Anaesthetic baths (whether induction, surgery table
or recovery) should be changed when the temperature
varies fromambientwater temperature bymore than 2C_ ,
when the bath becomes noticeably frothy or cloudy, or
when reduced water quality is suspected due to excreta,
blood or other bodily fluids (Summerfelt and Smith
1990; Portz et al. 2006). Anaesthetic baths also should
be changed when induction or recovery times are
noticed to increase or decrease, respectively.Changes in
induction and recovery times occur due to the decay of
clove oil within the induction bath as it becomes
metabolized or diluted with the physical movement of
fish into and out of the induction bath (Summerfelt and
Smith 1990; Burka et al. 1997; Schoettger 1967).