Fiddler Crab

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Fiddler crabs vary in color from tan to brown. Sand fiddler crabs are lighter than the other two species. Males have one enlarged claw that can grow to 1.5-2 inches long while females’ claws are equal size. The carapace (shell) is squared with rounded rear edges. The red-jointed fiddler crab’s shell has a groove behind each eye. Male marsh fiddler crabs have a royal blue spot on the center of the carapace, while male sand fiddler crabs have a blue or purplish shell. Shells vary in size from less than an inch wide to 1.5 inches wide. The marsh fiddler crab is the smallest fiddler crab in the Bay region and the red-jointed fiddler crab is the largest. Fiddler crabs have four pairs of walking legs.


Less than 1 inch to 1.5 inches in width


Feed on algae, bacteria and decaying marsh plants


Up to 2 years