Abstract
In order to find a clue to the possible utility of fish meal as the fish diet, the relation between the commercial quality and the feed efficiency of fish meal was inquired. White fish meal (manufactured from flatfish, in the North Pacific Ocean) and brown fish meal (manufactured from saury, in the North East Pacific coast of Japan) were used as sample, with and without submitting to artificial oxidation in sunlight, respectively. Then, the samples of meal were evaluated by a physiological method (rainbow trout rearing of 3 months under feeding with sample meal) and by a chemical method, following results being obtained. 1) Feed efficiency of the brown meal tested in the present work showed as inferior to that of the white meal. This may be due to their difference in quality, especially in the properties of component oil of meal. 2) Feed efficiency of the oxidized fish meal was observed as lower than that of notoxidized meal. Since fish meal is considered to be gradually oxidized during the storage even in a dark and cool place as opserved in the present experiment, it is confirmed that the storage of fish meal for a considerable period will lower down the feed efficiency of the same.
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