Mercer County offers exceptional freshwater fishing opportunities across its diverse waterways, highlighted by Mercer Lake's thriving bass populations. This 181-acre lake features a maximum depth of 24 feet and hosts muskellunge, walleye, northern pike, and both largemouth and smallmouth bass. Anglers find prime bass spots near shaded cover, structures, and points within the Dowell and Dahlin arms, responding well to soft plastics, jigs, and swim baits.

Beyond Mercer Lake, the county's park system provides access to Rosedale Lake, Curlis Lake, and the trout-stocked waters of Stony Brook. The Delaware River borders the county and delivers seasonal runs of shad, herring, and bass, while Spring Lake at Roebling Park offers convenient shoreline fishing access. Multiple public boat launches like the Mercer County Park Marina ensure easy water entry, with sailing also popular on Mercer Lake.

Noted for its exceptional panfish populations including bluegill and yellow perch, Mercer County provides varied angling experiences across interconnected waterways. The region's well-maintained parks system offers comprehensive fishing access points, creating ideal conditions for both novice and experienced anglers throughout the year.