15 dead sharks wash ashore in Manatee County, Bay News 9, April 22, 2011:
A mystery is brewing on Manatee County's beautiful beaches [...] Recently more than a dozen dead sharks were found on the north ends of Longboat Key and Anna Maria Island.
"There were no real indicators of what went wrong with them," Dr. Nick Whitney, Staff Scientist for the Center for Shark Research at MOTE Marine Laboratory said. "There are no obvious signs of damage from fishing or net damage or anything like that." [...]
"Oil spill is pretty unlikely because these animals tend to be coastal," said Whitney. "They move up and down coast, but they wouldn't tend to go off shore and in deep water where oil is." [...]
MOTE researchers say finding a dead shark now and then is not rare, but it is uncommon to find a group of them dead within a few days.