Abstract
1. 1. Seasonal fluctuations in the plasma levels of growth hormone (GH) and free fatty acids (FFA) were studied in harp seal ( Pagophilus groenlandicus) pups under captivity. 2. 2. A synchronous pattern in the levels of GH and FFA was observed from March to July with FFA reaching the peak in June. This was followed by a fluctuating pattern with levels high in GH and low in FFA and vice versa from July to January except in October when GH level was lowest and FFA also dropped. 3. 3. The synchronous pattern in GH-FFA rhythm is correlated with the period of rapid post-natal growth. The peak FFA level and a significant rise in GH in June are attributed to changes influenced by northward migration. 4. 4. The fluctuating pattern in the rhythm is correlated with increased activity, and the shift in the rhythm during October with changes due to southward migration.
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