>>718410148
Sharks are difficult. Because they keep growing as they age and don't stop, they can get pretty big. However they use cartilage rather than bone, they can grow and shrink in size rapidly depending on conditions. For example, the largest female white shark recorded is Deep Blue at 6.4 m (21 ft), when pregnant like pic related. When she's not porked up she's only 5.8m (19 ft).

So consider now a fictional shark in JAWS.Iin the book he's a male shark at 6.1m (20 feet) but in the film he gets bumped up to 7.62m (25ft).