Production of Phase I and II Hybrid Striped Bass in Mississippi

Nine-day-old hybrid striped bass (Morone saxatilis x M. chrysops) were stocked into fertilized O.04-ha freshwater ponds at 3 densities with 3 replications each and fed a 55% crude protein feed at 0.45 kg/day/pond divided equally into 4 daily feedings for 33 days. There were no significant (P > 0.05) differences for average weight gain or survival among the densities: 123,500 fishlha, 1.2 g, 57.4%; 247,000 fishlha, 0.7 g, 41.2%; and 370,500 fish/ha, 0.8 g, 31.8%. Fingerlings averaging 0.75 g were subsequently stocked into 0.04-ha fresh water (alkalinity ca. 100 mglliter, hardness 42 mg/liter as CaC03) ponds at 37,050/ha and 74, loo/ha (3 replications each). Brackish water (4-5 ppt) O.I-ha ponds were stocked with fingerlings averaging either 0.6 g or 1.4 g (3 replications each) at 9,880/ha. Fish were fed a 38% crude protein feed at 5% of body weight and were sampled monthly for 5 months. Fish stocked at 37,050/ha were significantly larger (83.6 g) than those stocked at 74,100/ha (66.0 g), but there were no significant differences in feed conversion or survival. Survival in brackish water was significantly less for the smaller fish (80.4%) than for the larger fish (102.0%), but there were no significant differences in final average weight or feed conversion.

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