The nurse shark is one of the most relaxed sharks a diver can meet, a slow, docile bottom-dweller that spends its days resting under ledges. Far from the fearsome image of sharks, it is sluggish by day and completely harmless if left alone. Its broad head, small eyes and whiskery barbels give it a gentle, unmistakable look. Rather than chasing prey, it hunts by suction, vacuuming hidden animals out of the sand and reef at night. In Isla Fuerte, finding one dozing on the sand is a calm, memorable highlight rather than a scary one, and often a diver's very first shark.
How to recognize it
Look under overhangs for a broad, flattened head, small eyes and two short barbels hanging near the mouth like whiskers. Its body is smooth and brownish, and it often lies motionless on the sand.
Unlike most sharks it can rest on the bottom because it can pump water over its gills without swimming, so a still, resting shark here is perfectly normal.
Behavior
Nurse sharks are mostly nocturnal, resting by day and hunting at night for crustaceans, mollusks and small fish, which they suck up with surprising force. Several may pile together in the same shelter to rest.
They are docile and non-aggressive, but they are still wild animals. Never corner, grab or pull the tail of a resting shark and it will simply stay calm.
Where it lives
Nurse sharks live in warm shallow waters of the Atlantic and eastern Pacific, favoring reefs, sandy flats and rocky ledges where they can shelter by day. They tend to stay loyal to a home range.
They are found on the reefs of Isla Fuerte, where divers regularly encounter them resting under ledges, a highlight of shark-focused dives here.
Conservation
The nurse shark is currently of relatively low conservation concern in many areas, but it is still caught for its meat, skin and fins and is sensitive to reef habitat loss. Its calm nature makes it easy to disturb.
Respectful, no-touch diving helps people see sharks as calm neighbors rather than monsters, which is good for every shark species.
A diver's note from Isla Fuerte
The nurse shark is the perfect introduction to sharks: calm, approachable and completely harmless. In Isla Fuerte you can meet one on well-preserved reefs, guided by instructors who will show you how to share the water respectfully. It is the kind of encounter that turns fear into fascination.
Meet the sharks of the Colombian Caribbean through our courses and dives, and find shark-friendly sites on the interactive dive map.
