no photo — written note
Insects
Aggressive crayfish with rusty thumbprint spots on each side.
Field facts
HabitatStreams, lakes, reservoirs
RangeSpreading statewide
When to lookActive April to October
StatusInvasive (Indiana DNR / IUCN Red List)
Look-alikesNorthern Crayfish, Native stream crayfish
Field note: It clips aquatic plants to bare stems and pushes out native crayfish.
Lesson
Watching responsibly
Never dump bait buckets; this species spread through Indiana that way.
Your records
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