Replication Data for: Reproductive investment in the knifefish Brachyhypopomus occidentalis

This dataset contains morphological and reproductive data from Brachyhypopomus occidentalis collected across four populations in two river drainages with differing predation risk levels. Measurements include body size, gonad mass, fecundity, oocyte stages, and sexual dimorphism. The data were used in statistical analyses for assessing the effects of predation risk on reproductive investment.