A large fin suddenly appearing near swimmers is enough to cause panic, especially when it looks like a shark. That is what happened at a Marbella beach, where a huge tuna swimming in shallow water was mistaken for a shark. The Marbella beach tuna scare happened at Ancón Beach along the Spanish resort city’s Golden Mile. One swimmer was seen trying to get away from the animal as people watched from the shore. The fish was later identified as a tuna weighing around 295 kilograms, or about 650 pounds.
Here is what happened, why the fish came so close to shore, and how beachgoers eventually helped it.
A huge fish caused panic
The unusual scene happened at Ancón Beach in Marbella, a popular beach area on Spain’s Costa del Sol. Video showed a large sea animal moving in the shallow water, with its fin visible above the surface.
The size and shape of the animal made it look like a shark to some people nearby. One swimmer appeared to try to reach the shore quickly while people along the beach watched the scene unfold.
The animal was actually a tuna
The animal was later identified as a giant tuna. Reports put its weight at about 295 kilograms, making it an extremely large fish even by tuna standards.
Tuna are powerful swimmers and can travel close to shore. Their large bodies and tall dorsal fins can also make them hard to identify when they are seen only briefly or through moving water.
The tuna was in trouble
The situation became clearer when the tuna began struggling in the shallow water. Reports said the fish was bleeding from its gills, and the water around it appeared red.
The exact cause of the injury was not confirmed. Possible explanations mentioned in reports included contact with fishing gear or a collision with a jet ski, but these remain possibilities rather than proven causes.
Beachgoers tried to help
Once people realized the animal was a tuna and appeared to be in distress, the mood changed. Instead of fearing a shark attack, beachgoers focused on getting the huge fish back into deeper water.
People reportedly used sunbeds and deck chairs to help guide the tuna away from the shallow area. The effort showed how quickly the situation changed from fear to concern for an animal that appeared to need help.
Why it looked like a shark
Tuna can look very different when viewed from above the water. A large dorsal fin moving through waves can easily be mistaken for a shark, especially when a person sees it for only a few seconds.
The confusion was understandable because Marbella has had real shark sightings. In May 2025, a large basking shark was filmed off the Marbella coast. Basking sharks are huge but generally harmless to people because they feed by filtering tiny organisms from the water.
The beach scare ended safely
The Marbella incident did not turn into a shark attack. The animal was identified as a tuna, and the focus shifted to helping it leave the shallow water.
The episode is a reminder that unusual animals can sometimes appear close to busy beaches. It also shows why people should avoid rushing toward large marine animals and instead give them space while trained authorities or experienced rescuers assess the situation.
Featured Image: Photo by Angel Chavez on Unsplash
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