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Red claw crab (Perisesarma bidens)
AI illustration, not an ID reference

Red claw crab

Perisesarma bidens

InvertebratesFreshwater

Care level
Moderate
Temperament
Semi-aggressive
Recommended tank
60 L
Maximum size
5 cm
Temperature
22–28 °C
pH
7.5–8.5
Diet
Omnivore

Care at a glance

The red claw crab isn't really a freshwater animal, despite often being sold as one: it's a semi-terrestrial brackish-water crab from Southeast Asian mangrove coasts, recognisable by its purplish-brown body and bright red claws.

For it to thrive long term it needs access to land where it can dry off and breathe air, plus slightly brackish rather than pure fresh water — a tank with no land or climbing area isn't a sustainable setup. It climbs and jumps well, so fit a tight lid, and keep it alone or in a small group with plenty of hiding spots, since it's territorial towards its own kind.

Good to know

  • Territorial
  • Digger — needs fine sand
  • Known jumper — cover the tank
  • Preys on shrimp and snails

Related species

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Values are mainstream hobbyist guidance, not gospel — always watch what your own animals need.