Gomphosus caeruleus, the green birdmouth wrasse, is a species of wrasse belonging to the family Labridae, Actinopterygii class, Perciformes order. It can be found in the aquarium trade. This tropical species of wrasse is native to the Indian Ocean, Red Sea, East and South Africa. It occurs on rocky reefs and coral, especially in coral-rich areas of lagoon and seaward reefs. It occurs between depths of 1–35 metres. funny and particular fish
Gomphosus caeruleus can reach a length of about 32 centimetres. This is a dark specie of wrasse which has an extended ‘beak-like’ snout. The male has a light blue edge running along his pectoral fin and lime green dorsal and anal fins. The females have the lower head and breast pale with a marked dark stripe through eye they also have a yellow anal and caudal fins. Juveniles are pale with a dusky streak from their snout through the eye and onto the body. It can be told apart from the similar birdnose wrasse Gomphosus varius ( Birdnose Wrasse) by it distribution and by the formers bright green stripe along the flanks of the males, no yellow in the tail of females or of a green back in the juveniles. There are 8 spines in the dorsal fin which has 13 soft rays while the anal fin 3 spines and 11 rays. Gomphosus caeruleus feeds on small invertebrates.
Very little is known about the reproductive habits of this species. The wrasse are a family Labridae, of marine fish, many of which are brightly colored. The family is large and diverse, with over 600 species in 81 genera, which are divided into 9 subgroups or tribes. They are typically small fish, most of them less than 20 cm. long, although the largest, the humphead wraasse, can measure up to 2.5 m.
Most labrids are protogynous hermaphrodites within a haremic mating system. A good example of this reproductive behavior is seen in the California sheep head. Hermaphroditism allows for complex mating systems. Labroids exhibit three different mating systems: polygynous, lek-like, and promiscuous. Group spawning and pair spawning occur within mating systems. The type of spawning that occurs depends on male body size. Labroids typically exhibit broadcast spawning, releasing high numbers of planktonic eggs, which are broadcast by tidal currents; adult labroids have no interaction with offspring. Wrasses of a particular subgroup of the family Labridae, Labrini, do not exhibit broadcast spawning.
Sex change in wrasses is generally female-to-male, but experimental conditions have allowed for male-to-female sex change. Placing two male Labroides dimidiatus wrasses in the same tank results in the smaller of the two becoming female again. funny and particular fish
(extract from Wilipedia)