Abstract
Morphological and biological characters of Ammodytes personatus and A.hexaperus from the waters nearby Soya in Japan were measured.The results indicated that there was some variance between the two species based on the function of body length and body weight and gonadosomatic index(GSI).One-way ANOVA results showed that though there was great(70%) overlap in vertebra numbers,difference between the two Ammodytes species in vertebra numbers was extremely significant(P0.01).The otolith angle was firstly used for identification of the two species.The average otolith angle of A.personatus [(86.8 0.4) ] was significantly lower than that of A.hexaperus [(93.0 0.5) ](P0.05).The exact discriminant rate(84.3% on average) was high based on otolith angle to identify the two species.It was suggested that otolith angle could be used for identifying A.personatus and A.hexaperus efficiently.
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