studying and tagging shark foss 15 years. he says this is time of many of his tagged sharks are near increasing in. >> also of the sharks we tag in miami and there now, but we think they're there to feast on loggerhead turtles. >> you can see it right off the coast of the outer banks, but says a renal for an uptick of sharks could be for from a number of factors. >> if there's a bunch of small fish that's coming in shore or aggregating or following nutrients, certainly big sharks can be following, have them enter acting with people more. >> reporter: shark bites are still trimly rare because sharks aren't necessarily swimming around looking for you. >> sharks are not the huge killers. when you look at the number of people who are actually injured