author(s)
Jay Narayan Shrestha and Samjhana Shrestha

abstract
Oxygen uptake is a valid measure of metabolism on which production of aquaculture depends. The weight specific oxygen uptake in Olyra longicaudata was still unknown. So, the fishes were collected from Chisang river basin, Letang from February to July, 2019. Oxygen uptake rate of the fishes was carried out in laboratory of Post Graduate Campus, Biratnagar conducted by the cylindrical glass respirometer with the aim of estimating oxygen consumption. Data were analyzed from logarithmic transformations of body weight and oxygen uptake expressed by the allometric equation. The total oxygen uptake increased with increasing body weight by a power of 0.580. There was positive correlation coefficient equal to 0.9586 (p<0.01). The weight specific oxygen uptake declined with increasing body weight by power of 0.419 with correlation coefficient equal to 0.9252 (p<0.01). The study was concluded that the specific metabolic rate is higher in smaller than in larger fishes.