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Goldspot Goby

Gnatholepis thompsoni

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Original side-profile illustration of Goldspot Goby (Gnatholepis thompsoni); the small golden spot above the pectoral base is the signature mark.
Original identification illustration of Goldspot Goby. Features may vary.

Fun facts for your next surface interval

  • Its gold spot is a tiny shoulder badge just above the pectoral fin.
  • Unlike many gobies with naked cheeks, it has scales on the cheek and gill cover.
  • The name survived a modern taxonomic review that distinguished it from similar Indo-Pacific relatives.

Florida and local context

Lake Worth Lagoon, Palm Beach County, Florida: The exact species row in the Florida Museum Lake Worth Lagoon checklist is marked verified, rather than merely listed as potentially occurring.

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 small golden spot above the pectoral base is the signature mark. A partial dark ring surrounds it, while a narrow dark stripe crosses the head through the eye and continues down the cheek. The head is thick and blunt, with a mouth slightly beneath the snout. Two separate dorsal fins and a pelvic disc complete the goby outline.

Size and life stages

The Smithsonian account gives a maximum length of about 8.2 cm (3.2 inches). Its reported depth envelope is about 0.5–85 m. 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

Open sand near reef bases and rocky rubble is the characteristic habitat. The pale body is suited to this exposed bottom setting, and the fish can disappear visually against a sand-and-shell mixture. Search reef margins rather than only holes in solid coral. Its habitat record includes reef-associated soft bottom, not simply the coral structure itself.

Range and local context

The documented regional range is Across the Atlantic; western records extend from Bermuda to Brazil. The exact species row in the Florida Museum Lake Worth Lagoon checklist is marked verified, rather than merely listed as potentially occurring. These records establish geographic occurrence, not abundance or a guaranteed encounter at a particular dive site.

What is on the menu?

The recorded menu combines benthic microalgae, detritus and small crustaceans. Food is obtained in the bottom environment rather than exclusively from passing plankton. Large rough scales cover not only the body but also the cheek and gill cover. When watching the fish forage, note where it takes bites without stirring the sand to expose food.

Daily habits and behavior

The species occupies open sand beside sheltering reef or rubble. Its light color, small head marks and low position can make it difficult to notice until it moves. The golden shoulder mark is a better close-range clue than a general impression of spots. Avoid calling a single observed individual territorial or paired unless its behavior actually supports that description.

Mating and the next generation

The Smithsonian record identifies benthic eggs and pelagic larvae. The eggs and the later bottom-dwelling adult are associated with substrate, while the larval stage provides a different water-column phase. The sources checked do not establish a local nesting season, an incubation length or a typical brood size. These details are not borrowed from unrelated aquarium gobies.

Look-alikes and identification traps

Bridled and colon gobies also occupy pale reef-edge bottom. Goldspot has the conspicuous yellow shoulder ocellus and the narrow bar running across the head through the eye. Bridled gobies instead show a dark double-peaked mark over the gill cover. Check those head and shoulder features together; a tiny yellow reflection alone is not a reliable identification.

Observe without disturbing

Keep fins and camera equipment off the sand while photographing the shoulder mark. Approach slowly from the side rather than driving the fish into the reef. Do not dig, net or scoop sand to expose it. A useful record includes the head, pectoral base and whole flank, plus the actual depth and substrate observed.

Harvest, protection and eating safety

Restricted marine life: live collection only; no spearing

Can it be hunted or harvested?

Goldspot Goby (Gnatholepis thompsoni) 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

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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