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Seasonal changes in intracellular pH (pHi) and concentration of ATP, phosphoarginine (Parg) and inorganic phosphate (Pi) were evaluated by 31P Nuclear Magnetic Resonance Spectroscopy (NMR). Nucleotides were extracted from the same individuals and analysed by High Performance Liquid Chromatography (HPLC). In resting prawns in winter, contents of inorganic phosphate and sugar phosphates (SP) increased significantly, but phosphoarginine, ATP, ADP and total adenylate concentration decreased significantly. AMP and IMP tended to increase, but not significantly. The NMR index (Parg + Pi/PATP + Parg A Pi) and the Parg/Pi ratio changed seasonally, unlike the adenylate energy charge. Intracellular pH was significantly lower in winter, which does not conform to the alphastat hypothesis At lower temperatures, the prawns exhib~ted a reduced capacity to be active. At exhaustion, only the content of sugar phosphates and ATP and the intracellular pH were signif~cantly changed. Recovery of intracellular pH after exhaustion was dependent on season. I t is concluded that seasonal variations must be taken into account when studying muscular energy metabolism in ectothermic animals.

Seasonal variations in Palaemon serratus abdominal muscle metabolism and performance during exercise, as studied by 31P NMR