Acmella oleracea RK Jansen

Essential oils from inflorescences (AOOi) and leaves (AOOl) of Acmella oleracea. Silver catfish exposed to 20 mg L- 1 of AOOi took longer to reach stages S2, S3a and S3b than those subjected to 80 and 100 mg L- 1. Furthermore, 80 mg L- 1 took less time to reach S4 than those subjected to 20 and 100 mg L- 1. Only fish anesthetized with 20 and 80 mg L- 1 recovered within the 30 min evaluation time (Tab. 4). Considering the AOOl concentrations evaluated, the time to reach the S2 stage was inversely proportional to the increase in concentration. The concentration of 100 mg L- 1 took longer to reach the anesthetic stage (S4) than 50, 200 and 300 mg L- 1. However, the concentration of 100 mg L- 1 was the one that recovered in the shortest time compared to the concentrations of 200 and 300 mg L- 1. However, it did not differ from 50 mg L- 1 in terms of anesthetic recovery time (Tab. 4).