A favorite among park visitors, the Main Reef Aquarium features a 750,000-gallon saltwater aquarium teeming with reef fishes of every size, color and description. During the Reef Presentation, a diver accompanied by a group of Sea Trekers slowly work their way around the aquarium allowing visitors to watch as he/she hand-feeds the colorful tropical fish, large groupers, cobia, stingrays and moray eels. This presentation is accompanied by an informational narration.