The effect of temperature on clove oil anesthesia in Nile tilapia (Oreochromis niloticus)

Sirinnapa Poomjae and Sathit Boonnom

ABSTRACT: The purpose of this study was to investigate the effect of temperature on anesthesia in Nile tilapia (10.51 ± 3.38 g, 8.56 ± 1.13 cm) with clove oil. Fingerlings were individually exposed to six different concentrations (25, 50, 75, 100, 125 and 150 mg/L) at two different temperatures (26 and 30 ºC). The induction and recovery times and water quality were examined to determine the lowest effective concentration. Fingerlings were individually subjected to the lowest effective concentration to evaluate the effect of temperature on the opercular movement. The concentration of 25 mg/L was inefficiency to induce the anesthesia at all temperatures. As the temperature and concentration increased, the induction time decreased (P < 0.05). Conversely, the recovery time decreased (P < 0.05) as the temperature increased and the recovery time increased (P < 0.05) with increasing concentration. In addition, the rising temperature declined (P < 0.05) the dissolved O2, whereas the dissolved O2 elevated (P < 0.05) with rising concentration. The lowest effective concentration at 26 and 30 ºC was indicated to be 100 and 75 mg/L, respectively. At these concentrations, the opercular movement rate was rose (P < 0.05) with increasing temperature. This study demonstrates that the temperature had an effect on the efficacy of clove oil as an anesthetic in Nile tilapia.

Keywords: temperature, anesthetic, clove oil, Nile tilapia

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