What are Rusty Crayfish
Rusty crayfish are crustaceans that grow up to 5 inches long. They are native to the Ohio River basin. Rusty crayfish have spread to several states and Ontario. They were discovered in Minnesota around 1960 and are confirmed in about 50 Minnesota waters, mostly in central and northern counties. They are often used as bait and it is suspected that they spread through dumping of bait buckets.
Rusty crayfish are aggressive invaders that often displace native crayfish. They are an opportunistic feeder, which means they eat almost anything, including plants and small fish. They can harm native fish communities by feeding on their eggs and young, drive out or hybridize with native crayfish, and eliminate aquatic vegetation.
They also have a higher metabolism and grow larger then native crayfish. This combination results in a larger appetite then the native crayfish.
Consider a donation to the Invasive species fund, to treat our lake.