Fish identification archive / Blue Hamlet

Blue Hamlet

Hypoplectrus gemma

Fun facts for your next surface interval

The tail’s dark upper and lower borders contrast with its clear center. [source]
Its diet includes both little fishes and crustaceans. [source]
Eggs and larvae are listed as pelagic, unlike the bottom eggs of many reef damselfishes. [source]

Florida and local context

REEF's cumulative citizen-science diver survey report lists Hypoplectrus gemma at Carysfort Reef Ball 1. 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: Carysfort Reef Ball 1

How to recognize this animal

Look for a bright-blue head and body with a mostly clear tail bordered in black above and below. The body is deep and flattened from side to side, with a continuous dorsal fin.

Sources: Smithsonian Tropical Research Institute: Blue Hamlet

Size and life stages

The regional reference gives 13 cm (5.1 inches) as the maximum. Treat this as a published size record, not a typical length for every local sighting.

Sources: Smithsonian Tropical Research Institute: Blue Hamlet

Habitat and where to look

A reef-associated fish. Observe the edges of coral and rock structure without inserting lights or equipment into occupied shelter.

Sources: Smithsonian Tropical Research Institute: Blue Hamlet

Range and local context

The Smithsonian places this species in the northern Greater Caribbean. Only the supplied named-site survey records are used to document its presence within the Florida corridor.

Sources: Smithsonian Tropical Research Institute: Blue Hamlet

What is on the menu?

A carnivore whose compiled diet includes small bony fishes and mobile bottom-dwelling crustaceans such as shrimps and crabs. A nearby shrimp is not necessarily a captured meal; document the actual interaction before describing predation.

Sources: Smithsonian: species ecological data report

Daily habits and behavior

The source categorizes it as bottom-associated on reefs. Follow its movements visually rather than herding it into an open patch. Detailed local territory sizes and activity schedules were not verified.

Sources: Smithsonian: species ecological data report

Mating and the next generation

The compiled account lists pelagic eggs and larvae. No Florida spawning dates are established here. A pair of fish in one image is not proof that spawning occurred.

Sources: Smithsonian: species ecological data report

Look-alikes and identification traps

Indigo hamlets, Maya hamlets and blue chromis appear in the reference’s comparison list. Check the blue body together with the clear, black-bordered tail and overall hamlet shape; blue alone is unreliable.

Sources: Smithsonian Tropical Research Institute: Blue Hamlet

Observe without disturbing

Allow room around shelter and avoid repeatedly approaching a fish that retreats. Photograph its whole side and tail without baiting. An uncertain identification is preferable to chasing for a closer view.

Sources: Smithsonian Tropical Research Institute: Blue Hamlet

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?

Hypoplectrus gemma falls within the hamlet/seabass group; Hypoplectrus gemma is not an excluded Centropristis seabass or regulated grouper. 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.

Make your next dive happen

Review current dates, availability, prices, inclusions and requirements on each listing before booking or buying.

Call us now

(772) 600-8288

Ask about marine life identification

Marine Life Identification

Ask about dates, prerequisites or your next step. An inquiry does not reserve a place. Please provide your own contact details; do not include medical, payment or a child's personal information.

We use these details to respond to your inquiry. This form does not sign you up for marketing.