Renal excretion in channel catfish following injection of quinaldine sulphate or 3- trifluoromethyl-4-nitrophenol

Channel catfish, Ictalurus punctatus Rafinesque, injected intraperitoneally with 2-methyl-quinoline sulphate (QdSO₄) or 3-trifluoromethyl-4-nitrophenol (TFM) eliminate most of the dose of these compounds by extra-renal routes. Patterns of renal excretion of Na⁺, K⁺, Ca²⁺, Mg²⁺, and Cl⁻ (ρEq kg⁻¹ h⁻¹) appeared to be associated with the 'stress' of the urine collection technique rather than with the elimination of either compound. Concentrations of Na⁺, K⁺, Ca²⁺, Mg²⁺, and Cl⁻ (mEq/1) were determined in urine, plasma and gall bladder bile.