Don’t swim at dawn or dusk, when many sharks feed. Don’t swim in murky water, especially near river mouths. Don’t urinate in the water, or swim if you’re bleeding. Don’t thrash around too much, or swim with a dog, or near schools of fish. Spearfishing, and to a lesser extent surfing, will definitely raise the odds of a bite. Don’t wear shark-attracting contrasting colours, particularly not the safety yellow favoured by coastguards – researchers call it ‘yum-yum yellow’. Pulling a shark’s tail is strongly discouraged.
- Why Do Sharks Attack People (wanttoknowit.com)