Abstract
1. 1. The nature of photoperiod and temperature interactions on the level of hypothalamic monoamine oxidase activity in the goldfish was examined. 2. 2. Exposure of goldfish to long photoperiods (16L/8D) significantly elevated enzyme activity above that found in fish exposed to shorter photoperiods, but only when animals were kept at 20–22°C. No photoperiod effects were found in the case of animals maintained at 13°C however. 3. 3. Low temperatures (13°C) were effective in depressing hypothalamic monoamine oxidase activity, as compared to 22°C-acclimated fish, only when animals were maintained under a 16L/8D photoperiod. 4. 4. These data suggest that hypothalamic monoamine oxidase is regulated not simply by temperature or photoperiod acting independently, but by the interaction of these two factors.
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