Whale sharks in the Dream Aquarium

The Whale shark (Rhincodon typus) is the largest filter-feeding shark, and the largest known extant fish species in the world. It is also the largest fish in the game. While it cannot be caught, if seen on the Submarine Tour at Pacar Beach, three will appear in the giant Temperate Aquarium. The Whale Shark Watcher achievement will also be earned. 
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