Alternative reproductive behaviour in fishes, with particular reference to Lepomis macrochira and Pseudocrenilabrus philander

In the sunfish, Lepomis macrochira, males have discrete alternative reproductive life histories each with an equal potential for reproductive success. However, the alternative reproductive tactics of the cichlid, Pseudocrenilabrus philander, appear to have unequal payoffs. The adoption of either the territorial or the sneaking option in the cichlid fish is dictated by social conditions within the hierarchy. Consideration is given to Austad's questioning the value of models of Evolutionary Stable Strategies and to his proposed reclassification of alternative reproductive behaviours. © 1990 Kluwer Academic Publishers.