Fish identification archive / Cottonwick
Cottonwick
Haemulon melanurum
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Fun facts for your next surface interval
- The dark back stripe continues into a black V in the tail.
- A juvenile cottonwick lacks the separate round tail spot found in several other young grunts.
- Cottonwicks use both offshore reefs and nearby grass beds rather than one narrowly defined habitat.
Florida and local context
Lake Worth Lagoon / Blue Heron Bridge area, Palm Beach County: Florida Museum explicitly marks this species verified in Lake Worth Lagoon. This documents occurrence, not current abundance or a guaranteed dive encounter.
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
A cottonwick's defining mark is the dark stripe running along the upper back and into the tail. It broadens toward the rear, crosses the upper tail base, and joins a black V in the forked caudal fin. The body beneath it is silvery with bronze lines. Most remaining fins are pale rather than vivid yellow.
Size and life stages
The species reaches about 14 inches, or 35 centimeters. Juveniles have several black longitudinal stripes, including a thin middle stripe that bends down to meet the lower stripe near the tail base. There is no separate round tail-base spot. That absence is useful when sorting juvenile cottonwicks from other small striped grunts in a photograph.
Habitat and where to look
Cottonwicks use clear inshore and offshore reefs and adjacent grass beds. Hard bottom provides daytime structure, while nearby softer habitat broadens the area available to the fish. Smithsonian records a wide depth range, approximately 1 to 140 meters. Those records describe the species as a whole, not a depth a diver needs to reach to identify one.
Range and local context
Bermuda, Florida and the Caribbean lie within the western Atlantic range, which extends to Brazil. Florida Museum marks cottonwick as verified in Lake Worth Lagoon. That provides a documented Palm Beach County occurrence under Haemulon melanurum. It does not establish present abundance, a particular seasonal pattern, or guaranteed sightings during a Blue Heron Bridge visit.
What is on the menu?
Crustaceans are a recorded food, with broader species data also including mollusks and echinoderms. The fish is an animal-feeding grunt, not a grazer despite the frequent connection with grass beds. Watching a fish search the reef margin can reveal more about its activity than a still portrait of a group resting in open view.
Daily habits and behavior
Schools occur around both inshore and offshore reefs. In a mixed grunt gathering, follow the broad back stripe into the tail rather than treating the school as a single identification. Juvenile and adult patterns differ enough that fish of different sizes can look unrelated at first. Repeated photographs of the same group can help separate age from species differences.
Mating and the next generation
Cottonwicks lay eggs, and pairing during breeding is reported in FishBase. Smithsonian lists pelagic eggs and larvae. Early development therefore includes a drifting water-column stage even though adult divers usually encounter the species near reef structure. The reviewed references do not supply a specific Palm Beach spawning schedule, and school formation should not be equated with reproduction.
Look-alikes and identification traps
Bluestriped grunts have blue lines over a yellow body and dark fins, whereas cottonwicks have a silver body with a single broad dark upper-back feature. Caesar grunts can also be dark-backed; use the cottonwick's continuous connection between the back stripe and tail V. Young fish require stripe-junction and tail-spot checks rather than adult color alone.
Observe without disturbing
For identification, allow a fish to turn naturally so the upper back and full tail become visible. Do not separate it from its school or block the group's route over the reef. Include grass or reef habitat in a second wider photograph if possible, while keeping the main side view clear enough to show the stripe connection.
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. SAFMC lists cottonwick as an ecosystem-component species without federal management measures; state and site restrictions still matter.
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
- FWC default recreational bag and legal gear
- FWC recreational marine-life rules
- Florida marine-life rule text mirror; checked against official index
- FWC Biscayne National Park exceptions
- SAFMC cottonwick ecosystem-component status
- FWC spearing species and location restrictions
- Florida DOH current fish-consumption advisory portal
- Florida DOH seafood-poisoning guidance
- FDA advice about eating fish
- FWC saltwater recreational licensing
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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