Fig. 2 in Anesthetic activity of Brazilian native plants in silver catfish (Rhamdia quelen)

Fig. 2. Anesthetic effect of essential oils obtained from Lippia sidoides in silver catfish juveniles: a = Stage 2; b = Stage 3a; c = Stage 3b; d = Stage 4, according to Schoettger & Julin (1967). Maximum observation time for induction was 30 min. Data are presented as mean±SEM (N = 6). Different letters indicate significant differences among concentrations within each sample and * describes significant differences among samples (P<0.05).