Fig. 5 Comparison between eDNA and traditional electrofishing methods (TEF) at the 18 common sites sampled by both methods. Regressions (type II) of teleo-eDNA concentration (mitochondrial DNA copies/L) on fish biomass (Fig. 5a) and fish density (Fig 5b) estimated by TEF. Regressions (type II) of species-specific eDNA concentration on species-specific biomass (Fig 5 c) and species-specific density (Fig 5d).