伊勢湾で獲れたアマゴの降海型について
1973 年 20 巻 2 号 p. 107-112
詳細
1973 年 20 巻 2 号 p. 107-112
Morphology of three forms of Oncorhynchus rhodurus Jordan and McGregor were studied.In comparison with the fluviatile form and the lacustrine form in Lake Biwa, characters of the sea-run form resemble those of the fluviatile form, and differ from those of the lacustrine form in Lake Biwa in number of pyloric caeca, transverse scales, ventral fin rays, and in crimson spots on lateral body (Figs.4-6, Table2).
The sea-run form shows the following characters: the body color is silvery;the tip of the dorsal fin is dipped with jet black;crimson spots are scattered on the lateral side (Fig.2).Its smolt shows following characters;the body color is silvery;parr marks have disappeared;scales are easily taken off;the tip of the dorsal fin is dipped with jet black;the posterior margin of the caudal fin is edged with jet black;crimson spots are scattered on the lateral side (Fig.2).
