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Fishery and Sea Resourcesstagecharacteristic0 physiological position; normal locomotor activity, normal opercular rate1physiological position, decreased locomotor activity, slight increased inopercular rateInduction2physiological position, increased locomotor activity, very high and erraticopercular rate3slight tilting on the flank, uncoordinated locomotion, decreased locomotoractivity, high and erratic opercular rate4 flank position, immobilization, low opercular rate5 back position, immobilization, breathing stopped0 flank position, immobilization, low opercular rateRecovery1slight tilting on the flank, uncoordinated locomotion, low locomotor activity,slight increased in opercular rate2 physiological position, increased locomotor activity, increased opercular rate3 physiological position; normal locomotor activity, normal opercular rateTable 1: Stage and phases of physiological responses caused by the anaesthetics, duringthe anaesthesia induction and recovery. Data from Trzebiatowski et al. [22] modified bythe authors.1946