TAMPA, Fla. -- Zoo officials say a total of 15 manatees are being cared for at a Lowry Park Zoo hospital devoted to the marine mammals.

Previously, the highest number admitted at one time to the David A. Straz Jr. Manatee Hospital was 14 in 2003 and 2006.

The newest patients are a 1,625-pound cow and her 69-pound male offspring.

About $1 million is spent annually on its manatee rehabilitation program.

Officials say it costs about $300 daily to feed an adult manatee and about $30,000 to treat each manatee for one year.

Since opening the Florida Manatee and Aquatic Center in 1991, the zoo has treated 200 manatees, successfully rehabilitating and releasing half the patients to native habitats.