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The hammerhead sharks exhibit a viviparous mode of reproduction with females giving birth to live young. Like other sharks, fertilization is internal, with the male transferring sperm to the female through one of two intromittent organs called claspers. The developing embryos are at first sustained by a yolk sac.
This then allows the female to give birth to live young, although some do lay eggs. This image depicts a squalus acanthias shark dissection where this female happened to be pregnant with multiple shark pups. This image is important as it shows how sharks can give birth to multiple live young. [20]
The bamboo sharks (Hemiscylliidae) and the zebra shark (Stegostomatidae) lay eggs on the bottom, while the other carpet sharks give live birth. The egg cases are oval and covered with adhesive fibers that serve to secure them to the bottom.
Bull sharks mate during late summer and early autumn, [10] often in bays and estuaries. [57] After gestating for 12 months, a bull shark may give birth to 1 to 13 live young. [10] [58] They are viviparous, born live and free-swimming. The young are about 70 cm (27.6 in) at birth.
The males do not have to compete with other males, and female anemone fish are typically larger. When a female dies a juvenile (male) anemone fish moves in, and "the resident male then turns into a female and reproductive advantages of the large female–small male combination continue". [22] In other fishes sex changes are reversible.
Get excited for the 35th official Shark Week, from July 23 to July 29, with these shark facts.
Just weeks before a pregnant porbeagle shark was expected to give birth, one of the two tracker tags marine scientists had placed on the animal floated to the surface near Bermuda. The team hadn ...
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. Dogfish have the longest known gestation period of any shark, at 18 to 24 months.