Fig. 2. Amylase and maltase specific activities (mean ± s.d., n = 10) in the gut of jundiá catfish and Nile tilapia juveniles fed different plant sources. a,b,c,dDifferent letters indicate different means by Tukey test (P b 0.05). Vertical bars indicate standard deviation. Plant source: P = 0.5716 for amylase and P = 0.0451 for maltase; Fish species: P b 0.0001 for amylase and P b 0.0001 for maltase; Plant source × Fish species: P = 0.9202 for amylase and P = 0.0076 for maltase.