Bimodal oxygen uptake in a freshwater air-breathing fish, Notopterus chitala.

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Measurements of bimodal oxygen uptake have been made in a freshwater air-breathing fish, Notopterus chitala at 29.0±1 (S.D.) °C. The mean oxygen uptake from continuously flowing water without any access to air, was found to be 3.58±0.37 (S.E.) ml O2·h-1 and 56.84±4.29 (S.E.) ml O2·kg-1·h-1 for a fish weighing 66.92±11.27 (S.E.) gbody weight. In still water with access to air, the mean oxygen uptake through the gills were recorded to be 2.49±0.31 (S.E.) ml O2·h-1 and 38.78±1.92 (S.E.) ml O2·kg-1·h-1 and through the accessory respiratory organs (swim-bladder) 6.04±0.87 (S.E.) ml O2·h-1 and 92.32±2.91 (S.E.) ml O2·kg-1·h-1 for a fish averaging 66.92±11.27 (S.E.) g. Out of the total oxygen uptake (131.10ml O2·kg-1·h-1), about 70% was obtained through the aerial route and the remainder 30% through the gills.
日本魚類学会の論文