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Field studies on the introduction of the mosquito predator Toxorhynchites amboinensis (Diptera: Culicidae) into Fiji.

Toxorhynchites amboinensis was introduced into 2 areas of Fiji between February 1980 and 1981. A total of 1717 adult females were released at Wailoku Village and 400 females on Yanuca Island. Numbers of Toxorhynchites and Aedes spp. larvae were monitored in tin cans and tires set out in the release areas. Very few of the Toxorhynchites released at Wailoku Village oviposited in the monitored containers; however, this species quickly established itself on Yanuca Island. The mean overall estimated reduction of Aedes by Tx. amboinensis over a 10-month period was 22% in the tins and 63% in the tires. The total estimated reduction per container was 61.5% in the tins and 90% in the tires. The tins contained Aedes 73% and Toxorhynchites 39% of the time, while the tires contained Aedes 54% and Toxorhynchites 89% of the time. It was concluded that success in using Tx. amboinensis as a control agent for mosquitoes will depend greatly on the habitat into which it is introduced.