Whale sharks swimming in heavy oil four miles from Deepwater

Swimming with a whale shark off the Alabama coast

This week's report: Three whale sharks swimming in heavy oil four miles from the gushing Deepwater Horizon wellhead. "Our worst fears are realized. They are not avoiding the spill area," said Eric Hoffmayer, the University of Southern Mississippi scientist who found the large aggregation last week. "Those animals are going to succumb. Taking mouthfuls of oil is not good. It is not the toxicity that will kill them. It's that oil is going to be sticking to their gills and everything else."

Whale sharks, the largest fish on earth, feed by filtering plankton and tiny fish from the water through sieve-like mechanisms in their mouths.

"Based on all the information I'm getting, they are doing the normal things regardless of the oil. The idea that sharks have these evolved senses that will protect them -- well, they haven't evolved to detect oil," Hoffmayer said.

He tagged whale sharks on the Ewing Bank in June of last year. The satellite trackers showed that some of the animals spent that July migrating hundreds of miles toward the Alabama coast and Florida Panhandle. If they follow the same route this year, it would carry them straight through the heart of the spill. More...