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The effects of valerian, Valerian officinalis, and clove, Eugenia caryophylla, extracts as anesthetic chemicals were investigated on Panga siussutchi (12.95±0.92 mm, 16.85 ± 3.52 g). The fish were divided in 6 groups, each including 5 individuals and exposed to various concentrations (2, 3 and 4 g/lit) of clove and/or valerian extract. The mean time to induce sedition, the mean time to return and the mean number of opercular gill pulses to sedate and recover were measured. For both groups, the mean time to sedation was decreased by increasing the dose of the extract. In general, the mean time to onset of anesthesia for clove group was significantly lower than valerian. The mean number of opercular gill pulses during the sedation time was not significantly changed between different dose of clove, while it declined significantly by elevating the valerian doses (p<0.05). There was no mortality in both groups. Although V. officinalis extract could cause sedation in the fish, it needed relatively longer time to affect than clove, so it may not be a useful compound for sedation in P. siussutchi.

Keywords: Pangasius sutchi, Valerian officinalis, Eugenia caryophylla, anesthetize

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