Other names: -
The signal crayfish is a freshwater crustacean native to North America, easily identified by its robust claws and a distinctive white or bluish patch at the joint of its claws. Introduced to Europe and other regions, it has become invasive, outcompeting native species. This hardy crayfish thrives in various aquatic environments and is a popular target for recreational fishing due to its tasty meat.
Other names
-
Length
~7" (max 20)
Weight
~0.06" (max 0.1)
Water
Fresh
Water Temp
20-25° F
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Signal crayfish prefer clear, well-oxygenated waters, often found in streams, rivers, and lakes
They seek out shelter in rocky crevices, burrows, and submerged vegetation to avoid predators
These crayfish are omnivorous, feeding on aquatic plants, insects, small fish, and organic debris
Active mainly at night, they forage close to their hiding spots, making them tricky to locate during the day
The mating season occurs in the fall, with females carrying fertilized eggs under their tails through the winter
Hatching occurs in late spring, with juveniles staying near their mothers before dispersing
As signal crayfish mature, they molt multiple times, growing larger with each molt
During the summer, they focus on feeding and molting, becoming less active as water temperatures drop in the colder months
