養魚飼料における脂質の役割に関する研究-I : ニジマスヘの脂質の多量投与の効果と健康への影響

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It is usually assumed that a large amount of oil contained in food for fish under cultivation is harmful. However, there are reasons to believe that oil kept in good quality would bring no harm to fish.To prove this point, breeding experiments of rainbow trout (Salmo irideus) were undertaken for six months in 1961. The kinds of oil used were fin whale oil and residual oil from molecular distillation of Vitamin A of Alaska pollack liver oil. In this experiment, the fish were divided into four groups A to D. Groups A to C were fed with diets containing both oils at the same levels 2.5, 7.5 and 12.5%, respectively. Group D had the diet containing the fin whale oil at 15% but not the other oil. Detailed compositions of the dietary ingredients and their nutritive components are given in Tables 1 and 2. The experiment was carried out, in two periods; the first period was from Jan. 27th to Apr. 18th and the second was from Apr. 19th to July 19th, 1961. Feeding was continued until the fish began to reject the offering. The experiment revealed that if the dietary oil was protected from oxidation or decomposition, the fish could be reared in good health with low mortality even when they were fed with a large amount of oil (Table 9). Measurement of the oil contents in different parts of the fish indicated an increase of the oil contents in the flesh, adipose tissue of vicera, liver and kidney with the progress of the feeding period. The ratios of the oil contents in these parts were parallel with those of oil in the diet (Table 6). In the first period of the experiment the groups of fish which grew faster than any other groups were B and D fed with the diet containing 15% oil; in the second period, it was group C fed with the diet of 25% oil (Tables 4 and 5). These phenomena may be attributed to any of the following reasons or their combinations: a) in the earlier months of the experiment the water tempexatu??e was lower, b) the fish were smaller in those months, c) in the later months they became accustomed to the diet of a high oil content.
公益社団法人日本水産学会の論文

養魚飼料における脂質の役割に関する研究-I : ニジマスヘの脂質の多量投与の効果と健康への影響

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