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Do fish repel oviposition by Aedes taeniorhynchus?

S A Ritchie¹, C Laidlaw-Bell

¹Collier Mosquito Control District, Naples, FL 33941.

Journal of the American Mosquito Control Association

|September 1, 1994

Summary

Fish presence deters mosquito egg-laying, impacting their population dynamics. Mosquitoes avoid areas with higher fish concentrations, suggesting fish indirectly control mosquito populations through this behavior.

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Area of Science:

Ecology
Entomology
Aquatic Ecology

Background:

Mosquitoes are significant disease vectors.
Understanding factors regulating mosquito populations is crucial for disease control.
Fish are known predators of mosquito larvae, but their role in deterring egg-laying is less understood.

Purpose of the Study:

To test the hypothesis that fish indirectly control mosquito populations by repelling oviposition (egg-laying).
To investigate the effect of fish presence and density on Aedes taeniorhynchus oviposition behavior.

Main Methods:

Comparing Aedes taeniorhynchus oviposition in mangrove forests, natural pools, and excavated pools with varying fish concentrations.
Quantifying egg densities in relation to fish presence and density.
Observing changes in oviposition after fish mortality events.

Main Results:

Mosquito oviposition was significantly lower in water bodies containing fish compared to fishless ones.
Oviposition was concentrated in areas with lower fish densities.
Egg densities increased significantly after fish were killed by drying events.
Excavated pools also showed fish significantly affected oviposition.

Conclusions:

Aedes taeniorhynchus actively avoids ovipositing in sites with higher fish concentrations.
The observed avoidance behavior is mediated by the presence of fish.
This fish-mediated oviposition avoidance may influence mosquito migratory habits and population dynamics.

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