Abstract
1. 1. The phospholipid fraction of goldfish gill mitochondria contained proportionately more cardiolilpin and phosphatidyl ethanolamine and less sphingomyelin at 10°C than 30°C but total phospholipid phosphorus levels ramained unchanged. 2. 2. The total mitochondrial lipids from both goldfish and yellow bullhead gill tissues were more unsaturated at the colder acclimation temperatures. 3. 3. Generally, the levels of saturated and monounsaturated fatty acids were reduced and polyunsaturated fatty acids were increased in both species at the lower temperature. 4. 4.l Changes in mitochondrial lipid composition presumably assist in maintaining a specific molecular organization over a wide range of environmental temperatures.
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