Perissodus are small,scale-eating fish that live in Lake Tanganyika in Africa.They attack larger fish from behind.The right-mouthed Perissodus attack on the left side of the larger fish and the left-mouthed Perissodus attack on the right side of the larger fish.The existence of the right-mouthed variety ensures the equally successful existence of the left-mouthed variety.This is an example of:

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This is an example of frequency dependent selection because the success of each variety depends on the frequency of the other variety. If one variety becomes too common, its success decreases as the larger fish learn to recognize and avoid its attack. Therefore, to maintain balance and success, the frequency of each variety must remain relatively equal.

Perissodus Are Small,scale-Eating Fish That Live in Lake Tanganyika in Africa.They