Three leading Georgia Aquarium officials have left their jobs, two of them through resignations.

Ray Davis, senior vice president of zoological operations and one of the top officials under former Executive Director Jeff Swanagan, and Tim Binder, director of animal husbandry who reported to Davis, resigned from the aquarium Thursday.

The third official, Mike Hurst, vice president of plant engineering and operations, lost his job in a reorganization, aquarium spokesman Dave Santucci said.

"Mike's position as we looked at it had a redundancy and it was no longer needed," Santucci said.

He declined to say why the three men no longer were with the attraction, and said the aquarium "will be actively searching for replacements" for Davis and Binder.

"These guys made very significant contributions to the aquarium, but they have decided to move on," Santucci said of the pair.

Tim Mullican will act as the supervisor of husbandry until the positions are filled, Santucci said.

Davis joined the aquarium in 2003. Binder came to the attraction in 2004, and Hurst, in 2005.

Swanagan left the aquarium in June to become executive director of the Columbus Zoo and Aquarium. Mike Leven, vice chairman of the Marcus Foundation and a member of the aquarium board of directors, replaced Swanagan as acting chief executive officer.