Shark Bites In French Polynesia Reveal A Hidden Side Of Shark Behavior

Forbes

12-05-2025

Sharks have long been cast as ruthless, mindless predators, a fear so deeply ingrained that it has ... More fueled an entire genre of Hollywood horror films.
Sharks have long been cast as ruthless, mindless predators, a fear so deeply ingrained that it has fueled an entire genre of Hollywood horror films. Yet a long-term study from French Polynesia shows that sometimes, when sharks bite humans, it is not out of predatory instinct… but rather self-defense.
A team of researchers, led by Dr. Eric Emile Germain Clua of the Paris Science et Lettres (PSL) Research University, have reviewed over 60 years of shark bite data and found that activities like spearfishing and handling fish traps often trigger a defensive response. In such cases, the sharks react immediately to human aggression, typically inflicting superficial wounds that are rarely fatal unless unfortunate circumstances, like arterial damage, occur. These defensive bites lack the typical signs seen when a shark attacks out of fear or predation, such as pectoral fin lowering or hunched swimming, and usually involve little tearing of flesh or removal of tissue. Unlike predatory attacks, where significant injury and loss of flesh are common, self-defense bites are swift, sometimes repeated, but comparatively mild.
The waters of French Polynesia, home to over 30 shark species within a 2.1 million square mile (5.5 million km²) exclusive economic zone, provide a unique environment to study shark-human interactions. Since the area was declared a shark sanctuary in 2006, the shark populations have remained relatively healthy, offering a rare opportunity to observe these interactions over decades. The team found that bites classified as self-defense were exclusively initiated after a human acted aggressively toward a shark. Harpooning, speargun strikes, and even rough handling were common triggers. In most cases, the resulting injuries were minor to moderate, reinforcing the idea that the shark's intent was not to hunt or consume but to respond to a perceived threat.
The idea that wild animals defend themselves when threatened is not new. Birds, bears, and even snakes and spiders regularly react defensively to human provocation. However, detailed documentation of this behavior in sharks has been lacking until now. Earlier mentions of defensive shark bites were anecdotal or speculative, without comprehensive data, the scientists argue. But this new analysis confirms that sharks, like many terrestrial animals, may bite defensively when cornered or attacked. Out of all the cases reviewed, a small but consistent percentage — about 5% over a 15-year span — involved self-defense motivations. These incidents were concentrated in areas like the Tuamotu archipelago, where traditional fishing practices remain common.
Sharks biting in self-defense reminds us that they are not villains of the ocean but animals trying ... More to survive in a world increasingly dominated by humans.
The new study also highlights an important caution I personally hope everyone heeds: distressed sharks should not be handled by untrained people. Even a wounded or trapped shark can lash out reflexively, and in these moments, the bite is not calculated or proportionate. Rather, it is an instinctive act of survival, much like a bear swatting at a perceived threat or a bird pecking at an intruder near its nest. By shifting the narrative to acknowledge human responsibility, public attitudes toward sharks could not only become more balanced, but can help prevent unnecessary injuries to both humans and sharks. Sharks are already facing numerous threats from overfishing, habitat loss, and climate change. Misrepresenting their behavior only adds to the challenges they face by justifying unnecessary fear and sometimes lethal retaliation.
Understanding the motivations behind shark bites is crucial for developing non-lethal management strategies. As human presence in marine environments grows, so too does the likelihood of human-wildlife conflict (in French Polynesia alone, an estimated 200,000 spearfishing sessions happen annually). Just as we have learned to modify our everyday behaviors around bears, snakes, and other wildlife to reduce conflicts, we can do the same for animals at sea. Avoiding unnecessary provocation of sharks, educating ocean users about shark behavior, and promoting respectful coexistence can lower risks for both sides. Ultimately, by respecting their space and understanding their responses, we can work toward safer waters and a better future for sharks and people alike.