Violet Sesarma Crab

The Violet Sesarma Crab refers to purple-violet coloured sesarmid crabs traded under this common name, principally belonging to the genus Sesarma or closely allied genera from tropical Asia. These crabs display attractive violet-to-purple pigmentation on the carapace and legs, often with darker lateral margins and paler ventral surfaces.

In their natural habitats — mangrove edges, forest stream margins, and coastal scrub — Sesarma crabs are semi-terrestrial omnivores, foraging on leaf litter, detritus, algae, invertebrates, and fallen fruit. In captivity they thrive in a well-structured paludarium providing both a terrestrial land area and a shallow water section. Depending on the exact origin species, the water may be freshwater or slightly brackish.

These crabs are generally hardier and more adaptable than many paludarium crabs, making them suitable for hobbyists with some invertebrate experience. They are active foragers and will consume Indian almond leaf litter eagerly. Groups can be maintained in appropriately sized enclosures with multiple hides. Breeding larvae typically require salt water, but the semi-terrestrial adult phase is easily maintained.

Water: 22–28°C, pH 7.2–8.2, GH 6–18, KH 3–12; freshwater to mildly brackish; shallow water section. Tank: minimum 50 L paludarium; moist substrate, cork bark, leaf litter, moss; 50–60% land; secure escape-proof lid. Feeding: omnivore — dried leaves, blanched vegetables, dried shrimp, sinking pellets, algae; feed every 1–2 days. Breeding: larvae typically require brackish to marine conditions; captive rearing not practical. Compatibility: small mixed groups; semi-terrestrial; incompatible with shrimp; avoid with small fish.