日本水産学会誌
Online ISSN : 1349-998X
Print ISSN : 0021-5392
ワカサギの生態學的研究-II
石狩川の舊及び現水路のワカサギに就いて
浜田 啓吉
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ジャーナル フリー

1953 年 19 巻 2 号 p. 79-82

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The pond smelt, Hypormesus olidus (PALLAS), migrates inherently into the sea and ascends for spawning to streams, but the land-locked form also occurs commonly in lakes and pond in Japan.
The studies on the land locked-form of Main Land of Japan have been carried out by F. MATSUZAKI, ('36) and T. FUJITA, & S. KOKUBO, ('26), I AMEMITA & Y. HIYAMA, ('31), H. KOBAYASHI ('36) and K. MATSUBARA, ('46). However, nothing has been studied on the fish which ascends in fresh water from the sea.
Of the fishes of the River Ishikari, the school of the present waterway which ascends from the sea differs from the fish of the old waterway in the morphological characters such as the body length, the scale structure and the number of vertebrae.
Consequently, each school of both waterways is independent ecologically with each other, The fish of the present waterway migrates into the sea, while the school of the old waterway stays through the life in fresh water, in spite of the presence of passage to the sea.

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