An Evolutionary Model of Parental Care in St. Peter's Fish

Galilee St. Peter's fish shows unusual lability in caring patterns; male-only, female-only and biparental care all occur in the same population. We present a game-theoretical model and investigate the evolutionary stability of the care frequencies observed. Using mean values for each of the model's parameters (estimated previously for the Lake Kinneret population of St. Peter's fish) we find that the current care frequencies are unstable and …