TALLAHASSEE, Florida -- A cold-related die-off of manatees in early 2011 set the stage for a third straight year with high numbers of deaths for the species. Biologists with the research arm of the Florida Fish and Wildlife Conservation Commission (FWC) documented 453 manatee carcasses in state waters in 2011.

During the past three years, biologists documented the highest levels of cold-related manatee deaths, with the "cold stress" category accounting for 112 in 2011, 282 in 2010 and 56 in 2009. In the previous five years, cold stress accounted for an average of 30 manatee deaths per year.

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