As many people have believed in the past, sharks do in fact can see colours, and do indeed have very good eyesight. Avoid wearing the colours of orange and yellow, as this can aggravate the shark, and possibly lead to attacks. Sharks are in fact attracted by splashing and vibrations in the water, and it can sometimes be attributed to attacks. Most scientists have not been able to predict why and where sharks attacks. Do not stay in the water with blood around you.
Sharks can smell blood from over a mile away.
And, for the women who read this, if you are in the middle of your menstrual period, please stay out of the water for your own sake. Do not swim in waters that have been deemed dangerous. Avoid swimming in murky waters. Finally, if you don't feel right in the water. Most shark attacks are not fatal, however, there are a percentage of attacks that are fatal.