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Mycteroperca bonaci, the black grouper, black rockfish or marbled rockfish, is a species of marine ray-finned fish, a grouper from the subfamily Epinephelinae which is part of the family Serranidae, which also includes the anthias and sea basses. This species is found in the western Atlantic Ocean from the northeastern United States to Brazil.
Black Grouper has an oblong, leterally compressed body with a standard length which is 3.3 to 3.5 times its depth. It has an evenly rounded preopercle with no incisions or lobes at its angle. The dorsal fin contains 11 spines and 15-17 soft rays while the anal fin has 3 spines and 11-13 soft rays, both fins having rounded margins. The caudal fin is truncate to emarginate, althoughit may be convex if spread widely. This species has an overall t’s an olive grey colour and is marked with dark blotches and brassy hexagonal spots over the head and flanks. The pectoral fins are sooty brown, fading to orange towards the margin; the soft rayed part of the dorsal fin and the anal fin, as well as the forward edge of the pelvic fin have a dark margin. This fish attains a maximum total length of 150 centimetres (59 in), although they are more common at around 70 centimetres (28 in) and a maximum published weight of 100 kilograms (220 lb).
Black Grouper occurs over rocky bottoms and coral reefs at depths of 10 to 30 metres (33 to 98 ft), however in the eastern Gulf of Mexico it is normally encountered at depths of more than 30 metres (98 ft). It is usually a solitary species, the adults feeding mainly on fishes, such as grunts, snapper and herrings, and the juveniles feed on crustaceans. Black groupers have been recorded forming seasonal feeding aggregations along the outer continental shelf off Brazil, these coincide with spawning aggregations of some fish species the groupers prey on. They are is a monandric protogynous hermaphrodites and they form spawning aggregations and these have been reported from in the Gulf of Mexico and Caribbean Sea. Females attain sexual maturity at around 5years old and at a length of around 82.6 centimetres (32.5 in) and the chenge of sex to males occurs when they are around 15 years old and at a mean length of 121.4 centimetres (47.8 in).
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