investigated at four concentrations (15, 30, 45, and 60 ppm), three water
salinities (10, 20, and 30 ppt) and three temperatures (20℃, 24℃,
and 28℃). The anaesthetic effect of the combination of two anaesthetics,
clove oil and lidocaine-HCl (Sigma, MO, USA) was examined at three
concentrations of clove oil (15, 30, and 45 ppm) and three concentrations of
lidocaine-HCl (400, 500, and 600 ppm) at 24℃ and 30 ppt. Fish were
exposed to different combinations of salinity, water temperature and anaesthesia
concentrations. The stock solution clove oil was dissolved in 95% ethanol
(Sigma, MO, USA) at a ratio of 1:10 (
& Heath, 2000
effect on fish (
1997
1,000 ppm NaHCO3 (
1998b
effect.
Exposure time was measured from the time when samples were transferred from a
stock tank to an anaesthetic-containing aquarium (30 L) to when they reached A5
(
measured between the time when the anaesthetized samples were transferred to a
sea water tank containing 30 L with sufficient aeration and the time they
reached R6 (