High energy turnover at low temperatures: recovery from exercise in antarctic and common eelpout (Zoarcidae

• Main Authors: I. Hardewig, P. L. M. Van Dijk, H. O. Pörtner
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 1998
• Subjects: Antarctic; Cara; Antarc*
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1031.673; http://ajpregu.physiology.org/content/ajpregu/274/6/R1789.full.pdf

High-energy turnover at low temperatures: recovery from exhaustive exercise in Antarctic and temperate eelpouts. Am. J. Physiol. 274 (Regulatory Integrative Comp. Physiol. 43): R1789–R1796, 1998.—Earlier work on Notothenioids led to the hypothesis that a reduced glycolytic capacity is a general adaptation to low temperatures in Antarctic fish. In our study this hypothesis was reinvestigated by comparing changes in the metabolic status of the white musculature in two related zoarcid species, the stenothermal Antarctic eelpout Pachy-cara brachycephalum and the eurythermal Zoarces viviparus during exercise and subsequent recovery at 0°C. In both species, strenuous exercise caused a similar increase in white muscle lactate, a drop in intracellular pH (pHi) by about 0.5 pH units, and a 90 % depletion of phosphocreatine. This is the first study on Antarctic fish that shows an increase in white