How to get 1000-year-old blue whales in the deep sea aquarium?

You need to collect all other inactive fish.

Blue whale:

The blue whale (scientific name: Balaenoptera musculus) is a marine mammal belonging to the suborder baleen whales. * * * There are four subspecies. The blue whale is considered to be the largest known animal on earth, with a body length of 33 meters and a weight of 18 1 ton. The blue whale has a slender body and a blue-gray back, but sometimes it looks lighter in water.

Like other baleen whales, blue whales mainly feed on small crustaceans (such as krill) and small fish, sometimes including squid. Usually, blue whales need to feed in the sea above 100 meters during the day, and they can only feed on the water at night. Blue whales begin mating in late autumn and continue until the end of winter. Female whales usually give birth every 2-3 years. After 10- 12 months of pregnancy, young whales are usually given birth in early winter. The four oceans are distributed.