Fish identification archive / Nurse Shark
Nurse Shark
Ginglymostoma cirratum
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Fun facts for your next surface interval
- Baby spots, grown-up plain: small youngsters can be spotted even though adults look unpatterned.
- A favorite nap spot deserves an encore: the same resting shelter may receive repeat visits.
- One litter, a complicated family tree: pups can have different fathers.
Palm Beach connection
Palm Beach reefs: PBC Diving Association explicitly describes nurse sharks resting under reef ledges.
Documented regional presence is not a guarantee of an encounter or a measure of how common this fish is at your dive site.
How to recognize this fish
Start with the head: the nurse shark has small eyes and a pair of nasal barbels beside a mouth positioned well forward. Its two dorsal fins have rounded profiles, and the first sits unusually far back. The tail is long, without the prominent separate lower lobe seen in many familiar shark silhouettes. Adults are generally tan to brown.
Size and life stages
A newborn is only about 27–30 cm long, while adults can approach 3 m. Very young animals may carry dark spots that fade with growth, so an identification based solely on a plain brown adult photograph can miss a juvenile. Length estimates should include the long tail rather than stop at the thick part of the body.
Habitat and where to look
Reefs, rocky shelters, sandy areas and shallow coastal nursery habitats all feature in its life. Young sharks use protected shallows, while larger animals also occupy deeper reef habitat. On Palm Beach reefs, ledges can conceal a resting animal. Look from outside the shelter and allow space for the shark to leave without passing through a group of divers.
Range and local context
This guide covers Ginglymostoma cirratum, the Atlantic nurse shark. It occurs in tropical and subtropical coastal Atlantic waters, including Florida, the Caribbean and the western Atlantic farther south. Eastern Pacific nurse sharks are now treated separately as Ginglymostoma unami. A global range copied from an older field guide can therefore mix two species.
What is on the menu?
Nurse sharks take bottom-associated prey including fish, crustaceans and mollusks. Suction feeding lets them draw food into the mouth rather than relying only on fast pursuit. Their barbels help them investigate the bottom chemically. For a diver, the important distinction is between observing natural searching and supplying food: feeding changes the encounter and should not be encouraged.
Daily habits and behavior
Daytime rest and nighttime foraging are characteristic. Individuals can return to favored resting places, and several sharks may lie close together. Apparent stillness is normal behavior, not an invitation to touch or pose beside the animal. Watch whether your approach changes its position; if it begins moving away, let it depart rather than following under the next ledge.
Mating and the next generation
Females give birth to live pups, commonly in litters of about 20–30. Developing young depend on yolk rather than a placental connection. Reproduction follows a roughly two-year female cycle, with shallow nursery areas important for the young. A litter can have more than one father, a useful reminder that shark family biology is more complex than a simple paired mating story.
Look-alikes and identification traps
Brown color alone is weak evidence, especially in dim water. Combine the barbels, tiny eyes, rounded dorsal fins and elongated tail. A shark whose head is hidden beneath a ledge may not show the most useful traits. Do not reach in or alter its position to expose them; an uncertain identification can be refined later from a respectful photograph.
Observe without disturbing
Give resting sharks room, keep hands away from the head and tail, and never grab or ride them. Do not surround an occupied ledge or seal off a departure route. Keep equipment clear of the bottom and avoid feeding operations. Being accustomed to divers does not make a large wild predator a safe animal to handle.
Harvest, protection and eating safety
Regulated harvest; not a prohibited shark species
Can it be hunted or harvested?
Nurse sharks may be retained under Florida recreational rules: a 54-inch fork-length minimum; one shark per person daily and two per vessel, combined across harvestable sharks. Shore-based shark fishing requires the FWC course and applicable permit.
Florida seasons and areas
FWC lists no annual seasonal closure for this species. Federal HMS rules differ: NOAA lists a 54-inch fork-length minimum and one shark total per vessel per trip for this group, with an HMS permit and shark endorsement. Verify current federal status and local restrictions before fishing.
Can it be speared?
Spearfishing prohibited. Florida shark harvest is hook-and-line only; a legal size does not authorize spearing.
Is it safe to eat?
High-mercury caution. FDA/EPA advises people who are or might become pregnant, breastfeeding people, and children ages 1–11 to avoid shark. Other consumers should check Florida DOH guidance for their catch location; legal harvest is not proof that a meal is safe.
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. A fish illustration cannot establish an identification or guarantee seafood safety.
Official rules and health guidance
- FWC shark recreational regulations
- NOAA recreational Atlantic shark requirements
- FWC spearing restrictions
- FDA/EPA fish-consumption advice
- Florida DOH seafood and local advisories
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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