Great Lakes Crayfish

We need your help! Students and educators can become citizen scientists and help to prevent the spread of invasive species by catching, identifying and reporting crayfish. Add the crayfish species you find in your nearby freshwater ecosystems to this page to inform scientists of the biodiversity in your region.

Invasive crayfish are a major problem for the Great Lakes states. Each of the 39 native species of crayfish in this region each make up an important part of their food webs. However, invaders like red swamp and rusty crayfishes are diminishing these populations. New invasive crayfish populations are typically small and hard to detect, but their small populations also make them easier to manage. less ↑