カダヤシとメダカの関東地方における分布

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A survey was made on the distribution in the Tokyo Metropolitan area (Kanto Plain) of the two mosquito-larvivorous fishes, Gambusia affinis (top minnow or mosquito fish) and Oryzias latipes (medaka) by our direct inspection as well as from the information responding to the questionnaires from 859 middle schools in the Prefectures of Gunma, Tochigi, Ibaraki, Saitama, Chiba, Kanagawa and Tokyo. Gambusia affinis is a poeciliid ovoviviporous fish introduced into Japan in 1916 from southern United States via Hawaii and Taiwan for the purpose of malaria control, and has been noted recently to be distributed in rather polluted waters in and around the city of Tokyo, whereas, Oryzias latipes is a native fish widely distributed in streams and ditches containing cleaner water. Gambusia affinis was found in ditches and swamps in the more urbanized areas near the coast of the Bay of Tokyo, especially in the cities of Tokyo, Yokohama and Chiba, and also in the areas north of Tokyo lined by the Rivers Arakawa and Furutonegawa, where the waters were more or less polluted by sewage. Sporadic distributions of this species were noted in the ponds in Tokyo, Utsunomiya and Tsuchiura where the fish had been introduced artificially. Oryzias latipes was found in the rural areas surrounding these large cities, particularly in rice paddies and streams in Kanagawa, Saitama, Gunma, Tochigi, Ibaraki and Chiba Prefectures. Large numbers of Gambusia have been observed to be inhabiting in the water of the Bay of Tokyo near the wharf of Tokyo Harbour, and thus we assume that it has established in a number of canals along the Bay shore by them selves.
日本衛生動物学会の論文
1974-12-15

カダヤシとメダカの関東地方における分布

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