nual intervals is a relatively common phenomenon in shallow water fishes. The guppy, Poecilia reticulata and mosquitofish, Gambusia sp. produce young at approximately 30-day intervals (Turner, 1937). The California grunion, Leuresthes tenuis (Clark, 1925) has a semilunar reproductive cycle in which spawning occurs in synchrony with the spring tides of new and full moon during a reproductive season of several months. Recent field observations on the mummichog, Fundulus heteroclitus (Taylor et al., 1979)
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Taylor et al. (1980) studied this question.