The algae-eating tropical fish of the Indian Ocean black crab likes to eat seaweed, The maximum size is 40cm. The adult Indian Ocean blackfish has a dark short horizontal spot just behind the eyes and at the tail spine, and the young Indian Ocean blackfish with a body length of less than 5cm does not have any Horizontal spots, the sub-adult Indian Ocean black fish with a body length of less than 10cm has no markings on the tail spine. During the night, the body color of the Indian Ocean black crane will turn blue-gray.

The Indian Ocean black scorpion is a species of Fish are generally distributed in tropical waters, inhabiting open coral reef areas and sea areas with a water depth of 1-40 meters in rocky reef areas, and usually live in large groups. The body of the Indian Ocean black fish tends to be oval, black as a whole, with a white vertical band on the caudal fin, and blue margins on the terminal, dorsal and anal fins.