A: All sharks are fish. Like any other fish sharks have gills for breathing, a backbone, and live in water. Unlike bony fish, sharks and their cousins the stingrays and skates have skeletons made of cartilage instead of bone. The only part of their body that is hard like bone is their teeth.

How are fish and shark the same?

Sharks are fish. They live in water, and use their gills to filter oxygen from the water. Sharks are a special type of fish known because their body is made out of cartilage instead of bones like other fish.

What do shark and fish have in common?

Fast Facts. Sharks are fishes and most have the typical fusiform body shape. Like other fishes, sharks are ectothermic (cold-blooded), live in water, have fins, and breathe with gills.

Are sharks and fish closely related?

Sharks are equally related to all bony fishes and all land vertebrates including humans, despite the fact that they are indeed fish.

How are sharks and bony fish similar?

The skeletons of sharks and other Chondrichthyans are made of cartilage, unlike human skeletons which are made of bone. Sharks, like bony fish, breath (respire) when water passes through their mouth, over their gills, and out through their gill slits.

What makes a fish a shark?

Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the rays.

How many gills does a shark have?


Sharks can have up to seven external gill openings, but most species have five. Gill arches are considered part of the skeleton; they hold the gills in place. The arches support one or two rows of gill filaments.

How are fish similar?

All fish share two traits: they live in water and they have a backbone—they are vertebrates. Apart from these similarities, however, many of the species in this group differ markedly from one another. Fin fish like salmon have gills, are covered in scales, and reproduce by laying eggs.

Do sharks have gills?

The breathing process for sharks begins and ends with their gills, which they use to both extract oxygen from water and rid their bodies of carbon dioxide. Here’s the quick version of how it works, according to Sharkopedia: As water passes over the gills, small capillaries allow oxygen to enter the bloodstream.