Sharks reproduce at a very slow rate. They mature late and bare very few offspring. It takes some sharks anywhere from six to eighteen years, or longer, to mature sexually.
Many sharks reproduce once a year, but there are some that can only do so every other year.
Many species in our waters appear to be abundant, but exact numbers can not be determined due to a wide range of area that they cover. Sharks are known to be a highly migratory species. They may travel long distances in their lifetime. This is far from the truth. An attack on a human rarely happens.