered Labyrinthulid (160mg/kg body weight/day: 0.05mg/kg body weight/day as astaxanthin) for several weeks. Two weeks administration of Labyrinthulid also increased significantly the number of the reddish color cells in fish skin. These results indicated that (i) oral administration of astaxanthin contributes little body color improvement in goldfish,(ii) oral administration of Labyrinthulid improved remarkably the body color of goldfish, and (iii) Labyrinthulid promoted an increase in number of the reddish color cells in the skin of goldfish.

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