ドジョウに対するアミノ酸と塩基性窒素化合物の摂餌誘引活性〔英文〕

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The feeding attraction activities of a variety of amino acids and nitrogenous bases were investigated in a behavioral and statistical manner for oriental weatherfish Misgurnus anguillicaudatus. Of twenty-six authentic L-amino acids, the activities were recognized in histidine, arginine, lysine and ornithine among the basic amino acids. Especially, histidine and lysine evoked remarkably on feeding attraction behavior from the fish. About half of the neutral amino acids were found to be effective in the attraction. Among the amides, acidic and imino amino acids only asparagine induced strikingly the attraction in the fish. L-Amino acids elicited the attraction, but not D-ones. Of forty-three pure chemicals of nitrogenous bases, the activities were appreciably high in ammonia, monoethylamine, dimethylamine, trimethylamine, monoethanolamine and pyrrolidine among volatile nitrogenous bases. Especially ammonia and pyrrolidine were most potent on the attraction. In addition, the activities were also found in quaternary compounds among non-volatile nitrogenous bases.The threshold values were estimated to be 5×10-7 M and 7×10-11 M for the representative attraction chemicals, L-histidine and ammonia, respectively.
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