Determinação da dose ótima de cloridrato de benzocaína na anestesia de tilápias (Oreochromis niloticus)

TL;DRAbstract

Fish anesthesia is indicated for several management procedures such as capturing, biometry, tagging, transporting, physical examination, reproductive management and surgical procedures. In this study the dose of benzocaine hydrochloride necessary for tilápia (Oreochromis niloticus) anesthesia was determined through six phases with 240 fish. In each phase 40 fish were evaluated. The interval between phases was two months. Mean values for weight and (allometric condition factor), in each phase, were 25.64 (2.56), 167.58 (2.88), 286.12 (2.57), 388.24 (2.50), 518.19 (2.89), 592.71 (2.67), respectively. The values for allometric condition factors showed that the animals included in the experiments were in good body conditions (P > 0.05). In each phase, fishes were captured and kept in four containers with five liters of water and benzocaine hydrochloride diluted in 20 mL of ethanol, in concentrations of 100, 140, 180, and 220 mg/liter of water. The time of induction in seconds (TI) was r

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