Kenneth H. Johnston

Culture of Striped Bass

Prolarvae striped bass Roccus saxatilis (Walbaum) were brought to Oklahoma for experimental rearing in culture ponds. Postlarvae were stocked in ponds which were rich in plankton and later fed 246.5 pounds of prepared foods. Samples were taken periodically for detailed examination of growth and food habits. A preliminary examination indicated that prepared foods were utilized by these fish. The ponds were stocked with adult Tilapia and no small individuals of this species were found at the time of draining. The striped bass harvested after two months with a 15 to 60 percent recovery of the...

The Effects of Wind and Salinity Upon the Sedimentation Rates of Soils From Dredging Sites in Alabemarle Sound, North Carolina

Clay, loam, silt, and sand soil samples collected from dredging sites in Albemarle Sound were suspended in solutions of sea water varying from 0 to 25 per cent sea strength. Sedimentation rates were obtained by measuring the amount of light transmission through each solution as described by Coggin, 1960. Test suspensions were placed in a wind tunnel to determine the effect of wind action on sedimentation rates. Except for sand, no appreciable sedimentation of the suspended soils occurred in the zero concentrations of sea water during the entire test period. Rapid sedimentation of the...

Removal of Longnose Gar from Rivers and Streams with the Use of Dynamite

During the summer and fall of 1957, experiments with dynamite were conducted to determine an effective method of removing concentrations of longnose gar, Lepisosteus osseus, from the large coastal streams of North Carolina. A “suspended series” of charges was the most effective method tested. Charge of 3 sticks of dynamite, suspended at depth of 8 to 10 feet produced the best lethal range. Selective blasting with this method provided efficent removal of longnose gar. During one day's operation, over 3% tons of gar were removed while killing 8.3 pounds of game fish.