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ABSTRACT
The influence of photoperiod on ovarian development was studied in Liza ramada (Risso) before, during, and after the breeding season. L. ramada naturally breeds around December. In specimens investigated experimentally, either during or out of the breeding season, only those kept under short photoperiods possessed developed ovaries. Long photoperiods, continuous light, or continuous darkness arrested ovarian growth throughout the year, while ovaries already developed regressed. There was no difference in ovarian development between fish kept in freshwater and those kept in seawater when submitted to a short photoperiod regime.