Comb Grouper

Fascinating facts about the Comb Grouper

• A single comb grouper can weigh up to 10.1 kg, though most top out around 4 kg.
• When hunting, these grouper stage a dramatic ‘playing dead’ act: they lie on their side in open water, twitch just enough to lure curious fish, then snap up to five prey in just 15 minutes, proving that deception can be a deadly tool even without any reef cover.
• Their bodies are built for speed and power: an 80 cm adult is only about one-third as deep as its length (depth = 2.7–3.2 × standard length), giving a sleek, laterally-compressed shape that lets them dart through reef currents with minimal drag.
• Juvenile comb groupers grow up in a surprising mix of habitats, soft coral gardens, turtle-grass beds, mangroves, and even tide-pools on South Brazil’s rocky shores, a flexibility that likely helps them survive the variable conditions of their early life.
• Spawning in Brazilian waters lines up with the southern spring, from September to December, and the fish release their eggs into the open water without guarding them, a strategy that relies on sheer numbers rather than parental care to keep the next generation afloat.

At a glance

About the Comb Grouper

The comb grouper, Mycteroperca acutirostris, wears a muted palette of grey-brown skin splashed with irregular white spots, while three to four dark brown, undulating lines trace the underside from behind the eye. Its body is laterally compressed, reaching up to 80 cm and typically weighing around 4 kg, though specimens as heavy as 10 kg have been recorded. The dorsal fin bears 11 spines and 15-17 soft rays, the anal fin 3 spines and 10-12 soft rays, both edged with darker hues punctuated by white speckles. A distinctive dark stripe runs from the maxillary streak to the preopercle margin, and the fish’s head features a convex interorbital area and an angular preopercle with enlarged serrations. In the warm western Atlantic, from Bermuda and the north-western Gulf of Mexico down to Brazil, the comb grouper inhabits reef ecosystems. Adults favor rocky substrates, while juveniles seek refuge among soft corals, turtle-grass beds, mangroves, and even intertidal tide pools of southern Brazil. Their hunting repertoire includes a striking death-feign tactic: the grouper lies on its side in open water, barely moving, to lure unsuspecting prey before lunging with a rapid suction-feed. At dawn and dusk they pursue sardine schools, and juveniles can mimic the black-ear wrasse to approach prey, sometimes following gold-spotted eels to snatch disturbed decapods. A single juvenile off south-eastern Brazil captured five fish in just fifteen minutes, showcasing the species’ opportunistic and clever predation.

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