CNN) -- Hurricane Katrina killed most of the fish in the New Orleans Aquarium of the Americas, the American Zoo and Aquarium Association Web site reported.
The animals were killed when the facility lost power and the staff had to evacuate.
A small staff is tending to the surviving animals and preparing to move them out of the facility, which is at the foot of Canal Street along the Mississippi River.
The Aquarium of the Americas was considered one of the foremost aquariums in the world, the conservation Web site Mongabay.com said.
"It had 10,000 fish representing more than 530 species and featured four enormous exhibits -- Mississippi River gallery featuring catfish, paddlefish and alligators; the Caribbean Reef exhibit featuring a clear, 30-foot-long tunnel surrounded by aquatic creatures; the Amazon Rainforest display featuring piranhas and tropical birds; and the Gulf of Mexico exhibit featuring sharks, sea turtles and stingrays -- in addition to a number of smaller displays."
Some animals survived the loss of power, the American Zoo and Aquarium Association Web site reported.
"The sea otters, penguins, leafy and weedy sea dragons, birds (macaws and raptors), and the white alligator are fine," the association said on its Web site
"Midas, the infamous 250-pound sea turtle, survived and has been coaxed into the holding area in the Gulf of Mexico Exhibit," the association said.
Air pumps are key for an aquarium, according to Mongabay.com.
"Aquatic plants, animals, and waste-converting bacteria all depend on oxygen dissolved in water for respiration."