Shark Senses

Many species of shark have brains as complex as those of mammals. Enabling them to process a wide range of senses.

Sharks have the same 5 senses as we do but can also sense electrical currents and pressure changes.

SMELL

Up to two thirds of the total weight of a shark's brain is dedicated to smell.

They’re super-sensitive to smells that are important to their survival. Including scents produced by potential predators, prey or a mate.

Some sharks can detect the blood of prey from a huge distance - one part of blood to one million parts of water. That's equal to one teaspoon in an average sized swimming pool.

SIGHT

Light doesn’t travel well through water. So sharks need to maximise the amount available to help them see. With eyes positioned on the side of their head they're able to see in almost all directions. But, their vision becomes more acute 15m from an object. It's not until this point that sight becomes their dominant sense.

Like cats, sharks also have a ‘tapetum lucidum’. A reflective layer of shiny cells that lies behind the retina. This improves vision in low light conditions, allowing nocturnal and deep-water species to hunt effectively. It also gives their eyes a green glow in the dark.

SOUND

Sharks have an acute sense of hearing and are sensitive to low-frequency signals. They're able to track sounds and are particularly attracted to sounds made by wounded prey.

Their ears are located on either side of their head, behind the eyes. From the outside these are visible as 2 small holes. These are made up of 3 cartilage tubes filled with fluid and lined with hair cells. Sound waves cause these tiny hairs to vibrate and the brain then interprets the sound.

TOUCH

Sharks have many nerve endings under their skin. Some also have barbells around their mouth that can be used to probe the sand for prey.

Their teeth also contain many pressure sensitive nerves. Lacking hands to feel, sharks will use their teeth to learn more about an object. Being highly inquisitive creatures this can cause a lot of problems. A ‘test bite’ from a large shark can be fatal to unintended prey such as humans.

As well as direct touch, sharks experience distant touch through their lateral line. Find out more about this below.

TASTE

The taste organs of a shark are not as highly adapted as their other senses, because taste doesn't help them find food.

But they'll often ‘test bite’ potential food to see if it's palatable. If it's not they'll spit it out.

This could account for the high survival rate of shark victims. Where sharks have bitten people then left without further incident.

ELECTRORECEPTION (ampullae of Lorenzini)

Sharks have a complex electro-sensory system. Enabled by receptors covering the head and snout area. These receptors sit in jelly-filled sensory organs called the ampullae of Lorenzini. These tiny pores are extremely sensitive and can detect even the faintest of electrical fields. Such as those generated by the Earth’s geomagnetic field or muscle contractions in prey.

Hammerhead Shark © Tim Priest

Hammerhead sharks can find prey that’s completely buried under the sand. Making them experts at hunting stingrays.

The Earth’s geomagnetic field is thought to help sharks orientate themselves and navigate the world’s oceans. This could explain how they’re able to migrate huge distances so accurately.

PRESSURE CHANGES (Lateral Line)

The lateral line is responsible for alerting a shark to potential prey and predators. It’s made up of a row of small pores that run all the way from the snout to the tail. Surrounding water flows through these pores and special sensory cells sense any pressure changes.

The lateral line also gives a shark spatial awareness and the ability to navigate. Their own body movement creates waves that bounce off obstacles (such as reefs), enabling them to create a pressure map of their surroundings.

There's no human equivalent of this sense, as air isn't dense enough to feel any pressure differences.

Love Discovering Sharks?

Why not join us today? As a member you'll receive our Shark Focus Magazine twice a year. Keeping you up to date with all the latest news about sharks and their conservation!

Join Us

Latest

Shark Shorts

The Shark Trust's short animated video series explaining the basics of what sharks are and what we can do to protect them
What is a Shark?

In this video we answer the very important question - what is a Shark? We dive into the differences between Sharks and other fish, and how other (unexpected) animals are also predators in the ocean.
Comparing Sharks

In this video we compare some of the different Sharks that occur across the world. From the ones we all know, like the Great White, to the weird and wonderful like the Wobbegong Sharks.
Caring for Sharks

What impact do Sharks have in our oceans? In this video we dive into how we value Sharks and why they're important.

Shark Evolution

Most scientists believe that sharks came into existence around 400 million years ago. That's 200 million years before the dinosaurs! Find out more about the history of sharks...
Shark Taxonomy

Taxonomy is a field of science that involves classifying and naming species. It's integral to wildlife conservation, providing the bedrock for our understanding of sharks.
Shark Anatomy

Sharks have a range of adaptations that make them perfectly suited to their environment. It's no wonder they've gained a reputation for being some of the most impressive and formidable predators on the planet!
Male & Female Sharks

How do you tell the difference between a male and female shark? Click here to find out about physical and behavioural differences, as well as shark courtship...
Shark Reproduction

Sharks invest a lot of energy into producing a few, well-developed young. There are 3 main methods of reproduction: oviparity (egg-laying), ovoviviparity and vivparity (live birth).
Tonic Immobility

Tonic immobility is a reflex that causes a temporary state of inactivity in an animal. Similar to hypnosis. It occurs in a variety of different species, including many sharks and rays...