The feeding attraction activities in various combinations of effective amino acids and other compounds were behaviorally and statistically investigated for the following three test animals, young abalone Haliotis discus, adult oriental weatherfish Misgurunus anguillicaudatus and juvenile yellowtail Seriola quinqueradiata. Of the combinations of amino acids, the activities generally in-creased in all test animals, Of the combinations of lipids, the activities were ascertained to increase for abalone and yellowtail in the combinations added with lecithin, those for the former depending remarkably on lecithin only. Of the combinations of nitrogenous bases, the activities in the combinations of volatile bases increased for oriental weatherfish, but not so for abalone because of the high activity of a single compound, pyrrolidine, In contrast, the activities in the combina-tions of non-volatile bases were ascertained to increase for abalone in some combinations. Of the cominations of proteins, the activities appreciably increased for abalone in the combinations which had human albumin added to it. On the other hand, the activities in the combinations of the compounds belonging to different constituents remarkably increased for yellowtail.