Frequency- dependent selection,as seen in the case of the scale- eating fish in Lake Tanganyika,tends to

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Frequency-dependent selection maintains two or more different types or phenotypes in a dynamic equilibrium in a population. In the case of the scale-eating fish in Lake Tanganyika, larger-mouthed fish have an advantage over smaller-mouthed fish when preying on larger fish with scales, but the advantage is reversed when preying on smaller fish without scales. Therefore, both phenotypes are maintained in the population at a relatively stable frequency.

Frequency- Dependent Selection,as Seen in the Case of the Scale-