In the past week, scientists have been cheering at their discovery of what appears to be one of the biggest whale shark groups ever seen in the northern Gulf of Mexico. There were 100 of the amazing creatures feeding on the surface over a deepwater feature known as Ewing Bank, which is located off of Louisiana.
However their cheering was short lived as one of their worst fears was confirmed… They are not avoiding the spill area. Eric Hoffmayer, a scientist with the University of Southern Mississippi, had this to say on the subject, “Our worst fears are realized. They are not avoiding the spill area, 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 are the largest fish on the planet. They feed by filtering plankton and other tiny sea animals from the water through a colander like feature in their mouths. As mentioned before, it is not the ingestion of the oil that is the major problem, although it is not healthy for the Whale sharks.
“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.
Hoffmayer had been tagging Whale sharks on the Ewing Bank in June of last year. The trackers he managed to get onto the whale sharks showed that some of the animals spent July making their way hundreds of miles toward the coast of Alabama and the Florida Panhandle. If they follow the same pattern this year, it will put them smack dab in the middle of the oil spill.
Not a lot is known about the migratory patterns of the whale shark, and they are not sure exactly how many of them make their home in the Gulf of Mexico.
The best way to get a handle on their comings and goings of the whale shark is by utilizing photographs of the spots and the bars on their sides. These patterns are as unique to the whale sharks as fingerprints are to us.
Hoffmayer has warned that the implications are far more grand than they appear to be.. “Last year we had two sighted off Florida and Alabama that were from Honduras and Belize,” Hoffmayer said. “That means these oil impacts are not only for the Gulf population, but for the Caribbean and maybe even further. The implications are pretty big here.”
He also said that the relatively high temperatures in the Gulf of Mexico, and the position of the offshore Loop Current, signifies that the environmental conditions in the Gulf this year, are extremely similar to the conditions which drew the whale sharks to the same area last year.
This all adds up to big trouble for the poor whale shark.. one can only hope a solution is found quickly.