In recent years, studies of the reproductive behavior of various species of anemonefishes have shown a high degree of similarity be-tween species (Allen, 1972;Fricke, 1974;Bell, 1976;Moyer and Bell, 1976;Ross, 1978).Characteristically, anemonefishes lay their eggs on coral or rocky substrate directly under the extended tentacles of the host anemone.Amphiprion polymnus (Linnaeus) shows unique differences in methods of nest construction compared to other anemonefishes. The present paper reports on these differences.