Abstract
Immediate-energy-supply pathways were analysed during burst-swimming in white muscle of the Antarctic fish Notothenia neglecta, (collected during Austral summer 1984 near Signy Island, South Orkneys). Selected enzyme activities were determined, and tissue metabolites were measured, before and after 3 min of burst-work. The activity of glycolytic enzymes is very low compared to that in other fish, while the activities of creatine phosphokinase, adenylate kinase and AMPdeaminase are relatively high. Concentrations of metabolites associated with cellular energy status declined with exercise. At the same time, there was no change in the concentrations of most of the glycolytic metabolites measured (including glycogen, glucose and lactate), while [creatine phosphate] declined and [inosine monophosphate] increased. These observations were used to propose that the potential for ATP generation via creatine-phosphate hydrolysis is enhanced in N. neglecta, while glycolytic capacity is relatively reduced. This is an unusual pattern of ATP production and places severe constraints upon the behavior of the fish. While the capacity for very short-term, high-power-output swimming is increased, the capacity for medium-duration swimming is reduced. Ecological repercussions are discussed.
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Communicated by J. Mauchline, Oban
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Dunn, J.F., Johnston, I.A. Metabolic constraints on burst-swimming in the Antarctic teleost Notothenia neglecta . Marine Biology 91, 433–440 (1986). https://doi.org/10.1007/BF00392593
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DOI: https://doi.org/10.1007/BF00392593