Growth and Survival of Juvenile Striped Bass (Morone saxatilis) x White Bass (M. chrysops) Hybrids Reared at Different Salinities

The striped bass (Morone saxatilis) x white bass (M. chrysops) hybrid is widely stocked to support recreational fishing and is of interest as a commercial aquaculture candidate. Nevertheless, there is little information concerning the relative performance of these hybrids in various salinities. A replicated 126-day study compared growth, survival, standing crop, and feed conversion ofjuvenile hybrid bass (mean size 5.8 g) reared under controlled conditions at 0, 7, 14,21, 28, and 35 ppt salinity. Results indicated that growth was similar at all salinities and that fish survival was high (mean 91.7%) at all salinities except 35 ppt where survival was 60.0%. Feed conversions averaged 1.7 using a pelleted feed and average standing crop was 11 kg/m' for salinity treatments 0, 7, 21, and 28 ppt. Standing crop was 6.7 kg/m' at salinity 35 ppt due to the lower survival rate. A disease outbreak resulted in loss of all fish reared at 14 ppt after day 105. However, up until that time survival was 100%.

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