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vol.61 issue4Temporal and spatial patterns on serra, Scomberomorus brasiliensis (Teleostei, Scombridae), catches from the fisheries on the Maranhão coast, BrazilNutritional status response of Daphania laevis and Moina micura from a tropical reservoir to different algal diets: Scenedesmus quadricauda and Ankistrodesmus gracilis author indexsubject indexarticles search
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Brazilian Journal of Biology

Print version ISSN 1519-6984On-line version ISSN 1678-4375


PANEPUCCI, R. A. et al. The effect of hypoxia and recuperation on carbohydrate metabolism in pacu (Piaractus mesotamicus). Braz. J. Biol. [online]. 2001, vol.61, n.4, pp.547-554. ISSN 1519-6984.

A study of the hematological parameters, glycogen, glucose, and lactate, and the activity of malate and lactate dehydrogenases was carried out in blood and tissues of fishes submitted to two, four, and six hours of hypoxia and recuperation. Only after 4 h of hypoxia was there a drop in liver glucose. After 6 h, a drop in lactate and a rise in glucose in practically all tissues signaled a recuperation of the metabolism, probably due to ASR (aerial surface respiration). Lactate formed during hypoxia was canalized to heart and brain for oxidation and used for neoglucogenesis. There were no changes in hematological parameters nore in the activity of malate and lactate dehydrogenases during normoxia and hypoxia, which suggest that these adaptive mechanisms may not be involved during hypoxia. Glycogen concentrations did not show variation during hypoxia either.

Keywords : hypoxia; carbohydrate metabolism; dehydrogenases; fishes.

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