アルテミアの脂肪酸組成と餌料効果〔英文〕〔種苗生産における栄養学的研究-9-〕

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A trial was conducted in order to improve the dietary value for red seabream juvenile of Artemia nauplii of the freshwater type containing a high amount of 18:3ω3, the EFA for freshwater fish, by feeding them marine Chlorella and ω-Yeast, both rich in ω3 HUFA, such as 20:5ω3 and 22:6ω3. Feeding of the newly-hatched nauplii of the freshwater type from San Francisco to fish resulted in sudden heavy losses of the fish on 6th day of feeding, and a high cumulative mortality. The survival rate at the activity test of the fish was also low in these fish. The dietary value of the nauplii was effectively improved by feeding them marine Chlorella or ω-Yeast, and the high mortality was markedly reduced. The juveiles receiving nauplii of the marine type from San Francisco and Canada, containing relatively a high amount of 20:5ω3, one of the EFA required by marine fish, were high in the survival rate, indicating that Artemia of the marine type are satisfactory as food for the red seabream. The most marked difference between the fish fed respectively with the freshwater type nauplii and those cultured with marine Chlorella or ω-Yeast was the shock syndrome observed in the fish fed on the former nauplii during the activity test. These results clearly demonstrated that the content and class of EFA contained in Artemia are the principal factor in the food value of Artemia to fish. The analyses of Artemia eggs from different locations for fatty acids showed that Atremia can be roughly classified inot two types, the freshwater type and the marine type.

アルテミアの脂肪酸組成と餌料効果〔英文〕〔種苗生産における栄養学的研究-9-〕

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