Issue 36, Winter 2024

The Next Generation of Sharks: Reproductive Modes in Elasmobranchs

Eggs, Pups, and Claspers - Oh My!

Elasmobranchs (sharks, rays, and skates) are an incredibly diverse group offishes, with over 1,000 documented species worldwide! Reproductive modeswithin elasmobranchs are equally diverse and range from egg-laying toplacental-fed live birth. While bony fishes spawn by releasing sperm and eggsinto the water column, which results in young developing apart from theparents, elasmobranchs reproduce through internal fertilization. Also, male andfemale elasmobranchs are externally distinguishable. Male sharks possessclaspers, or external reproductive organs, whereas females do not.Interestingly, female elasmobranchs typically have one functional ovary and twopaired uteri, which increases the capacity for pup production and development.

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