Scirrortail sergeant [Abudefduf sexfasciatus]

female (male has yellow between stripes)

The Scissortail sergeant or Striptailed damselfish (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, being similar to those of the Sergeant Major damselfish. It grows to a length of about 16 cm (6 in).

Scissortail seargents are coral reef dwelling fish, living at depths of up to 15 m (50 ft) in tropical reaches, often living in a group surrounding a single head of coral. They are found on reefs in the Indo-Pacific area. The fish feed upon the larvae of invertebrates, zooplankton, smaller fishes, crustaceans and various species of algae. They are preyed upon by some members of the Labridae and Serranidae families. They lay their eggs in patches on a firm substrate and guard them vigorously until they hatch. (Text source: Wikipedia)

Picture: Ras Abu Galoum, Dahab, Egypt by Sami Salmenkivi

Blue green chromis [chromis viridis]

The Green Chromis or the Blue Green Chromis or the Bluegreen Puller, Chromis viridis, is a species of damselfish. Individuals tend to be iridescent apple-green and light blue, and reach a length of about 3 in (8 cm).

The species is found in the Indo-Pacific. They live in large aggregations above Acropora corals in sheltered areas such as lagoons and reef flats and feed on phytoplankton. Juveniles live closely tied to individual coral heads. C. viridis spawn over sand and rubble. The male prepares the nest which is shared with several females. The large number of eggs will hatch in 2-3 days. The male guards the nest, ventilating it with its fins and feeding on those eggs that do not hatch.  (text source: Wikipedia)

Picture: Naama Bay, Red Sea, Egypt by Sami Salmenkivi

Yellowtail damselfish [Microspathodon chrysurus]

(juvenile)

Wikipedia has no article on Yellowtail damselfish, Microspathodon chrysurus.

Picture: Roatan, Honduras by Sami Salmenkivi

Sergeant Major [Abudefduf saxatilis]

The Sergeant Major or píntano (Abudefduf saxatilis, family Pomacentridae) is a large, colourful damselfish. It earns its name from its brightly striped sides, which are reminiscent of the insignia of a military Sergeant Major. It grows to a length of about 15cm (6 inches).

The fish feed upon the larvae of invertebrates, zooplankton, smaller fish, crustaceans and various species of algae. They are preyed upon by some members of the Labridae and Serranidae families. They lay their eggs in patches on a firm substrate and guard them vigorously until they hatch.

Sergeant majors are found throughout the tropical reaches of the Atlantic, including off the south coast of the United States, Central America, eastern South America and western Africa. They are often found on coral reefs at depths of between 1 and 12 meters. (text source: wikipedia)

Picture1: Utila, Honduras, picture2: Red Sea, Egypt by Sami Salmenkivi