Sturgeon are, for all purposes of this thread, like giant catfish. If it is on the bottom of the river and it smells good, they'll eat it.
Now that I have a job again, I'm going to see if I can't pick up some scrap pieces of halibut, salmon, rockfish, cod, sablefish, sole, etc and see how they produce...
But if you've seen some of the stuff sturgeon have tried to eat, you'll see anything can work - like leftover gummy worms (seriously!)