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).
Three female specimens of the eel pout, Enchelyopus eloncotus (Kner), were, caught frorn Kunbetsu beach, Nemuro, Hokkaido on Dec.16, 1059 and Jan.19, 1960.Those lish.126.96.36.199 and 51.8cm.in total length.had 183.102 and 349 individuals of the fetus in the ovarian cavities, rc hcetively.The fetuses measured 45 io 50mm and Initl ilte inflated abdomen.No yolk suhstancc was left in he abdominal cavity, but the cavity was filled with voluminous and empty e pansion or the posterior portion of the intestine.
A specimen of the pink Salmon, Oncorhynchus gorbuscha (Walbuum), was caught at the lower Akka River: draining to the Pacific coast of the northern Honshu, Japan, on September 9, 1972, The specimen wsa a mature male with black blotches on the buck and tail, and 357mm standard length Scales J the. specimen are small and 164 on the lateral line. Characters of this specimen are anal fin rays 16, gill-rakers 28 and pyloric caeca 108.These values are the range for the pink salmon Qm which were collected in Hokkaido and reported by Hikita (1962) as shown in Table 1. Akka. River, the pink salmon.was caught, is situited about 70 km south of Oiirase River along the.Pacicific coast of Honshu.shu, Japan (Sato and Sato.1964).The return of the pink sailmon has not been previously reported from the rivers situated south of Oirase.River.Therefore, Akka River isat present soiuhertintost limit of the return of the pink salmon along the Parilic coast of lionshu, Japan.