Abstract
1. 1. Fiften free amino acids were quantified in blood, liver, white muscle and red muscle of fasting goldfish subjected to 12 hr of anoxia. Normoxic goldfish were used as controls. 2. 2. The anoxia treatment significantly raised the total pool of free amino acids in whole blood and liver. 3. 3. A general trend is observed in all the anoxic tissues: the free amino acids, for the most part, increase in absolute amounts. A strong accumulation is observed for some specific (groups of) free amino acids: alanine, the branched-chain amino acids and the aromatic free amino acids. 4. 4. Only the amide glutamine decreases substantially in the white muscle. 5. 5. These measurements indicate proteolysis of tissue proteins in anoxic goldfish and are interpreted as evidence for a coupling of glycolysis and amino acid catabolism.
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