Abstract
1. 1. Assessment of glycogen and glucose content and glycogen phosphorylase, glycogen synthetase, hexokinase and fructose 1,6-bisphosphatase activity in liver and white muscle of domesticated rainbow trout ( Oncorhynchus mykiss) transferred to diluted seawater (12 p.p.t.). Plasma glucose levels were also determined. 2. 2. A decline in liver glycogen content was observed throughout the 12–120 hr period in diluted seawater (dSW). Liver free glucose also showed a decrease, though only significant at 120 hr in dSW. 3. 3. The activity of liver glycogen phosphorylase a and a + b was higher in dSW animals, but glycogen synthetase was unchanged. 4. 4. No changes in liver hexokinase and fructose 1,6-biphosphatase activity were observed. 5. 5. In white muscle and plasma only white muscle glycogen synthetase activity showed a change, in particular a decline in dSW animals. 6. 6. Although domesticated rainbow trout do not naturally migrate to seawater, these data suggest that a depletion of liver reserves occurred in a way similar to that described for other salmonids.
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