Fish identification archive / Masked Goby
Masked Goby
Coryphopterus personatus
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Fun facts for your next surface interval
- The transparent body can make a school resemble a cloud of floating eyes.
- A white lower eye helps separate it from the very similar glass goby.
- Published reproductive research describes females changing sex to become males.
Florida and local context
South Florida and Florida Keys: The checked specialist species account explicitly includes South Florida and the Florida Keys.
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 body is translucent and the snout and eye region form a dark mask. The lower part of the eye appears white, and a short white horizontal mark at the pectoral base is useful in live identification. Small white internal dashes alternate with orange marks along the body. A male may have an extended second spine in the first dorsal fin.
Size and life stages
The Smithsonian account gives a maximum length of about 4 cm (1.6 inches). Its reported depth envelope is 2–73 m in the Smithsonian record. These are species-level limits, not the expected size and depth of every encounter. Use markings and proportions as well as apparent length; a photograph without a reliable scale cannot establish an exact measurement.
Habitat and where to look
Masked gobies hover near reef structure rather than spending all their time pressed onto sand. Coral heads, columns, shaded reef areas and the nearby water column are useful places to watch. A loose aggregation may look like a cloud of tiny suspended particles until the eyes become visible. Avoid assuming that every transparent goby in the group belongs to one species.
Range and local context
The documented regional range is Florida, Bermuda and the Bahamas through the Caribbean and toward northern South America. The checked specialist species account explicitly includes South Florida and the Florida Keys. The unverified Lake Worth Lagoon row is not treated as proof of a Palm Beach sighting. These records establish geographic occurrence, not abundance or a guaranteed encounter at a particular dive site.
What is on the menu?
Zooplankton is the recorded food. Hovering above the reef places the fish in the water moving past the structure, where minute prey can be intercepted. Unlike the sand-feeding bridled goby, it is categorized as a planktivore. Observe the direction the school faces and any feeding darts, but do not release food to produce a more dramatic photograph.
Daily habits and behavior
This is a schooling, hovering goby associated with reef relief. The group’s presence in open water makes its nearly transparent body especially striking. Conservation assessments describe vulnerability to invasive lionfish and reef changes, but those broad assessments are not a measurement of abundance at a Palm Beach dive. The species should not be called locally abundant without actual survey evidence.
Mating and the next generation
Masked gobies have benthic eggs and pelagic larvae. Research summarized by the specialist account describes protogynous sex change, in which a female can become male, and a social hierarchy associated with reproduction. That is a specific biological feature, not something a diver can establish by body color alone. No Palm Beach spawning dates are inferred here.
Look-alikes and identification traps
Glass goby is an exceptionally close look-alike. A white lower eye and white pectoral-base bar favor masked goby; a black lower eye, no white pectoral bar and stronger scale-edge peppering favor glass goby. Head-pore differences provide a technical distinction that ordinary dive photographs may not resolve. When the marks cannot be seen, label the sighting as masked/glass goby.
Observe without disturbing
Watch the aggregation from outside rather than swimming through it. A brief close photograph can capture the eye and pectoral-base marks without scattering the school. Stay clear of the coral beneath the fish and keep the group’s refuge open. Do not treat the vulnerable conservation category as a substitute for checking the separate Florida harvest rules.
Harvest, protection and eating safety
Restricted marine life: live collection only; no spearing
Can it be hunted or harvested?
Masked Goby (Coryphopterus personatus) is regulated tropical ornamental marine life, not an unrestricted food-fishing species. FWC lists gobies, family Gobiidae. Where collection is lawful, a saltwater fishing license is required unless exempt. Land and keep the fish alive with circulating, aerated or oxygenated life support. Maximum permitted harvest size is 2 inches TOTAL length, not a minimum. Larger individuals must not be collected. Daily limit: five of this species within 20 marine-life organisms total per person. Two-day possession maximum: ten of this species within 40 organisms total. Recreational sale is prohibited.
Florida seasons and areas
No annual recreational closed months are listed for this marine-life species. Collection is prohibited within the designated Blue Heron Bridge dive-site boundary and throughout Biscayne National Park. Collection of these gobies and blennies is also prohibited in John Pennekamp Coral Reef State Park. Florida marine-life rules also apply in adjacent federal waters on both coasts. Check the exact park, refuge or sanctuary zone before collecting. The designated one-square-mile Western Dry Rocks area is closed to all fishing April 1–July 31 annually.
Can it be speared?
No. Spears are not authorized recreational gear for this regulated marine-life fish. Only lawful live-collection methods may be used, such as permitted hand-held, barrier or drop nets or a slurp gun. The live-landing requirement still applies.
Is it safe to eat?
Not recommended as a food target. This fish is regulated for live collection, and this guide does not certify it as safe to eat. Check Florida DOH guidance before consuming locally caught fish. Cooking does not remove all marine toxins. Small size, an absence of a specific advisory, and lawful collection do not establish food safety.
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
- FWC recreational marine-life rules
- FWC Biscayne National Park restrictions
- FWC species-category examples and Pennekamp area restrictions; not recreational quantities
- FWC Western Dry Rocks seasonal closure
- FAC 68B-5.002 text mirror, cross-checked with current official index and FWC
- Official FAC 68B-5.002 current effective-version index
- Florida DOH seafood poisoning and marine toxins
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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