About Symphodus caeruleus (Azevedo, 1999)
Symphodus caeruleus is a species of wrasse that grows larger than any of its sympatric close relatives found in the Azores, and it has distinct meristic counts. This species has 17 to 18 spines and 8 to 9 rays in its dorsal fin, and 5 to 6 spines and 7 to 9 rays in its anal fin. It has 33 to 34 scales along its lateral line. Females are overall brownish in colour, fading to a lighter shade towards the ventral side of the body, and have a chequered pattern of dark brown spotting across their body. There are four elongated spots on the body, plus a fifth spot on the caudal peduncle that extends onto the proximal portion of the caudal fin. This spot pattern is also mirrored in the dorsal and anal fins. Terminal phase males are dark greenish-blue, becoming even bluer during the breeding season. They have paler fins and a pattern of darker spots similar to the pattern seen in females. Males can reach a standard length of 21.5 centimetres (8.5 in), while females grow to a maximum standard length of 17.5 centimetres (6.9 in). Symphodus caeruleus is endemic to the Azores, where it occurs in the eastern Atlantic Ocean. This species inhabits shallow, inshore rocky reefs that have a good covering of algae; the fish uses this algae for cover, feeding, and nesting. Like many other wrasse species, Symphodus caeruleus is a protogynous hermaphrodite. Males reach sexual maturity at a total length of 12 centimetres (4.7 in), while females reach sexual maturity at a total length of 14 centimetres (5.5 in). This species' sex change means that males may still resemble the initial (female) phase, or develop into the terminal male phase after changing sex from a female. Spawning takes place from March to June. Larger terminal phase males form harems and become territorial, which attracts females to spawn their demersal eggs in the male's nest. Males then provide exclusive care for the eggs. Males that still resemble the initial female phase have larger testes than terminal phase males, and may attempt to sneakily fertilise eggs during spawning.
