The signal crayfish is a robust freshwater crustacean identifiable by its large claws, marked with a distinctive white or pale patch at the joint, resembling a signal. Native to North American streams and rivers, it typically grows up to 6 inches in length and weighs a few ounces. It is known for its aggressive and territorial behavior, often occupying burrows or crevices and feeding on a varied diet of plants and small aquatic organisms. This summary is AI generated
Water type
IUCN Status
Threat to humans
Source: Fishbase
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Signal crayfish
length · weight
Signal crayfish
4 in · 2 oz
Signal crayfish
Washougal Waterfront Park (Columbia River)
4 in · 3 oz


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