Abstract
1. The effects of photoperiod acclimation, pinealectomy, and sampling time on monoamine oxidase (MAO) activity in the basal medial lobe of the goldfish ( Carassius auratus) hypothalamus were examined. 2. A significant daily variation in MAO activity was observed in fish exposed to a long, but not the short photoperiod. 3. MAO activity was depressed in fish exposed to a short, as compared to a long photoperiod. 4. Pinealectomy elevated hypothalamic MAO activity in fish exposed to a short photoperiod, but had no obvious effect on enzyme activity in fish exposed to a long photoperiod. 5. The effects of pinealectomy on hypothalamic MAO activity seem to vary with season.
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