Thomas D. Bryce

Distribution of Freshwater Bivalves in the Canoochee River Drainage, Georgia

The Canoochee River originates in the Southern Coastal Plain of Georgia and flows through the Coastal Flatwoods to terminate at the Ogeechee River. The Canoochee Drainage is the largest tributary of the Ogeechee River and is a fifth-order woodland stream. Investigators surveyed 83 sites for freshwater bivalve presence, noting species and counting individuals. We analyzed water chemistry parameters including nitrate nitrogen, total inorganic nitrogen, total dissolved phosphate, and total dissolved copper. Multiple linear regression (MLR) analysis indicated mussel densities and catch per...


Age, Growth, and Status of Shortnose Sturgeon in the Lower Ogeechee River, Georgia

Shortnose sturgeon (Acipenser brevirostrum) were monitored as part of continuing studies in the Ogeechee and Canoochee rivers adjacent to Fort Stewart, Georgia, during 1999 and 2000. Over 13,000 net-meter h soak time and 1,700 person h of effort were expended; short (27.5-m) experimental gill nets were a satisfactory sampling gear. Retention of externally mounted telemetry tags was poor (mean = 80 d), and spawning habitats were not located. The population, ranging from ages 3 to 14, was estimated at 147 individuals. Growth equation parameters and rates of mortality were similar to those...


Dimorphic Growth Patterns on Scales of Striped Bass and Morone Hybrids from a Central Alabama River

Striped bass (Morone saxatilis) and Morone hybrids were studied in the Tallapoosa River downstream of Thurlow Dam from March through November 1980. Age and growth analysis revealed that over 80% of the striped bass scales had numerous false annuli, while none were observed on Morone hybrid scales. The presence of false annuli indicated interruptions in normal growth during the mid- to late-summer period. These interruptions were attributed to striped bass preferential selection of cooler water temperatures in mid-summer. The striped bass are believed to spatially separate themselves from...