Narrator: The original beluga imported in 2003 are known as brood stock. Zaslavsky: Look at this giant. Graham Flanagan: Oh, my God! It looks like a shark! Zaslavsky: This fish makes shark look small.

Viral sensations such as “Baby Shark” come and go ... His biggest hit, “Baby Beluga,” offers kids a blueprint for becoming an individual — swimming “so wild” and “so free ...