Abstract
Oxygen uptake through gills and the swim bladder in relation to body weight have been measured in Notopterus notopterus at 24.5±1.0 oC, using closed glass respirometer. With increase in body weight from 4.90 to 90.00 g, the rate of oxygen uptake per unit time (ml O 2 h -1 ) increased from 1.520 to 4.113, 0.994 to 3.033 and 2.514 to 7.146 mlO 2 h -1 through air, water and air+water respectively. The slope ‘b’ of the regression line for oxygen uptake per unit time in relation to body weight from air, water and total (air+water) were found to be 0.318, 0.403 and 0.350 respectively. The relationship has been found highly significant. The weight specific oxygen consumption in relation to body weight mlO 2 kg -1 h -1 from air, water and air + water decreased from 309.750 to 45.700, 202.825 to 33.770 and 512.575 to 79.400 mlO 2 kg –1 h –1 respectively with gradual increase in the body weight from 4.90 to 90.00 g. The log-log plot between the two variables gave straight lines with the slope ‘b’ of-0.618, -0.597 and-0.649 through air, water and air+water respectively. It has been estimated that a N. notopterus having average body weight of 29.01 g, extracted about 63% of oxygen from aerial route while only 37% through its aquatic route. Key words : Air-breathing fish, Notopterus notopterus , bimodal oxygen uptake
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