There are numerous discrepancies over the size of the largest great white ever caught, but the Canadian Shark Research Center claims that the largest, accurately measured great white shark was caught in 1988 off Prince Edward Island and was a length of 20 feet. Other recorded shark captures seem to be exaggerated or miscalculated, according to scientists who study marine life.
For years, a shark caught off the coast of Malta was believed to be the biggest great white at 23 feet, but recent research suggests that the length was exaggerated. One reason it's difficult to accurately measure a great white shark is that over time the shark begins to dehydrate and shrink as water leaves the body. What may seem like 7,000 pounds and 23 feet may actually be closer to 4,000 pounds and 16 feet.