Labeo fimbriatus (Bloch) was tested at non-lethal temperatures to measure
its oxygen uptake both in oxygen dependant and independant zones. The metabolic
rate was almost uniform in oxygen independant zone, in oxygen dependant zone
reduced drastically and then oxygen level becomes lethal. This species regulated
the oxygen consumption at lower rate at extreme high and low temperatures than
at intermediary optimum temperatures. The lethal oxygen level was much higher
at low temperatures, whereas it was the lowest at optimum temperature. The highest
lethal oxygen level at low temperature is attributed to the inhibition in oxygen
uptake. Cold-acclimated fish consumed more oxygen than the warm-acclimated
fish. The time to death was the highest at low temperature