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So, while most sharks will be 100% fine if they stop swimming, a few iconic species such as great white sharks, whale sharks, hammerheads and mako sharks would suffocate without forward motion or a strong current flowing towards their mouths.
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Read More »There's a common notion that sharks need to swim continuously or they will drown. This myth has certainly become an overused trope when it comes to motivational quotes, but is there any truth to it? Can a shark actually drown if it stops swimming? Let’s investigate! Sharks have two methods of breathing, i.e. getting oxygen-rich water to flow across their gills. The first method is “ram ventilation” – the shark swims with its mouth open and its speed pushes water through its gills, if it stops swimming, it stops breathing. The second method is called “buccal pumping”, which is basically a process where they use their cheek muscles to suck water through their gills. Many of these sharks make obvious use of this technique by lying completely still on the seabed, sucking water in through spiracles (modified tubes just behind their eyes) so that they can keep their mouths closed while breathing. You might be forgiven for thinking that most sharks do not fit the cheek-sucker description, but the reality is that of the over 400 species of shark that currently inhabit our ocean, only about 20 of them are “obligate ram ventilators”. In other words, most sharks suck. Most sharks use a combination of these two techniques, switching back and forth depending on how fast they are swimming. Even stereotypical-looking sharks, like the ragged-tooth sharks in the Save Our Seas Foundation Shark Exhibit at the Aquarium, are capable of this, using buccal pumping to supplement their ram ventilation when they are swimming at slow speeds. So, while most sharks will be 100% fine if they stop swimming, a few iconic species such as great white sharks, whale sharks, hammerheads and mako sharks would suffocate without forward motion or a strong current flowing towards their mouths. In answer to our titular question – NO, most sharks will not drown if they stop swimming. Which brings us to another question: Can sharks swim backwards? (You'll need to wait and see!)
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Read More »Some sharks such as the nurse shark have spiracles that force water across their gills allowing for stationary rest. Sharks do not sleep like humans do, but instead have active and restful periods.
Sharks have eyes that are similar to the human eye with some exceptions. Sharks have the ability to open and close the pupil in response to differing light situations similar to humans while most fish do not possess this ability. A shark’s eye also includes a cornea, iris, lens, and retina. Rods and cones are located in the shark’s retina, allowing the shark to see in differing light situations. Recent work has suggested that most sharks do not see in color. In addition, sharks, similar to cats, have a mirror-like layer in the back of the eye referred to as the tapetum lucidum. This layer further increases the intensity of incoming light, enhancing the eye’s sensitivity to light. Although it was once thought that sharks had very poor vision, we now know that sharks have sharp vision. Research has shown that sharks may be more than 10x as sensitive to light as humans. Scientists also believe that sharks may be far-sighted, able to see better at distance rather than close-up, due to the structure of the eye. Vision varies among species of sharks due to differences in the size, focusing ability, and strength of the eyes.
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