Scissortail sergeant - Abudefduf sexfasciatus
The Scissortail Sergeant, (Abudefduf sexfasciatus) family Pomacentridae is a large damselfish. It earns its name from the black-striped tail and sides, which are reminiscent of the insignia of a military Sergeant. It grows to a length of about 16 centimetres. Pesce Sergente Scissortail sergeant Abudefduf sexfasciatus intotheblue.it 
Scissortail sergeants live on coral reefs at depths of up to 15 metres in tropical seas, and living in a group. They are found on reefs in the Indo-Pacific region, including the Red Sea.
Pesce Sergente Scissortail sergeant Abudefduf sexfasciatus intotheblue.it
Distribution and habitat
Scissortail sergeants are found in the Indo-Pacific including the Red Sea. Areas scissortail sergeants can be found in around the Indian Ocean include the Red Sea, eastern Africa, Madagascar, Seychelles, the Persian Gulf, India, Sri Lanka, the Bay of Bengal, the Andaman Sea, Indonesia, and Australia.
Pacific Ocean populations are found in the Great Barrier Reef around Australia, the Gulf of Thailand, Indonesia, the Philippines, Taiwan, Japan, and various Pacific islands all the way to Hawaii. Adults live in coral reefs while younger individuals live in the open sea. They are found at depths of 1 to 20 metres (3.3 to 65.6 ft).
Description
This fish is white. They have 5 vertical bands that are black. Two horizontal bands are also sometimes present on the lobes of their tail. This fish can grow up to 22 centimetres (8.7 in) at maximum length.
Diet
This species fish feeds on algae, zooplankton, and sometimes its own eggs. Behavior This fish aggregates in large groups above coral.
https://en.wikipedia.org/wiki/Scissortail_sergeant