Nippon Suisan Gakkaishi 68 (3), 327-333 (2002)

Estimation of protein sources and effects of water-soluble nitrogen components in artificial diets on larval ayu

SYOZO YAMAMOTO,1 SHUICHI SAKAMOTO2 AND MASAAKI TAKEUCHI3

1Fisheries Experiment Station Okayama Prefecture, Ushimado, Okayama 701-4303, 2Oriental Yeast Co., LTD, Chiba, Chiba 261-0002, 3Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan

This report describes the nutrient value of water-soluble nitrogen components in diets for larval ayu Plecoglossus altivelis. Larval ayu with 3.2mg mean body weight were reared on five kinds of test diet containing different protein sources for 31 days.

The diets containing vacuum freeze-dried larval sardine Sardinops melanostictus as the protein source promoted growth, improved the survival rate, and increased the resistance to fasting. The performances of the diets were almost the same as those of the living organisms, so these diets were considered suitable for larval ayu.

These diets contain plenty of water-soluble nitrogen components which are known to be lower molecular proteins or peptides. This result proved the mechanism of larval protein absorption inferred from histochemical research.


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