Black Margate

Fascinating facts about the Black Margate

• When German naturalist Marcus Elieser Bloch described this fish in 1791, he placed it in a different genus, Lutjanus, showing how scientific names can shift as we learn more about relationships. The type specimen came from Suriname, anchoring its identity to South America’s coast. This taxonomic twist reminds us that even long-standing names are snapshots of evolving knowledge.
• A typical adult measures about 45 cm (18 in) long, yet the species can stretch to a maximum of 76 cm (30 in) and weigh up to 5.8 kg (13 lb).
• At night these fish leave their daytime hideouts in caves, ledges, and wrecks to hunt sea urchins, especially those of the genus Diadema, along with crustaceans, molluscs, and smaller fish.
• Spawning gatherings have been recorded off Jamaica between April and August.
• Larger individuals have been linked to ciguatera poisoning, which limits its desirability for consumption.

At a glance

About the Black Margate

The black margate (Anisotremus surinamensis) is a striking marine grunt with a deep, compressed silhouette and a high back that hints at its powerful swimming style. Adults typically reach about 45 cm, though some grow to 76 cm and weigh up to 5.8 kg. Their grey-silver bodies are darker toward the head, and each dorsal scale bears a black center, giving the fish a subtle speckled sheen. Dark grey fins contrast with the darkest pelvic and anal fins, while a darker patch crowns the rear of the pectoral fins. Juveniles are unmistakable, flaunting a bold black stripe along the lateral line and another along the upper back, plus a conspicuous black spot at the base of the tail fin, a pattern that fades as they mature. In the warm western Atlantic, black margates favor steep, sloping rock substrates and reef ledges from Florida’s Cape Canaveral down to Brazil’s Rio de Janeiro, even inhabiting the remote Fernando de Noronha and Trindade islands. By day they hide in caves, ledges, and wrecks, emerging at night to hunt crustaceans, molluscs, smaller fish, and especially sea urchins of the genus Diadema. Their nocturnal forays often gather them in small groups or solitary patrols, and during the Jamaican spawning season from April to August, adults assemble in temporary aggregations, releasing larvae that later settle on rocky seabeds off Florida, a life cycle that underscores the species’ tight link to reef habitats and the surprising reliance on a single urchin genus for sustenance.

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