Ketone Bodies in the Blood of Salmonoid Fishes

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Abstract
The concentration of acetoacetate expressed as acetone in the blood of rainbow trout (Salmo gairdnerii) was generally in the range of 0.3-1.0 mg/100 ml and long periods of starvation did not appear to affect this level to any appreciable extent. In sockeye salmon (Oncorhynchus nerka) in the pre-spawning stage of migration the concentration of acetoacetate was within the range found for rainbow trout. Higher concentrations of acetoacetate, amounting to approximately 1.5 mg/100 ml of blood, were present in sockeye salmon at the spawning grounds. Rainbow trout, which had been exercised, yielded greater value for [beta]-hydroxybutyrate, and it was shown that under these conditions lactic acid interfered with the determination of [beta]-hydroxybutyrate. Starvation of rainbow trout did not affect the concentration of [beta]-hydroxy-butyrate to any appreciable extent. In spawning salmon [beta]-hydroxybuty-rate showed some increase, as compared with fish in the pre-spawning stage of migration.

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