Fish identification archive / Black Durgon

Black Durgon

Melichthys niger

Fun facts for your next surface interval

A small second dorsal spine helps lock the first spine upright. [source]
The pale fin-base lines can remain useful when the body looks almost entirely black. [source]
Its compiled diet includes drifting plankton as well as bottom-associated foods. [source]

Florida and local context

REEF's cumulative citizen-science diver survey report lists Melichthys niger at Breakers Reef. This is a historical reported occurrence, not an independently reidentified voucher or an encounter guarantee. Other supplied named-site reports are preserved in the observations list. Reports cover 1/1/93–11/10/26; historical occurrence does not establish present abundance or guarantee a sighting.

A documented past record does not establish present abundance or guarantee an encounter.

Sources: REEF cumulative diver-survey report: Breakers Reef

How to recognize this animal

A dark blue-black triggerfish with narrow pale blue-white lines along the bases of the soft dorsal and anal fins. The head may look yellowish, and fine blue lines radiate from the eye.

Sources: Smithsonian Tropical Research Institute: Black Durgon

Size and life stages

The Smithsonian reports a maximum of 50 cm (19.7 inches). A dark silhouette without scale or fin detail is not enough to determine size or species.

Sources: Smithsonian Tropical Research Institute: Black Durgon

Habitat and where to look

Uses rocky reefs and coral areas. Look both near the reef and in the water above it, while retaining a safe view of the dive team and surroundings.

Sources: Smithsonian Tropical Research Institute: Black Durgon

Range and local context

A circumtropical species; the western Atlantic account extends from Bermuda to Brazil. Local corridor occurrence remains tied to the supplied individual survey sites.

Sources: Smithsonian Tropical Research Institute: Black Durgon

What is on the menu?

The compiled diet spans plankton, algae and animal material including sponges and fishes. This breadth does not mean every individual eats all those items at one site. Record the prey or surface actually contacted.

Sources: Smithsonian: species ecological data report

Daily habits and behavior

The source places this fish in the water column as well as near the bottom. Watch its route from a stationary position rather than swimming into its path to create a closer encounter.

Sources: Smithsonian: species ecological data report

Mating and the next generation

The ecological report lists bottom-associated eggs followed by pelagic larvae. It does not supply a verified spawning calendar for the named Florida survey sites. Keep observations separate from unverified reproductive interpretations.

Sources: Smithsonian: species ecological data report

Look-alikes and identification traps

Compare other dark triggerfishes using the pale lines at both soft-fin bases, not darkness alone. The reference also lists ocean triggerfish and rough triggerfish as comparison candidates; fin position and full side views matter.

Sources: Smithsonian Tropical Research Institute: Black Durgon

Observe without disturbing

Keep clear of the mouth and do not handle or corner the fish. If it repeatedly approaches or changes direction toward you, increase your distance instead of testing its response. Never offer food.

Sources: Smithsonian Tropical Research Institute: Black Durgon

Harvest, protection and eating safety

Live-only ornamental collection; closed sites apply

Yellow denotes conditional live ornamental collection, never food harvest. Closed collection sites override statewide bag allowances. No year-round open season is inferred from the absence of dates.

This color is a qualified summary, not permission to collect or a guarantee that a particular animal is safe to eat.

Can it be hunted or harvested?

Melichthys niger falls within the triggerfish group; Melichthys niger is neither excluded gray triggerfish nor ocean triggerfish. Florida recreational marine-life rules require live landing and continued live maintenance with suitable circulation, aeration or oxygenation. Where collection is lawful, the normal limit is five of a species within 20 total marine-life organisms per person daily; two-day possession is ten of a species within 40 total. A recreational saltwater license is required unless exempt; recreational sale is prohibited. No additional species-specific size restriction is stated for this taxon in the reviewed FWC table.

Florida seasons and areas

Florida marine-life requirements also apply in adjacent federal waters. Listed marine-life collection is prohibited in the mapped Blue Heron Bridge Special Marine Life Area, not throughout Palm Beach County. Pennekamp prohibits tropical-fish collection. Biscayne National Park prohibits ornamental collection except under a valid superintendent-issued collecting permit. This is not permission to seek or use such a permit. Check the exact site, not just the county. Florida Keys Sanctuary Preservation Areas prohibit fishing and collection, subject to specifically stated exceptions; the Key Largo Management Area separately prohibits tropical-fish take and spearfishing. Biscayne National Park has additional rules, including a mapped March 1–May 31 fishing closure effective in 2026. These are not whole-county bans.

Can it be speared?

Do not spear this live-only marine-life species. Use only authorized nonlethal collection methods where collection is permitted. Location restrictions still apply: spearfishing is prohibited in Monroe state waters from Long Key, including Long Key, north to the Miami-Dade line. This state-water restriction is separate from the Key Largo Management Area prohibition. Florida also restricts spearfishing around swimming beaches, fishing piers/bridges, jetties and state parks; federal water alone is not permission to spear in a closed sanctuary zone.

Is it safe to eat?

Not a recreational food-harvest fish under these live-only rules. No recipe, preparation method or food-safety clearance is provided. A harvest allowance is not a food-safety clearance. Check current Florida Department of Health advice for the capture location, species and person eating the fish. This review establishes no meal frequency and no local restaurant menu match.

This review covers the Vero Beach–Key Largo Atlantic corridor: Indian River, St. Lucie, Martin, Palm Beach, Broward, Miami-Dade and Monroe counties. Florida Atlantic state waters and South Atlantic federal waters are distinct jurisdictions. Do not extend a state-water season tag to federal waters or transfer Atlantic rules to Gulf-side Keys waters. Park and sanctuary boundaries can override a species allowance.

Before you act: Confirm the species, date, exact management area, state or federal waters, gear, licenses and current local closures. A local occurrence record never grants permission to take an animal.

Official rules and health guidance

Reviewed 2026-11-11. Rules and advisories can change; check the linked authorities before acting.

Identification and source cautions

Survey records are citizen-science reports, not independently reidentified vouchers; report frequency is not a current encounter probability.
Detailed local reproductive timing and site-specific diet have not been established.

Sources and review

Biology and taxonomy reviewed 2026-11-11. Photographs on cited sites are reference material and are not reproduced here.

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