1. Appearance: Black-headed fish has a rectangular body with black scales on its surface, hence the name "Black-headed fish". The body of the grouper is rectangular, covered with gray or brown scales and with black spots, hence the name "Grouper".

2, living habits: Blackhead fish live in the deep sea, like to find food in coral reefs, rock crevices and other places on the seabed, is a benthic fish. Grouper lives in shallow waters in coastal areas and likes to find food in coral reefs and rock crevices on the seabed. It is a benthic fish.