Common name: Harlequin Crab

General information

The Ornate Swimming Crab, Lissocarcinus laevis, is a small and colorful crab species that is occasionally found in the aquarium trade. It is known for its flattened, paddle-like rear legs which aid in swimming, and its striking pattern of spots and lines on the carapace and limbs. This species is not as commonly kept as some other invertebrates, but it can be a fascinating addition to a reef or fish-only aquarium due to its unique behavior and appearance.

Care

Lissocarcinus laevis requires a well-established aquarium with plenty of live rock and a sandy substrate to mimic its natural habitat. They are generally peaceful and can coexist with a variety of tank mates, but they may prey on small, slow-moving fish or invertebrates. A varied diet of meaty foods, such as chopped fish, shrimp, and squid, is essential for their health. Care should be taken to ensure that they do not become outcompeted for food by faster, more aggressive feeders.

Reproduction

In the wild, Lissocarcinus laevis breeds by releasing eggs into the water column, which then develop into planktonic larvae. In the aquarium, breeding is rare, but with optimal conditions and a well-maintained environment, it is possible to observe larval development.

Symbiosis

While not known for any specific symbiotic relationships in the aquarium setting, in the wild, Lissocarcinus laevis is often associated with sea cucumbers, living commensally and gaining protection by staying close to their host.

Habitat

This species is found in the Indo-Pacific region, from the Red Sea and East Africa to the central Pacific. They inhabit coral reefs and sandy areas, often associated with sea cucumbers, and can be found at depths ranging from shallow waters to about 30 meters.