ニジマス卵のビオラキサンチン(予報)

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It is very often obscrved that the hatching rate of the eggs of cultured rainbow trout differs considerably depending on the individuals of parent fish even when they are cultured in the same pond. Supposing the poor hatching is ascribable to the lack of some nourishing elements, the authors have compared analytically the eggs of various hatching rates. The Tochigi Prefectural Trout Hatchery offerd numbers of sample on the eyed stage with the data of various hatching rates. (Table 1.) The results obtained are as follows; 1. The contents of moisture, total nitrogen, crude fat, crude ash, calcium and phosphorus do not differ markedly among the samples. It is noticeable that the content of iron is scarce in the eggs of low hatching rate. (Table 2.) 2. A kind of carotenoid was obtained from the egg. From its absorption maxima and chroma ?? ographic behavior this carotenoid can be identified with violaxanthin. (Table 3, Fig. 2) 3. Astacene, violaxanthin, vitamin A and carotene (uncertain) were obtained from each sa-mple. The difference of contents in astacene, vitamin A and carotene do not seem to have a relation to the hatching rate. (Table 4.) The content of violaxanthin decreases in order of lower hatching rates, the fact reveals that this carotenoid may be an important element on the hatching of the eggs of cultured rainbow trout.
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