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SD Least Wanted.comAquatic invasive Species

SD Least
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rusty crayfish


Illinois, Indiana and Ohio


Rusty Crayfish are similar to native crayfish. They can be distinguished by their large black tipped claws and the rusty spots on the back of their torso. They range in length from 2-8 inches.


Rusty crayfish can force out or completely replace native crayfish, and can destroy plant bed abundance and diversity.

Range Expansion:

This species is primarily spread through inadvertent introductions by anglers. Females carry fertilized eggs, so a single release can start a population.

South Dakota Distribution: