Question

what is the oldest fish in the world​

Answer 1

Answer:

Greenland shark

As for the current holder of the record for oldest fish in the sea, it's the Greenland shark. A 2016 study examining these cold-water sharks' eyes found one female estimated to be nearly 400 years old—good enough to hold the record for the oldest known vertebrate not just under the sea but anywhere on the planet.

Explanation:

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Answer 2

Granddad, an Australian Lungfish at the Shedd Aquarium in Chicago, died at the age of 95, making him the oldest aquarium fish in the world. The Shedd Aquarium received Granddad and other native fishes in 1933 from the Taronga Zoo in Sydney Australia.