Shark underwater menacing

Sharks are essential marine predators for ocean balance, but their reputation as 'killers' is exaggerated.

About this subject

Sharks have existed for over 400 million years, predating even dinosaurs. With more than 500 species, they range from the small lantern shark (only 20 cm) to the enormous whale shark (up to 12 meters). Despite their menacing image, attacks on humans are rare: an average of 80 unprovoked incidents worldwide per year, resulting in fewer than 10 deaths. In comparison, about 100 million sharks are killed annually by humans, mainly due to overfishing and the fin trade.

These cartilaginous fish play a crucial role as top predators, controlling prey populations and maintaining the health of coral reefs and marine ecosystems. Many species are threatened with extinction: the IUCN lists 32% of shark species as vulnerable or endangered. In Brazil, the hammerhead shark and tiger shark are common along the coast, especially in Fernando de Noronha and Abrolhos, where responsible tourism observation is growing.

The 'menacing' behavior is often misinterpreted. Sharks may swim with mouths open to breathe better or display defensive postures. The myth that they need to constantly attack to survive is false: they have a slow metabolism and can go weeks without eating. Understanding their biology and ecology is vital to promote conservation and avoid irrational fear.

Frequently Asked Questions

How many species of sharks exist?

There are over 500 species of sharks worldwide, ranging greatly in size and habitat.

Do sharks attack humans frequently?

No. Unprovoked attacks are rare, with about 80 incidents per year globally. Most species are not dangerous to humans.

Why are sharks important for the ocean?

As top predators, they control prey populations and help maintain ecological balance, preventing degradation of reefs and habitats.