1. 1. The effects of alternating current electronarcosis, rectified current electronarcosis and chemical anaesthesia (benzocaine hydrochloride) on plasma electrolytes and on the osmotic pressure of the blood of the freshwater bream Oreochromis mossambicus were evaluated. 2. 2. Plasma Ca2+, Na+and K+concentrations and the osmotic pressure of the blood were monitored over a period of 7 days. 3. 3. The results showed that the different electrolytes respond differently to the different techniques. 4. 4. Chemical anaesthesia exhibited the least effects on the parameters studied. © 1991.
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