Hello, I'm an expert in marine biology with a focus on the study of aquatic life. When it comes to the largest fish species in the world, the title goes to the
whale shark (*Rhincodon typus*). The whale shark is not only the largest fish but also the largest known extant fish species. They can grow up to 40 feet (12 meters) in length and weigh as much as 20 tons (18,000 kilograms). These gentle giants are filter feeders, primarily consuming plankton, small fish, and krill.
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