Examinationst on the fat metabolism in freshwater fishes. The sympathetic nervous system and the mobilization of fatty acids

Farkas, Tibor (1967) Examinationst on the fat metabolism in freshwater fishes. The sympathetic nervous system and the mobilization of fatty acids. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 34. pp. 129-138. ISSN 0365-3005

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Abstract

Noradrenaline in vivo (2 mg) did not increase the free fatty acid level in the blood of different freshwater fish species (carp, bream and pike-perch). The blood glucose level was increased and the plasma free fatty acid level ulate, even under in vitro conditions (2 µg/ml) the decomposition of triglycerides in the adipose tissue of different fishes (carp, bream, pike-perch, perch, shad). Under its influence the free fatty acid production of the adipose tissue in animals collected in winter, decreased while those of animals collected in summer, did not change. Under stress conditions (cold stress, injection of physiological solution, anoxia) the blood glucose level was increased, however, the plasma free fatty acid level either remained unchanged or decreased (carp, pike-perch, bream). The “antilipolytic” effect of the hormone might be in relation to its hyperglycaemic effect. It is supposed that, in fishes in contrast to mammals the sympathetic nervous system, has no role in mobilizing the fats in the form of free fatty acids.

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