The 3,225-acre Lake Arthur is a warm-water fishery. Common species are northern pike, largemouth bass, channel catfish, black crappie and bluegill. The Pennsylvania Fish and Boat Commission stocks muskellunge, walleye, channel catfish and hybrid striped bass. Pennsylvania Fish and Boat Commission laws apply.
Volunteers, park employees and Pennsylvania Fish and Boat Commission employees have installed fish habitat structures throughout the lake. A map showing fish habitat project locations, water depths and specific features of the lake is available at the park office, marina office and the gift shop at McDanels Boat Launch.
ADA accessible fishing piers are at Bear Run Boat Launch, Park Road Boat Launch and McDanels Boat Launch, which also are great spots for children to fish.