You record every fish you catch, not every fish in the lake. Use different angling methods. Once you catch 15-25 bass and get their lengths. Quit fishing for bass and fish for other species. Use light line (4lb) and live bait if the water is clear. Your goal is to catch and measure as many different fish species as you can.
You have a depth finder?. If not buy a used one on ebay. Learn the bottom contours and structure in the lake. Add and strategically place some of the homemade structures shown in the Archives. Artificial structure will concentrate the fish in to smaller areas to fish around. Locate your hidden structure with GPS and depth finder. A wide variety of fish species will use the structure.
In a lake this size you will very rarely if ever catch the same fish twice. You can mark the fish you catch using the fin clipping method of marking fish if you think you are catching the same fish.
https://www.bassresource.com/fish_biology/fin-clipping.html 
