Deprecated: Hook custom_css_loaded is deprecated since version jetpack-13.5! Use WordPress Custom CSS instead. Jetpack no longer supports Custom CSS. Read the documentation to learn how to apply custom styles to your site: in /home/users/waleedkhalid/www/ on line 6078
Do Sharks Sleep?

Do Sharks Sleep?

October 20, 2017
1 min read

Whether sharks go to sleep or not scientists have yet to figure it out. As long as they keep on swimming for seemingly indefinite period of time, it’s hard to keep track of them. As a result, it was long believed that sharks go on swimming without a break. This may be true for some species but not all of them exhibit such behavior. Though sharks like Great White shark do not doze off like us but have restful periods. Like other fish, they have to keep swimming in order to extract oxygen from water for respiration.

As oxygen passes through their gills, they tend to breathe and this way keeps themselves alive and healthy. In order to get more and more oxygen, few sharks tend to pick up the pace in swimming. This is important particularly because when sharks lose energy to pump oxygenated water through the gills, they seek to accelerate which in turn helps them pumping more oxygen. Such species are called obligate ram ventilators.

When scientists did research to the spiny dogfish, they came to know that its spinal cord was actually involved in coordinating the movements underwater instead of brain. This means sharks can actually take a break and allow their brain to relax while swimming at the same time.

The gill slits of sharks are located behind the head and are open. Sharks that lie on the sea floor have an actually modified version of gill slits. This gill slit is known as spiracle. It is located behind the eye and it helps them pump oxygen continuously from water. The spiracles are only present in bottom-dwelling sharks like nurse sharks and whitetip reef sharks. It is observed that bottom-dwelling sharks often relax in the caves underwater. This is because the oxygen content in these places is high.

Sharks like horn sharks have an internal timer called circadian rhythm that tells them the precise time to take a break.

Latest from Blog

Cane Rat (Thryonomyidae)

Cane rats are robust rodents with stocky bodies, small ears, and short tails; body covered with sharply pointed, but pliable, spiny hairs; broad, heavily built orange-colored chisel-shaped incisors, with the upper ones grooved longitudinally at the front. They will make habitats in grasslands and wooded savanna. What Do Cane Rats…

What Do Antbirds Eat?

Antbirds (Formicariidae) are small to medium-sized songbirds with short, rounded wings, a short or long tail, and a stout or slender bill slightly hooked at the tip, feed on insects on the ground or in trees or thickets; prey is usually gleaned from foliage, although some species also catch flying…

Where Do Mountain Beavers Live?

Mountain beavers do not hibernate and so are active throughout winter. They are primarily nocturnal but are frequently active for short periods during the day. Mountain Beaver Habitat Habitats used by mountain beavers vary, but are typically forests with dense patches of herbs and shrubs. This vegetation supplies not only…

What Do Pangolins Eat?

Pangolins love munching on bugs, especially ants and termites. They sniff out their insect feasts, and sometimes the big pangolins go for the larger bugs. What’s on the menu can change depending on what’s available or the time of year. What Do Pangolins Eat? Pangolins can be a bit choosy,…

Proper Nutrition for Pets

Pet care is a complicated topic, as it is challenging to come to a single opinion. However, most owners will agree that the choice of food has a substantial impact on the condition of cats and dogs. Since much depends on the correct determination of needs, it is worth paying…
Go toTop