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4. Beluga Sturgeon
The beluga sturgeon isn’t just any fish—it’s the producer of the world’s most expensive caviar, which can cost an unbelievable $4,500 per pound! Unfortunately, their value has made them a target for overfishing, pushing them to the critically endangered list. But what’s truly remarkable about this species is its lifespan. These fish can live for 188 years, meaning one could have been swimming around since the 1800s!