Fig. 7.a. Relationship between fish standard length and otolith radius for Brachyplatystoma rousseauxii below 80 in Age and growth of the Amazonian migratory catfish Brachyplatystoma rousseauxii in the Madeira River basin before the construction of dams

Fig. 7.a. Relationship between fish standard length and otolith radius for Brachyplatystoma rousseauxii below 80 cm (black circles, black line: y = 0.031x + 0.209, r² = 0.805, P <0.001) and above 80 cm (white triangles, broken line: y = 0.034x – 0.223, r² = 0.328, P <0.001); and b. relationship between fish age and otolith radius for B. rousseauxii below 80 cm (black circles, black line: y = 0.887ln(x) + 1.567, r² = 0.879, P <0.001) and above 80 cm (white triangles, broken line: y = 0.209ln(x) + 2.055, r² = 0.822, P <0.001), both in Madeira River basin.