Do sharks eat sturgeon

Sturgeons are not a natural prey of sharks, for two main reasons:

a) The sturgeon is a salt and fresh water bony fish (it is considered a «living fossil»).

Pups and youngsters live mostly in cold water rivers until maturity, where the bull shark is absent (beeing the most common fresh water shark predator, it lives in warm waters, avoiding the very cold to temperate waters that are the usual habitat of the sturgeon).

b) A few (not all!) sturgeon species may migrate to coastal northern Atlantic Ocean, in North America, in high latitude Europe and Asia, when they reach maturity.

At that point, adult sturgeons are too large to be an easy prey of any shark, and larger species (like the Beluga Sturgeon) can reach a total lenght of 5 metres, or even larger.