Abstract
Denticles (banjoshi in Japanese term) constituting comb-like teeth were extracted from about 200 adult ayu, Plecoglossus altivelis Temminck et Schlegel: about 100 fish from the Yahagi River (anadromous type) and about 100 fish which were collected in Lake Biwa and then cultured for two months in a pond (lacustrine type).The two types of samples were analyzed for calcium, magnesium and ash contents by chelatmetry.Calcium made up 22-23% of the dry weight of denticles, and the total ash accounted for about 54% of the dry weight of denticles.Amounts of calcium, magnesium and ash were not different in anadromous and lacustrine types of the species.The results were basically similar to the amounts of calcium, magnesium and ash obtained for rats and rabbits.
