Spiny dogfish sharks are the most abundant shark in the world. This means that fisheries do not think that they can be over fished. Wrong. They totally can be. These sharks are used for fish 'n chips in the UK and are fished for many other reasons, mostly for humans to eat. These sharks are not dangerous to humans, unless provoked. These sharks are named for the spines on their dorsal fins. These sharks grow up to 4 feet long and can have 1-20 pups.