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The aim of this study was to identify the times of anesthetic induction and recovery in common carp (Cyprinus carpio) with average body weights of 11.59 ± 1.23 g, at water temperatures of 23EC that were exposed to the spearmint (/-Carvon) oil and methyl salicylate oil emulsion (CMSE). Common carp were placed in 1-L aquaria containing different concentrations of CMSE (263, 395, 526, 658 and 789 μI/L). The different treatments resulted in average induction and recovery times ranging from 80.33 ± 5.13d s to 305.67 ± 21.13 s and 87.67 ± 19.39 s to 194.33 ± 27.09 s, respectively. Induction and recovery time decreased significantly with increasing of the concentration of CMSE (P<0.05). Opercular rate firstly increased and then slowly decreased with increasing the concentration of anesthetic. Glucose levels were significantly affected by CMSE concentration (P<0.05). Lower levels of plasma glucose after anesthesia and recovery belong to treatment of 526 μI/L. A second experiment was conducted in which common carp were immersed in either 526 μI/L CMSE or 150 mg/L clove powder in order to compare them with each other. Induction was quicker in the CMSE group; however, recovery was quicker in the clove powder group. Also, lower levels of plasma glucose and opercular rate belong to CMSE. No mortality was observed in the study. Applications of CMSE in 526 μI/L level, seems to be suitable on anesthesia of common carp.

The Effects of Stocking Density on the Growth and Survival of Nile Tilapia (Oreochromis niloticus) Fry at Son Fish Farm, Uganda