The gonadal and fat body cycles and their relationship to environmental factors are described for the Antillean frog Eleutherodactylus planirostris during a seasonal cycle in Havana, Cuba. Reproduction was discontinuous in both sexes. Bimodal vitellogenesis was observed from April—October. The first vitellogenic wave occurred April—June. In August an ovarian weight downgrade was observed due to oviposition. The second wave was September—October. Spermatogenesis started in March, with a high spermatogenic activity during June and July, and ended in November. In both sexes, fat bodies varied seasonally and showed an inverse relationship to the gonadal cycle, which supports its possible role as an energetic reserve for reproduction. Temperature was the environmental factor that significantly influenced the vitellogenic activity. Photoperiod was inversely related to fat bodies of both sexes.
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