Question

How does shark reproduction differ from the reproduction of fishes?

Answer 1

Viviparity is the most advanced method of reproduction. The baby shark develops inside their mother's body, receiving nutrients and oxygen through a duct. This is often an equivalent method employed by mammals. But, unlike mammals, when the pups are born they're immediately independent and need to defend themselves.

Complete answer:

Shark	Fish
In sharks the eggs are fertilised inside the uterus, which is really a modified part of the oviduct. A shark has two uteruses. The eggs hatch inside the shark and therefore the juvenile grows there itself before emerging out as a replacement shark.	In most fish, large numbers of eggs and sperm are dispensed into the water and eggs are fertilized outside of the body. Mortality is high.
Sharks and fishes, however, are very closely related. In fact, sharks are a kind of fish.	Fish are divided into two groups supporting their skeleton, which is why sharks are technically fish, though not what we traditionally consider once we imagine a fish.
Sharks have skeletons made out of cartilage, an equivalent material your nose and ears are made out of. In contrast, fishes have skeletons made out of bones. fish are called Osteichthyes; and chondrichthyan are Chondrichthyes.	Fishes are defined as any group of cold-blooded animals that live their whole lives within the ocean which have a backbone, fins, and gills.

Note: Sharks are known for his or her rough skin, while most fish are smooth and slick. The difference between the 2 is that the majority fish are covered in scales (either cycloid, ctenoid or ganoid) giving them their slick feel. Almost like determining the age of trees, a fish’s age is often determined by counting the amount of rings on its scales.