Anesthetic induction of the aqueous extract of cunambí, “Clibadium Surinamense” linn to perform biometrics in tambaquis, “Colossoma macropomum”

SUMMARY Biometrics is an important step in the management process performed in fish during cultivation. However this practice exposes the fish to high levels of stress that can lead to weakness or even fish mortality. The use of natural anesthetic as cunambi, Surinamese Clibadium is an alternative to minimize the damage caused by handling during biometrics. For this we used three aqueous concentrations of plant extract (0.5, 1.5 and 2.5 ml/L). Individually they were exposed 3 fish (17,24g ± 14.01 and 9.18 ± 0,91cm) for each treatment and observed the time of anesthetic induction and recovery. After the anesthesia time the fish were weighed on an analytical balance and placed in aquariums free of the anesthetic solution to return to normal swimming position. After recovery, all subjects were monitored for 96 hours to observe the number of dead and later individuals analysis of optimal concentration. Treatment of 0.5 ml/L needed more time to reach the desired induction stage of deep sedation (7.4 minutes), however there was a significant difference at concentrations of 1.5 and 2.5 ml/L. The concentration of 0.5ml/L is ideal for the biometric management procedure and brief, because in spite of the delay in inducing fish to the different stages of anesthesia, causes a rapid recovery (8.62 minutes) in relation to other treatments 1.5 ml/L (16,6 min) and 2.5 ml/L (23.7 min).