Bobby G. Grinstead

The cove rotenone sample technique was used to estimate standing crop of fishes in the 23 reservoirs selected for the Predator Stocking Evaluation (PSE). Estimates ofadjusted standing crops were derived by expanding the observed standing crop of fish in a cove sample by compensation factors for incomplete recovery of fish in the sample and for different shoreline-open water distributional patterns of various fish species and size groups. Results of 138 rotenone samples indicated that the mean adjusted standing crop of fishes in the PSE reservoirs was 451.1 pounds per acre, an increase of...

The catch of commercial and game fish with 4-foot trap nets having minimum mesh sizes of 0.5,2, and 3-inch, square measure, were compared. A small trap net having 0.5-inch webbing in the crib has been used for many years to sample fish from Oklahoma reservoirs. Various investigators have indicated that this gear has potential as a commercial fishing device. However. large catches of game fish, especially white crappie, was a serious detriment to this potential. Two designs of large mesh trap nets were therefore dcveloped to determine if by enlarging the mesh size of the standard design,...

A study to determine the relationship of the interval of time between lifts and the catch of ten-foot Wisconsin-type trap nets was included as a segment of an investigation designed to determine the potential of utilizing trap nets as a commercial fishing device in warmwater reservoirs. Data obtained from the catch of 170 trap net lifts, which varied in interval of time between lifts from one to seven days, indicate that with an increase in the interval of time between lifts, the total catch increased while the catch per net day decreased. A logarithmic curve Y = 73.866 + 235.229 log X...

The first phase of a study to determine the potential of otter trawls as commercial fishing gear in the warmwater reservoir was investigated. The research was conducted on Wheeler Reservoir, Alabama, during September, October and December, 1967. Two 37-foot and two 45-foot otter trawls constructed from three designs were investigated utilizing a systematic sampling schedule in which direction, speed and duration of tow, and length of warp were randomly selected. Two areas of Wheeler Reservoir, an expanse of open water in the main body and two smaller areas in the Elk River arm, were...

Wisconsin-type trap nets were investigated to determine methods necessary to adapt this gear to TVA reservoirs, to establish the best operational procedure, and to determine the potential of this gear in an expanded commercial fishery. The study was conducted primarily in Wheeler Reservoir, Alabama. Three trap nets, modified in amount of flooring, mesh size, and floatation, were fished in combination with three lengths of lead. The lead of intermediate length was constructed of a smaller mesh size (4- instead of 5-inchl than the shorter and longer leads. Modifications which resulted in...