General Answer for Sturgeons - Small sturgeon eat very small organisms & larvae. As they mature they will eat almost anything such as: decaying matter/fish, mollusks, crustaceans, shrimp, crayfish, snails, clams, muscles, insects, worms, eggs of other fish mainly salmon, worms, some aquatic plants. Small fish such as herring, smelt, sunfish, bass, trout & shad, but also salmon. They like squid and are known to eat mice, rats, & frogs.
Mainly dead or alive stuff that is on the bottom but they will pursue live fish and may even feed on the carcass of another sturgeon.
Hatchery sturgeon are usually fed specially formulated sinking pellets, but also squid & trout.