Rusty crayfish are native to the Ohio River drainage but have invaded lakes in Wisconsin and Minnesota in recent years. They were found in Sand Point Lake in 2006. Rusty crayfish are more aggressive than native crayfish and can eliminate native crayfish and aquatic plants, causing great change to the aquatic ecosystem of invaded lakes. Please do not move live crayfish from one lake to another, and remember that it is illegal to use live crayfish for bait in any lake in Voyageurs National Park.