W. L. Shelton

A radio-telemetry study was conducted to determine spatial and temporal movements of adult striped bass (Morone saxatilis) in the Jones Bluff section of the Alabama River. Five fish were successfully implanted with radio transmitters during the summer of 1981 and the spring of 1982. These fish made extensive use of the Thurlow Dam tailwater on the Tallapoosa River. The fish arrived at Thurlow Dam in the spring when temperatures ranged from 16° to 17.5° C and left the tailwaters in late fall and early winter when water temperatures decreased to 19.5° and 18.5° C in 1981 and 1982...

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...

Genotypic male Tilapia aurea, previously treated for sex reversal to a female state, and their sex-reversed female (F') parent were stocked into aquaria with untreated females at various ratios. The reproduction of the 2 types of females with normal males was compared. None of the treated fish spawned; most were later found to have ovotestes. The PI sex-reversed female spawned repeatedly after she was paired with a male in a larger tank, indicating that the presence of normal females under confined aquarium conditions may have a repressive effect upon estrogen sex-reversed females.

A method of sampling fish populations in the littoral area of reservoirs was developed to estimate the number and standing stock of young-of-the-year (YOY) and adult fishes in West Point Reservoir, Alabama-Georgia. A surface area of 0.0 I ha was surrounded with a net (30.5 m x 2.7 m) and the fish were poisoned with rotenone. The sample sites were chosen randomly by using a grid system. The average monthly standing stock (kg/ hal from April to September 1977 ranged from 74.2 in September to 126.1 in June. The weekly samples yielded data that enabled us to estimate the reproductive success...

The species composition and relative abundance of fishes in West Point Reservoir, a main stem Chattahoochee River reservoir, changed after impoundment in 1975. Strong year classes of gizzard shad, threadfin shad, largemouth bass, black crappie, bluegill, brown bullhead, carp, bowfin, and many sunfishes were produced in 1975. Sixteen species disappeared from the present reservoir region; 11 were not collected after impoundment, and 5 others disappeared during the first year. Forty-three species were found in the reservoir 2 years after impoundment, of which 6 did not occur in preimpoundment...