Abstract
1. 1. Red cell fragilities were determined over a period of 7 days for a.c. electronarcotized, d.c. electronarcotized and benzocaine hydrochloride anaesthetized Oreochromis mossambicus. Marked differences in osmotic fragilities were apparent between the different treatments. 2. 2. Although a.c. electronarcosis and chemically anaesthetized fish showed only slight shifts in mean cell fragilities (MCF) with time, d.c. electronarcosis produced major shifts in this parameter after 7 days. 3. 3. A.c. electronarcosis and chemically anaesthesia resulted in similar fragility patterns with red cells becoming less fragile over 24 hr and subsequently returning to normal levels. 4. 4. The results indicate that a.c. electronarcosis compares favourably with benzocaine hydrochloride as an anaesthetic in O. mossambicus.
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