The majority of shark species are ovoviviparous. In basic terminology, this means that, after fertilisation, eggs are formed and hatched inside the mother before live young are born into the surrounding water. During mating, the male shark inserts the clasper (similar to the mammalian penis) into the female’s oviduct and releases sperm.
Ovoviviparity (aplacental viviparity) is a mode of reproduction in s harks (and other animals) in which embryos develop inside eggs that are retained within the mother's body until they are ready to hatch. Ovoviviparous sharks are similar to viviparous species in that there is internal fertilization and the young are born live, but differ in that there is no placental connection and the unborn...
The number of young born at a time depends on the species. Basking sharks are ovoviviparous and give birth to one or two live young. In the case of the garter snake, the young are born still enclosed in an amniotic sac but they escape it quickly.
The whale shark is now classified as ovoviviparous rather than oviparous, because extrauterine eggs are now thought to have been aborted. Most ovoviviparous sharks give birth in sheltered areas, including bays, river mouths and shallow reefs. They choose such areas for protection from predators (mainly other sharks) and the abundance of food.
The nurse shark is an ovoviviparous species. This means that embryonic development occurs in an egg case within the mother’s ovary. The embryo has its own yolk sac, which is absorbed during development, and there is no placental nourishment from the mother. The nurse shark has a biennial reproductive cycle.
Ovoviviparity. Ovoviviparous animals are similar to viviparous species in which there is internal fertilization and the young ones are born alive, but differ in that there is no placental connection and the unborn young ones are nourished by egg yolk; the mother's body does provide gas exchange (sharks and rays).. In some species, the internally developing embryos rely solely on yolk.
A is correct. This shark is viviparous because it supplies nutrients to its offspring in a form other than a yolk sac. Other sharks that do not form vascular connects with their embryos are still ovoviviparous sharks, and the sharks are often born right away or eat each other for continued nourishment during development.
In some species of shark, the first shark to hatch from their egg will then consume the other shark fetuses and their yolk sacs. This form of fetal cannibalism helps ensure only the strongest pups survive. Sharks that are ovoviviparous give birth to very small litters with only 1-8 pups. Ovoviviparous shark species include: Cookiecutter Sharks
Hammerhead Sharks, the Blue Shark, Bull Shark and Smoothhounds are viviparous shark species. This means that the female keeps her embryos inside her oviduct, feeding them from a placenta, until they are ready to be born. Mating occurs between a male and a female shark, during which he enters her oviduct with his clasper and deposits sperm.
Oviparous (egglaying) Sharks After Compagno 1984b, Compagno 1988, Compagno 1990a, Dulvy 1998. Shark eggcases are very popular when on exhbit in the Kelp Lab of the Monterey Bay Aquarium. I thought that eggcases occured in 4 shark families (but it is 6 with one species each for 2 families) but did not realize that there were over a hundred sharks (~25% of all sharks) which lay eggs.