Question

Why is Gambusia introduced into drains and ponds?

Answer 1

Gambusia is a kind of fish that preys upon the larvae of mosquitoes. It is therefore introduced into the drains and ponds. To feed on Mosquito larvae / to eliminate the vectors responsible for causing malaria. It thus helps in controlling malaria.
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Answer 2

Because to feeds on the mosquitoe larvae thus, acts as biological control of the mosquito population.

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