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Black Margate

Anisotremus surinamensis

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Original adult black margate illustration in side profile. Deep gray body, broad dark forward-body band, dark fins and fleshy lips.
Original identification illustration of Black Margate. Features may vary.

Fun facts for your next surface interval

  • Long-spined Diadema urchins are among its recorded meals.
  • Its name hides a family connection: the black margate is a grunt.
  • A striped juvenile with a tail spot grows into a heavy-bodied adult with a broad dark band.

Florida and local context

Florida regional range; potential Lake Worth Lagoon occurrence: Florida occurrence is documented by the linked species references. The Lake Worth Lagoon checklist includes this species but leaves the Verified cell blank; its lagoon occurrence is treated here as potential, not confirmed.

Documented regional presence is not a guarantee of an encounter or a measure of how common this animal is at your dive site.

How to recognize this animal

The black margate has a high-backed, deep body, a short blunt head and a small, low-set mouth with fleshy lips. A broad dark band crosses the forward body and belly against a paler gray background. The fins are dark. Its deeply notched continuous dorsal and powerful overall profile distinguish it from slender, horizontally striped grunts.

Size and life stages

A large black margate can reach around 30 inches, or 76 centimeters. Juveniles look different: they have dark longitudinal stripes and a prominent tail-base spot, with the broad body band less distinct. The adult illustration should therefore not be used as a complete juvenile key. Body proportions, tail mark and stripe arrangement all deserve attention in young fish.

Habitat and where to look

Larger patch reefs, steep rocky bottoms, ledges, caves and wrecks provide habitat. FishBase particularly notes association with sheltered structure. Smithsonian records extend from shallow water to more than 100 meters. A fish holding under a ledge may offer only a partial view, making a patient observation more useful than trying to push it into the open.

Range and local context

Florida is within the documented western Atlantic range, which extends south through the Caribbean to Brazil. The Florida Museum Lake Worth Lagoon checklist lists black margate without verification. Its inclusion here reflects established Florida distribution and suitable reef habitat, while its lagoon occurrence remains a potential record. Neither habitat suitability nor a checklist entry guarantees a Palm Beach sighting.

What is on the menu?

Black margates feed at night on crustaceans, mollusks, smaller fishes and long-spined Diadema urchins. The strong lips and small mouth should not be mistaken for a harmless plant-grazing apparatus. The combination of hard-shelled invertebrates and fish makes this a varied animal diet. A sheltered daytime fish may simply be resting between periods of feeding.

Daily habits and behavior

The association with caves and ledges can make this species less conspicuous than open-water schooling grunts. At a wreck, inspect accessible exterior shelter without entering an overhead space solely to follow a fish. Its dark band and fins may merge into the background, so watch for the pale gray rear body as it turns near the shelter mouth.

Mating and the next generation

Distinct pairing during breeding is reported for the species. Smithsonian lists pelagic eggs and larvae, linking bottom-associated adults with a drifting early stage. The reviewed sources do not establish a Palm Beach spawning season. Seeing two fish sharing a ledge is not enough to distinguish breeding behavior from normal use of the same protective structure.

Look-alikes and identification traps

The similarly named margate is much more uniformly pale and has a white iris. Spanish grunts show bold horizontal stripes, not the black margate's broad vertical body band. Porkfish have a yellow background and two sharp black bars. These comparisons are best made in a side view that includes both the head and the complete front half of the body.

Observe without disturbing

Never reach into a cave or block a ledge entrance to obtain a portrait. Wait outside the shelter and let the fish choose its position. Record whether the distinctive band was actually visible rather than identifying every large dark grunt as a black margate. Keep fins and equipment clear of the ledge's attached animals.

Harvest, protection and eating safety

Harvest may be allowed; limits and site restrictions apply

Can it be hunted or harvested?

In Florida state waters this species is subject to the default recreational limit of two fish or 100 pounds per person per day, whichever is greater, unless a special area rule applies. No statewide species-specific minimum size is listed in the reviewed rules. Use lawful gear and hold the required saltwater fishing license unless exempt. “Unregulated” does not mean unrestricted or permission to harvest at a dive site. In Biscayne National Park, all grunts count toward the 10-fish per-person aggregate for listed species; other species-specific limits still apply. Transit through the park above that aggregate is prohibited.

Florida seasons and areas

No species-specific annual Florida state-water closed months were identified in the reviewed rules. That is not an all-waters opening: park, sanctuary, refuge and other site closures can apply, and federal rules must be checked for the coast and trip. Verify the actual fishing location and current notices before taking fish.

Can it be speared?

Potentially yes where otherwise lawful: this species is not on FWC’s no-spearing list. Size, bag, area and gear rules still apply. Spearfishing is prohibited within 100 yards of a public swimming beach, a commercial or public fishing pier, or a bridge portion where public fishing is allowed, and in additional listed areas. No powerheads, bangsticks or rebreathers. This is not permission to spear at Blue Heron Bridge or another dive site.

Is it safe to eat?

No unconditional safe-to-eat claim can be made. Check Florida DOH guidance for the exact fish and catch area, including mercury advice for children and people who are pregnant or may become pregnant. Legal harvest does not establish food safety, and cooking is not a reliable way to eliminate all naturally occurring marine toxins. Do not transfer a consumption table for white grunt to this different grunt species.

Before you act: This recreational overview is not permission to collect or spear at your dive site. Confirm the species, date, management area, state or federal waters, gear, licenses and current local closures. Identification artwork cannot establish an identification or guarantee seafood safety.

Official rules and health guidance

Reviewed 2026-11-10. Rules and advisories can change; check the linked authorities before harvesting or eating.

Sources and review

Reviewed 2026-11-10.

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