A big year for shark and ray conservation

This is a big year for sharks at the COP19 in Panama, as more than 60 species are being proposed for listing on CITES.   Sharks are traded globally for their meat, fins, cartilage, and increasingly for liver oil, which is used to produce squalene for cosmetics and other uses. The trade of shark products […]

Do all sharks lay eggs?

The reproductive modes of elasmobranchs are surprisingly varied and complex, but generally fall into two broad categories: oviparity (egg laying) and viviparity (live birth of fully developed young). About 40% of shark species, and all species of skates, lay eggs.    Also called mermaids purses, the egg cases are usually attached to substrate, such as […]