Fiddler Crab (Uca sp.) Care Guide

A charismatic semi-terrestrial crab best known for the males' one oversized claw used for display and territorial signaling.

Overview

Uca sp. is a species in the family Ocypodidae. A charismatic semi-terrestrial crab best known for the males' one oversized claw used for display and territorial signaling. Requires a brackish paludarium with ample land area, as it spends most time out of water. Entertaining to watch during feeding and social interactions between males.

Taxonomy

Family: Ocypodidae
Genus: Uca
Scientific name: Uca sp.
Other names: Calling Crab
Origin: Worldwide tropical, Southeast Asia, Africa, Americas

Habitat

Uca crabs inhabit intertidal mudflats and mangrove margins of tropical coasts worldwide, including Southeast Asia, Africa and the Americas. Males bear one greatly enlarged claw used for display. They are semi-terrestrial and require brackish water plus dry land to thrive.

Tank requirements

Minimum tank volume: 40 L
Temperature: 22-28 °C
pH: 7.5-8.5
GH: 10-25 °dGH
Water flow: low
Adult size: 3-5 cm
Lifespan: 2-3 years
Difficulty: beginner

Diet

Classified as omnivore. Recommended feeding frequency: 1x daily. In captivity, offer a varied diet appropriate to the species — quality prepared foods supplemented with frozen or live items of suitable size.

Compatibility

Temperament: semi-aggressive
Position in tank: bottom
Compatible tank mates: Mollies, Other Fiddler Crabs
Avoid with: Freshwater Fish, Shrimp, Fully Aquatic Species