And she assumed the unofficial title of world’s oldest aquarium fish in 2017 when Granddad, ... Bowhead whales, rougheye rockfish and some giant tortoises can live for roughly 200 years, ...

With proper care, a betta fish can live up to 3–5 years. 2. Discus Fish Known as the "king of the aquarium," discus fish are admired for their round shape and vibrant colours.