Striped bass ( SB; Morone saxatilis ) and their hybrids (HSB) are currently cultured in freshwater ponds throughout the southern US as a food and gamefish. The industry currently ranks 4th in domestic finfish production where HSB rather than pure SB are more often produced because they are thought to have accelerated growth rates and a greater stress tolerance. No studies to date, however, have conducted direct comparisons of HSB to SB over a range of conditions with controlled genetic crosses. In this effort, families of SB and HSB were spawned using domestic and wild broodstock, PIT tagged, and grown together (“common garden”) to market size (~1 kg) in recirculating aquaculture systems. Fish were genotyped for parentage and stocked into 2 recirculating systems (three x 1,500 L tanks; 15 fish/tank) connected at the sumps. Each tank received 1 wild Texas SB, 2 domesticated SB, 3 wild sunshine HSB (Texas male), 3 domestic sunshine HSB (domestic male) , and 6 domestic palmetto HSB (domestic female) allowing for comparisons among multiple half-sibling families. Systems were maintained at 18 °C for a two-week acclimation period post stocking before all fish were netted from tanks , immediately transferred to a bath of AquacalmTM (metomidate hydrochloride) and bled to determine baseline plasma cortisol levels. Fish were returned to tanks and then raised at 18, 24, and 30 ° C for one month at each respective temperature. The fish were fed daily to satiation and amounts recorded to calculate FCR while visually observing behavior among crosses . After the 18 and 24 °C, rearing periods, the fish in all tanks were subjected to a 1-minute net chasing stressor and then three tanks were bled one hour post stressor to measure peak cortisol concentrations . After the final month at 30 ° C, the fish in all tanks were chased, bled, measured, and survival monitored for an additional week. Survival (> 90%) and % weight gain (~26%) w ere similar for SB and HSB crosses . Plasma cortisol levels and additional growth data will be presented but these results indicate no differences in performance among purebred and HSB in simulated commercial conditions.