facts about sharks

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A shark's spiracle is located just behind the eyes which supplies oxygen directly to the shark's eyes and brain. Bottom ...
31/12/2022

A shark's spiracle is located just behind the eyes which supplies oxygen directly to the shark's eyes and brain. Bottom dwelling sharks, like angel sharks and nurse sharks, use this extra respiratory organ to breathe while at rest on the seafloor. It is also used for respiration when the shark's mouth is used for eating.

The blue shark displays a brilliant blue color on the upper portion of its body and is normally snowy white beneath. The...
29/12/2022

The blue shark displays a brilliant blue color on the upper portion of its body and is normally snowy white beneath. The mako and porbeagle sharks also exhibit a blue coloration, but it is not nearly as brilliant as that of a blue shark. In life, most sharks are brown, olive, or grayish.

Vertebrae contain concentric pairs of opaque and translucent bands. Band pairs are counted like rings on a tree and then...
29/12/2022

Vertebrae contain concentric pairs of opaque and translucent bands. Band pairs are counted like rings on a tree and then scientists assign an age to the shark based on the count. Thus, if the vertebrae has 10 band pairs, it is assumed to be 10 years old. Recent studies, however, have shown that this assumption is not always correct. Researchers must therefore study each species and size class to determine how often the band pairs are deposited because the deposition rate may change over time. Determining the actual rate that the bands are deposited is called "validation".

When you flip a shark upside down they go into a trance-like state called tonic immobility. This is the reason why you o...
27/12/2022

When you flip a shark upside down they go into a trance-like state called tonic immobility. This is the reason why you often see sawfish flipped over when our scientists are working on them in the water.

Shark skin feels exactly like sandpaper because it is made up of tiny teeth-like structures called placoid scales, also ...
24/12/2022

Shark skin feels exactly like sandpaper because it is made up of tiny teeth-like structures called placoid scales, also known as dermal denticles. These scales point towards the tail and help reduce friction from surrounding water when the shark swims.

Sharks have small black spots near the nose, eyes, and mouth. These spots are the ampullae of Lorenzini – special electr...
20/12/2022

Sharks have small black spots near the nose, eyes, and mouth. These spots are the ampullae of Lorenzini – special electroreceptor organs that allow the shark to sense electromagnetic fields and temperature shifts in the ocean.

Based on fossil scales found in Australia and the United States, scientists hypothesize sharks first appeared in the oce...
18/12/2022

Based on fossil scales found in Australia and the United States, scientists hypothesize sharks first appeared in the ocean around 455 million years ago.

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