The attraction potential of sugars and related compounds were statistically estimated on the basis of an exploratory and feeding behavior of yellowtail, Seriola quinqueradiata. Among six monosaccharides, three disaccharides, six sugar alcohols, six glycosides, and two artificial sweeteners tested, the following compounds were found active; glucose, fructose, galactose, xylose, and rhamnose (monosaccharides), maltose and lactose (disaccharides), sorbitol and mannitol (sugar alcohols),

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... n, stevioside, rebaudioside, and phyllodulcin (glycosides), and saccharin and aspartame (artificial sweeteners). Galactose, maltose, and glycyrrhizin were highly attractive, particularly glycyrrhizin. The attraction capability of glycyrrhizin and maltose increased as concentration increased. The feeding attractants and stimulants for aquatic animals have already been reviewed*2. Among these aquatic animals, all fishes tested are attracted or stimulated by certain mono-and di-saccharides, but not repelled or deterred. These studies have dealt with saccharides which are sweet for humans. Meanwhile yellowtail, Seriola quinqueyadiata, oriental weatherfish, Misgurnus anguillicaudatus, and black abalone, Haliotis discus are remarkably attracted to stevioside of glycoside, which is 100-fold sweeter than sucrose to humans1).It would be interesting to know if the sugars of different sweet intensities are attractive to marine animals. In this context, the attraction potential of various mono-and di-saccharides, sugar alcohols, glycosides and artificial sweeteners were behaviourally tested using yellowtail, S. quinqueradiata. Materials and Methods Test animal and test tank Juvenile yellowtail(average fork length and body weight,5.6cm and 2.2g, respectively)were obtained from Senzaki Station of Aquaculture in Yamaguchi Prefecture. At the start of the experiment 148 fish were used and by the end 38 individuals remained. The rest of 110 individuals were timely removed,