Clove Oil as an Anaesthetic for Different Freshwater Fish Species

J. HAMACKOVA1, J. KOURIL1, P. KOZAK1 and Z. STUPKA2
1 University of South Bohemia Ceske Budejovice, Research Institute of Fish Culture and Hydrobiology at Vodnany, Czech Republic
2 University of South Bohemia Ceske Budejovice, Faculty of Agriculture in Ceske Budejovice, Czech Republic

Abstract

HAMACKOVA, J., J. KOURIL, P. KOZAK and Z. STUPKA, 2006. Clove oil as an anaesthetic for different freshwater fish species. Bulg. J. Agric. Sci., 12: 185-194

Results of experiments with clove oil utilization as an anaesthetic for fish realized in the University of South Bohemia Research Institute of Fish Culture and Hydrobiology at Vodxany are described. A series of observations was performed to evaluate the anaesthetic effects of clove oil on a broad spectrum offish species. In selected fish species, the effect offish size, temperature of aquatic environment, anaesthetics concentration and exposure time upon the anaesthetic effects were studied. Within the realized experiments, concentration of 0.03 - 0.05 ml.l-1 can be generally recommended for fish. The only exception are salmonids and sturgeons which need lower (0.02 - 0.03 ml.l-1) and higher (0.07 ml.l-1) concentrations, respectively. Exposure period between 2 and 4 min. is sufficient for full anaesthesia and is strongly dependent on water temperature.

Key words: anaesthesia, clove oil, anaesthesia phases, recovery, fish