Solution

Gambusia affinis (mosquito fish) feeds on mosquito larvae.
It is introduced into ponds and tanks as a biological control measure against mosquitoes, which spread malaria, dengue and filariasis.
Rohu (Labeo) and Clarias are food fishes, and Exocoetus is the flying fish.
So Gambusia selectively feeds on mosquito larvae.

Concept Gambusia as larvivorous fish

Human Health and Disease in past papers

121 questions from this chapter have appeared across 27 exam years.