I have not really put a standard on these yet as I am too new at fishing for Sturgeon. I just go where I have had luck so far and keep doing what worked before. When it stops working, I need to try something else. I have used a depth gauge to find the holes, no fish finder. So it is kind of a shot in the dark as to whether there are fish in the area or not.
However, I did just buy a fish finder...so now I would guess I will not be able to catch them at all.
My logic tells me that the outgoing tide would continue to bring bait down river with the current, yet on the other hand, I think the incoming tide brings bait up and entices them. But, I have caught them at all times of the day and get bites at all times...so I cannot really make any sense out of it.
I just catch 'em, take a photo and let 'em go.