salinity of water closer to the shoreline because a lot of these attacks have happened in water up to your calf or hip, not deep out in the midst of the ocean. >> that's usually the case though. you have millions of people going in the same waters that are thousands or millions of sharks that are feeding for over 400 million years in those waters. you are going to get incidents occasionally of a hit. not necessarily on purpose, but mistakes happen and it may be that this year we are getting additional mistakes. so far i'd say it's not extremely alarming. it's horrible and horrific for those who get into those accidents but in the long run we really have to see over the year if we have a much higher incident rate than we do right now. >> what can people do? i have sort of always been very afraid of sharks. i may stay on the beach but really a lot of people that want to go in, what can they do certain times to swim not? >> it's a fear of the unknown. by and large they try and avoid you because you are not on their