Abstract
The oxygen uptake rate (VO 2 as μg O 2/g/hr), the critical partial oxygen pressure (Pc 2 ) and the presence/absence of aquatic surface behavior (ASR) under hypoxia was studied for 10 cichlid species from different habitats ( Oreochromis niloticus, Steatocranus tinanti, Astatotilapia burtoni, Dimidiochromis compressiceps, Nimbochromis venustus, Melanochromis auratus. Tropheus moorii, Neolamprologus brichardi, Julidochromis marlieri and Eretmodus cyanostictus). After correcting for differences in bodyweight, the differences in VO 2 were shown to be not statistically significant between cichlids from lacustrine and fluvial habitats. The capacity to regulate VO 2 as μg O 2/g/hr under gradually increasing hypoxia (P o 2 < Pc o 2 ) differs markedly among the studied species. Under the given experimental conditions two species ( Julidochromis marlieri, Neolamprologus brichardi) were conformers at 0 < P o 2 < 150 torr. Six species that naturally occur in well aerated water were not able to perform ASR when subjected to severe hypoxia (0.8–1.5 ppm O 2) ( Julidochromis marlieri, Neolamprologus brichardi, Eretmodus cyanostictus. Tropheus moorii, Melanochromis auratus, Steatocranus tinanti).
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