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You can download the Doucment about the Fin Trade by clickin gon the P
Sharks are top predators. They did not evolve to be hunted. Most shark species are slow to mature and reproduce only once a year or every other year, and when they do, may only have a few pups at a time. They do not reproduce like other fish, which may lay thousands of eggs within their first few years of age, and continue to do so frequently. Therefore sharks cannot recover easily from over fishing.
Once mature animals are taken from an area, it can take more than a decade for the next generation to be ready for reproduction. Sharks had few predators for hundreds of millions of years until humans began to aggressively target them about 30 years ago. In this short time shark populations have been drastically impacted. Some have declined by 90-99% in several areas where they were naturally plentiful.
Rays are closely related to sharks as are all Elasmobranchs. Like sharks, large-bodied rays are slow to reproduce and are therefore highly susceptible to overfishing. Manta and mobula rays are finned, just like sharks.