The blue shark is also known as Prionace glauca. The way that blue sharks reproduce is very interesting. During reproduction, the male is very aggressive, as it bites the female. This biting doesn't hurt the female due to extremely thick skin. The biting has a very important purpose: it keeps the male and female from separating in order for the sperm to be placed inside the female. A litter of blue shark pups varies and can be from 4 pups to 130 pups. The pups are left to care for themselves after they have been born.
This picture shows a male shark biting and female shark while mating.