Sharks don't have scales. They have skin.
Actually they have a kind of teeth on their skin called denticles.
Shark skin looks and feels like it is covered with tiny teeth. In fact, their small, rough placoid scales (also called denticles), have the same structure as sharks' teeth! Shark skin is sometimes used as sandpaper.www.vanaqua.org/education/aquafacts/sharks.html
Shark teeth are made of dentin, a hard tissue similar to bone, covered by a layer of enamel. They have a conical shape and are constantly regenerating throughout the shark's life to replace lost or worn teeth.
Sharks are covered in scales called denticles, which are made of the same material as their teeth, giving them a rough texture. These denticles help reduce drag when swimming and protect the shark's skin.
A shark is a type of fish, specifically a cartilaginous fish. They have skeletons made of cartilage rather than bone, and are known for their sharp teeth and streamlined bodies built for hunting in the ocean.
Jawless fish do not have scales, so their skin is naked. They also do not have jaws or paired appendages. They do, however, have a cartilaginous skeleton and a dorsal nerve cord that leads to a distinct brain.
scales
Scales
The outermost layer of most fish is scales.
They are actually covered in bony plates and NOT in scales.
spiky skin, hard scales shark
Shark skin is not soft and smooth as they it is covered in specialized scales. These scales are called placoid scales or dermal denticles.
no
Dermal denticles. Literally, "skin teeth." They are similar in structure to the teeth of a shark. See http://en.wikipedia.org/wiki/Dermal_denticle
its simply because they lay eggs, they're cold-blooded and are coverd in scales
Scales
all fish have scales, including sharks. their scales are just smaller than what you would normally think of as scales
Shark