Nurse shark
A bottom-dwelling shark found in tropical coastal waters of the Atlantic and Pacific.
The nurse shark lives in shallow reefs and mangroves across the Americas, Africa, and the Eastern Pacific. It is a sedentary predator that feeds on crustaceans and small fish, and its robust nature makes it valuable for scientific study.
- Maximum recorded length is 3.08 metres.
- Newborns measure approximately 30 centimetres.
- Females give birth to 21–29 live pups.
- Uses powerful suction to capture prey.
- Global conservation status is vulnerable.
What it is
This elasmobranch features a broad head, two rounded dorsal fins, and an elongated tail. Adults display a brownish hue, while juveniles are born with spots that fade as they mature. The species reaches a maximum documented length of roughly three metres. Its name likely stems from historical spelling shifts or observations of live birth. Unlike many active hunters, this shark remains largely stationary during daylight hours.
Where it lives
Populations exist in tropical and subtropical zones across three major ocean basins. In the Eastern Atlantic, ranges stretch from Cape Verde to Gabon. The Western Atlantic population extends from Rhode Island down to southern Brazil, including the Caribbean. Eastern Pacific individuals inhabit waters from Baja California to Peru. These sharks prefer inshore environments over open seas.
How it lives
They act as opportunistic predators, consuming small fish, crustaceans, molluscs, and algae. By night, they sift through seabed sediments for food using powerful suction forces. During the day, they often gather in groups near crevices or ledges for shelter. Despite their solitary feeding habits, they show strong loyalty to specific locations. Predators such as alligators and crocodiles may occasionally attack them in shared coastal habitats.
Breeding and life cycle
Females produce eggs that hatch internally before giving birth to live young. Mating occurs between late June and July, followed by a six-month gestation period. Females reproduce every two years, taking up to eighteen months to prepare a new batch of eggs. Litters typically contain between twenty-one and twenty-nine pups. Multiple fathers can fertilize a single brood, increasing genetic diversity among offspring.
Fish and people
Fisheries target this species directly in some regions, while others encounter it as by-catch. Their calm temperament and ability to withstand handling make them ideal subjects for tagging and research programs. Conservation assessments vary by location, with global status listed as vulnerable. Some national jurisdictions consider them least concern due to stable local populations, though threats persist in Central America and the Caribbean.
Status and threats
The International Union for Conservation of Nature lists the species as vulnerable worldwide. Regional statuses differ, with the United States and Bahamas classifying them as least concern. However, the western Atlantic faces near-threatened classification due to pressures in South America and the Caribbean. Overfishing and habitat degradation contribute to these concerns. Protection measures remain uneven across their extensive range.
Questions people ask about Nurse shark
What does the nurse shark eat?
They feed on small fish, crustaceans, molluscs, sea urchins, tunicates, anthozoans, and algae. They use suction to pull food from the seabed at night.
How big do nurse sharks get?
Adults reach a maximum documented length of 3.08 metres. Past reports of larger sizes are considered exaggerated. Newborns start at about 30 centimetres long.
Where do nurse sharks live?
They inhabit tropical and subtropical coastal waters in the Eastern Atlantic, Western Atlantic, and Eastern Pacific. They prefer shallow reefs, seagrass flats, and mangrove islands.
Are nurse sharks dangerous to humans?
They are generally sedentary and non-aggressive. Their robust nature makes them suitable for research and handling. They are not considered highly dangerous to humans.
How do nurse sharks reproduce?
They are ovoviviparous, meaning eggs hatch inside the female. Mating occurs in summer, with a six-month gestation resulting in litters of 21–29 pups.
Good reading and sources
The facts on this page come from the Wikipedia article "Nurse shark", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
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