A 30-age class stochastic meta-population model was developed for silver perch, with 4 populations located along the main stem of the southern connected Murray-Darling Basin, including the Murray River and the Lower Darling River (below Menindee weir). The model accounts for survival, fecundity, and movement (immigration and emigration) in each population and includes the influence of flow and temperature on silver perch population dynamics. Estimates of age specific survival were derived from age-frequency data and fecundity was estimated from age-length-weight data combined with an established weight-fecundity relationship. Two 22 year flow and temperature data sets were assessed: 1) data from various gauges around the southern connected basin; and 2) an altered flow representing how environmental flows may have been allocated for the past 22 years. The silver perch dynamics response to the two flow and temperature data sets are presented and the implications for management.