The 2007 Manatee mortality statistics from the Florida Fish and Wildlife Conservation Commission:

Watercraft - 73

Flood Gate/Canal Lock - 2

Other Human - 5

Prenatal - 59

Cold Stress - 18

Natural - 81

Undetermined - 67

Unrecovered - 12

Total number of Manatees killed/died - 317

Below is a brief description of what each category is:

Watercraft: Manatee mortalities caused by the crushing impact of the hull and/or slashing of the propellers. In the case of large power vessels and barges moving through shallow waters, manatees may be caught between the vessel and the water bottom, or the vessel and a docking structure, and crushed

.Flood Gate or Canal lock: Manatee mortalities caused when the animal is crushed and/or drowned in these structures.

Other Human-Related: Manatee mortalities caused by monofilament line, fishing nets, fishing hooks, litter, poaching or other human activities.

Prenatal: A dependent calf less than 150 cm (about 5 feet) that died around the time of birth and was not determined to have died from human-related causes.

Other Natural: Mortalities caused by natural circumstances such as cold stress, red tide, gastrointestinal disease, pneumonia and other diseases.

Undetermined: The manatee is too badly decomposed to determine cause of death, the necropsy finding is inclusive, or the manatee carcass was reported and verified, but not recovered.