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Viviparity is the gestation of young without the use of a traditional egg, and results in live birth. [83] Viviparity in sharks can be placental or aplacental. [83] Young are born fully formed and self-sufficient. [83] Hammerheads, the requiem sharks (such as the bull and blue sharks), and smoothhounds are viviparous. [72] [80]
Sharks do not have moveable upper or lower eyelids, but the tiger shark—among other sharks—has a nictitating membrane, a clear eyelid that can cover the eye. [32] A reflective layer behind the tiger shark's retina , called the tapetum lucidum , allows light-sensing cells a second chance to capture photons of visible light.
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.
The eggs receive oxygen and protection, and gestation lasts from 14 to 28 days, after which the male gives birth to live young known as fry. Image credits: Debbie Graham #30 There Are Mosses That ...
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]
Get excited for the 35th official Shark Week, from July 23 to July 29, with these shark facts.
All cartilaginous fishes—the elasmobranches (e.g., sharks, rays, and skates)—employ internal fertilization and usually lay large, heavy-shelled eggs or give birth to live young. The most characteristic features of the more primitive bony fishes is the assemblage of polyandrous (many males) breeding aggregations in open water and the absence ...
Yoko, a baby swell shark, swims in a tank at Shreveport Aquarium in Shreveport, Louisiana. The shark hatched from an egg on Jan. 3, 2025. Aquarium staff are unsure how the egg came to be, as ...