Bluespotted grouper (Cephalopholis argus) changes coloring

   Body and head are dark brown, covered with numerous small blue spots of an eye shape with a black border. There are 5-6 pale transverse stripes along the back of the body. There is a large pale area on the chest. The back edge of the pectoral and pelvic fins usually has a narrow white edge. The arguments between males often resolve through visual signals. To resolve a dispute, they place one perpendicular to the other, to see each other well on the side and show the competitor their strength through rapid changes in colour: the winner is the one who gets the bigger contrast between the background colour of the body, that becomes black, and the changeable clear vertical bands on the back half of its body.