SciELO - Scientific Electronic Library Online

 
vol.64 número3BCanto de anúncio de Hyla jimi e Hyla elianeae (Anura, Hylidae) na região de Botucatu, São Paulo, BrasilCitogenética de Cnemidophorus littoralis (Teiidae) da restinga da Barra de Maricá no Sudeste do Brasil índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Brazilian Journal of Biology

versão impressa ISSN 1519-6984

Resumo

MORAES, G.; CHOUDHURI, J. V.; SOUZA, R. H. S.  e  NETO, C. S.. Metabolic effects of exercise in the golden fish Salminus maxillosus "dourado" (Valenciennes, 1849). Braz. J. Biol. [online]. 2004, vol.64, n.3b, pp. 655-660. ISSN 1519-6984.  http://dx.doi.org/10.1590/S1519-69842004000400013.

Strenuous exercise in fish is usually a consequence of migration, reproduction, and spawning. Varying among fishes, this kind of stress is associated with blood glucose and lactate increase, in relation to which two major groups are distinguishable: the "lactate releasers" and "non-lactate releasers". Unlike strenuous exercise, sustained swimming imposes a variety of effort that results in distinct kinetic types of blood lactate and glucose. Compared to Platichthys stellatus and Oncorhynchus mikyiss, blood lactate of Salminus maxillosus (dourado) was lower after exercise, whereas recovery time was greater. Great demands were made of white muscle, and dourado is not a lactate releaser. Two different metabolic tendencies were observed in sustained and intense swimming. Gluconeogenesis was observed during recovery, as well as the alanine cycle which recomposes the lactate tissue pattern. Full recovery after intensive exertion required more than 24 hours.

Palavras-chave : fish exercise; lactate kinetics; chasing; sustained swimming; Salminus maxillosus; metabolic adaptation.

        · resumo em Português     · texto em Inglês     · pdf em Inglês