Abstract
Digestibilities on various commercial feedstuffs for rainbow trout culture were tested by labelling the diets with P32 in the form of water-insoluble ammonium phospho-molybdate. The poor digestibility of fish meal was not improved by rendering it into powder as fine as 300 mesh through, neither affected by addition of commercial protease. The latter phenomenon may due to the too low temperature for the enzyme to act on the fish meal while staying in the fish stomach. The good digestibility of dried mysis powder freshly prepared was greatly reduced by the addition of hot-water extracts of degenerated dried mysis. Therefore one must be more careful about the degeneration of feeding stuff during the storage which is rather common phenomenon to trout farms, and cause a considerable loss in efficiency of materials. The highest digestibility of fish soluble will naturally be ascribable to a high content of water soluble substances.
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