著者

広瀬 吉則 大久保 新也 安野 正之

出版者

日本衛生動物学会

雑誌

衛生動物 (ISSN:04247086)

巻号頁・発行日

vol.29, no.2, pp.163-168, 1978

被引用文献数

1

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The mosquito fish, Cambusia affinis (Baird and Girard) was introduced into Tokushima city in 1968 to control mosquito larvae in the salt marsh and the drains. Thereafter the fish propagated and spread into the wide area of the city. In the present study, it was clarified how extent they were distributing in the city area after 8 years since the introduction. The distribution of G. affinis in the winter season were limited. During several years following the introduction, the fish were spread by the members of laboratory. However it was confirmed by the present study that the fish spread themselves from the focus of the distribution to the surrounding areas during the spring and summer time. In the autumn of 1975,G. affinis distributed approximate 70 percent of the water bodies, whereas, larvae of Culex pipiens pallens distributed in the limited places. The effectiveness of G. affinis on the control of mosquito larvae was studied by releasing the fish into the drains where only Culex pipiens pallens larvae were inhabiting. After average 250 individuals of G. affinis per drain of approximately 2m×80m were released, the number of mosquito larvae decreased at 7 drains out 9. The fish settled in the these places and could be observed till four months later when the experiment was ended. The effectiveness of G. affinis on the mosquito control was studied also by examining the number of adult mosquitoes. Light traps were set up at the G. affinis densely inhabited area and the no G. affinis area. Comparison of the number of mosquito between the two areas indicated no significant difference. Mosquitoes seemed to be not abundant even in the area where no G. affinis inhabited in the present study.