Abstract
1. 1. Scale regeneration was examined in Oreochromis niloticus under normal, dietary calcium-deficient, and both dietary and ambient water calcium-deficient conditions. 2. 2. Calcium contents of regenerating scales were dependent on the calcium status of the fish, but areal growth of the scales was independent. 3. 3. Transient hypocalcemia accompanied with a loss of calcium from original scales was observed in descaled fish in dietary calcium deficiency, and intact and descaled fish in both dietary and ambient water calcium deficiency. 4. 4. The results suggested that calcium mobilized from internal sources was insufficient and both water and dietary calcium were necessary for normal calcification of the regenerating scales.
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