Welcome to My Fishing Pals. Glad to have you aboard!
Big Stone Lake is well known for its walleye. It is the site of one the MWC (Master Walleye Circuit) Tournament out of Lakeside Park in Ortonville.
It seems the DNR for both Minnesota and South Dakota cooperatively stock Big Stone Lake with 6 million walleye fry every other year. The lake contains more than 30 other species of fish including northern pike, large-mouth bass, bluegill, black crappie, white crappie, bull head, channel catfish and perch. It is considered prime waters for fishing by both Minnesotans and South Dakotans (did I say that right?)
A good place to fish is the Pier in Ortonville.
Hope that helps you out! Come back and tell us how ya did...