養魚飼料に関する研究-I : ニジマス在来餌の品質について

概要

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Dried mysis (Neomysis japonica) and dried silkworm pupa are frequently used for rainbow trout culture in Japan. As little attention has been paid to the quality of these feeds, however, the authors carried out analysis of these products to examine whether their quality is adequate for rainbow trout. The materials were provided from trout hatcheries in various parts of the country. As shown in Table 1, most of dried mysis contained a great deal of volatile base and were almost putrefied. However, we have noticed that they still contained a fairly large amount of vitamin B12. Therefore, these mysis can be used only for the source of watersoluble vitamins. But they should not be usd in a large amount because there is a risk of increasing of detrimental substances. The quality of dried silkworm pupa was better than that of mysis, as shown in Table 2. However, the fat contents were very high, and moreover, most of fats which were separated from samples showed high peroxide values. According to our previous work*, the peroxides contained in autoxidized oil showed a toxicity to animals. From these results we can conclude that the ordinary dried silkworm pupa is not good for feeding rainbow trout.
公益社団法人日本水産学会の論文