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Effects of hypoxia on aerobic metabolism and active electrosensory acquisition in the African weakly electric fish Marcusenius victoriae.

In this study, the hypoxia tolerance of a mormyrid weakly electric fish, Marcusenius victoriae, was assessed by examining both its metabolic rate and electric-organ discharge (EOD) production using a critical threshold (pcrit ) paradigm. Routine metabolic rate was 1.42 mg O2 hr-1 and the associated critical oxygen tension was 14.34 mm Hg. Routine EOD rate was 5.68 Hz with an associated critical tension of 15.14 mm Hg. These metabolic indicators of hypoxia tolerance measured in this study were consistent with prior studies on M. victoriae and other weakly electric fishes. Furthermore, our results suggest that some aerobic processes may be reduced in favour of maintaining the EOD rate under extreme hypoxia. These findings underscore the importance of the active electrosensory modality to these hypoxia-tolerant fish.  This article is protected by copyright. All rights reserved.