The Pacific black crab eats seaweed as its staple food. It is generally distributed in the waters between 2 and 30 meters deep in the coral reef area of the western Pacific Ocean. It usually lives alone or in small groups in in muddy water areas.

In the case of artificial breeding, the water temperature of the aquarium needs to be between 24 and 27 degrees, and the minimum aquarium size is more than 450 liters. Eat some aquatic insect larvae, tadpoles, shrimp, larvae, etc.