All sharks great and small

Sharks (elasmobranchs) have been on earth almost unchanged since the time of the dinosaurs.
There are about 400 species of known sharks. The largest shark is the plankton eating Whale Shark reaching up to almost 14 metres long. The smallest is the Spined Pygmy Shark at less than 18 cm long. 

CSIRO Shark research page

International Plan of Action for the Conservation and Management of Sharks

International Shark Attack File (ISAF)

WHERE CAN I GO DIVING WITH SHARKS?

• Port Lincoln, South Australia
• Cape Town, South Africa
• Tahiti
• The Bahamas
• Southern California, USA
• Rhode Island, USA
• Isla Holbox, Mexico