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Abstract ▼ AI-Helper

A series of assessments on the biological control potential with the common fat minnow (Moroco oxycephalus) and oriental weatherfish (Misgurnus anguillicaudatus) were conducted against Culex pipiens pallens, Culex tritaeniorhynchus and Anopheles sinensis larvae both in the laboratory and semifield r...

A series of assessments on the biological control potential with the common fat minnow (Moroco oxycephalus) and oriental weatherfish (Misgurnus anguillicaudatus) were conducted against Culex pipiens pallens, Culex tritaeniorhynchus and Anopheles sinensis larvae both in the laboratory and semifield rice paddies of University Experimental Station in Suwon from July through September, 1992-1993. In the laboratory, the higher predation rate by one mature fish (Moroco oxycephalus) against Cx. pipiens pallens larvae was on the average of 210.5 larvae per day, followed by An. sinensis and Cx. tritaeniorhynchus as 167.9 and 160.0, respectively. A mature fish of Misgurnus consumed Cx. pipiens on the average of 168.4 third instar larvae per day; an immature fish consumed in range of 112.7-144.0 larvae per day. Predation of the fish at 3 different release rates of 1, 2, and 4 fish per aquarium resulted in 129.5, 253.8 and 320.6 3rd-instar mosquito larvae, respectively. In semi-field assessment, Moroco oxycephalus at the release rates of 1, 2, 4, and 8 fish per $m^2$ resulted in 43.6%, 50.4%, 63.6% and 71.8% An. sinensis control after 1 week respectively; subsequent, biocontrol rate increased to 100.0% in higher release rate groups (4 fish/$m^2$, 8 fish/$m^2$), however, in a substantial control of 71.6% was obtained from 2 fish per $m^2$ in 3 weeks after the fish introduction. Misgurnus anguillicaudatus introduction at 2 fish/$m^2$ produced 34.6% and 35.3% An. sinensis reduction in ca. 4 and 8 weeks respectively; while 4 fish per $m^2$ yielded substantial biological control against An. sinensis, Cx. pipiens pallens and Cx. tritaeniorhynchus combined, by 53.8% and 55.2% in ca. 4 and 8 weeks in comparision with that of control paddies.

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