Abstract
Summary
1. Whole Arctic sticklebacks and ordinary guppies were analyzed for fatty acids, cholesterol and lipid phosphorus.
2. It was found that diet does not have an appreciable effect on the lipids in the guppies.
3. Cholesterol and fatty acid are higher in the guppies than in the Arctic fish. On the other hand phospholipid is essentially the same in all the fish examined.
4. There is more phospholipid in relation to cholesterol in the Arctic sticklebacks than in the guppies, a fact which may be interpreted as indicating a higher level of fat turnover in the former than in the latter.
5. The ratio of cholesterol/lipid phosphorus is lower in the stickleback than in the guppy, indicating a lower water content in the tissues of the former. This may be correlated with the reported ability of the stickleback to resist freezing injuries.
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