Red Rock Crab
Scientific Name: Cancer productus
Category: other
Brief Description
A medium-sized marine crustacean known for its thick, bright red shell and powerful black-tipped claws, commonly found in Pacific Northwest tide pools.
Characteristics
Heavy, brick-red carapace in adults (juveniles may have varied patterns). Broad, flat carapace with scalloped edges. Large, powerful claws with distinct black tips.
Habitat
Intertidal and subtidal zones including rocky areas, reefs, and beds of eelgrass or kelp. Often hides in crevices or under rocks.
When to Find It
Can be observed year-round, most easily during low tide events.
Conservation Status
N/A
Ecological Role
A major predator of small invertebrates like barnacles, snails, and other crabs, helping control their populations. It also serves as a food source for seals, octopuses, and larger fish.
Easily Confused With
Dungeness Crab (Metacarcinus magister): Dungeness have white-tipped claws and a more tan/purple-brown shell. Red Rock Crabs have black-tipped claws and a much deeper red color.
Observation Tips
Look in tide pools and under rocks at low tide. Use a flashlight to see into crevices. Be cautious: they are much more aggressive and have a stronger pinch than Dungeness crabs.
Interesting Facts
Juvenile Red Rock Crabs are often white, striped, or mottled, providing camouflage before they transition to their solid red adult coloration. Their claws are strong enough to crush the shells of thick-walled snails.
User Notes
Washington state beach