If they made it, I should be finding small shiners, maybe 2-3 inch range ? I did put some adults in last summer, so those will be larger. If I was to bet on it, I'd be betting I won't find many shiners at all, small or large. As far as method, I'm planning on using a net.
I determine the condition of my forage base not only with pellet feeding but also by employing a dozen minnow traps set along the edges of my pond. I bait them with bread or pellets - but they will capture plenty of forage without any bait also. I routinely sample various sizes of tadpoles, FHM and GSH - the latter up to 4 - 5", and if I'm lucky I'll even score a crawfish or some PK Shrimp. This is an easy and immediate way to determine the condition of your forage base if you lack a seine and a buddy to help you [like me].
Couple of tips for using minnow traps: Keep them in 1-2' of water, resist the urge to go deeper, IMO catches are exponentially smaller. Also, don't allow them to sit for several days - 24-48 hrs max or many of your precious critters will die. It's interesting to note my tadpoles begin consuming the minnow casualties and there are several half eaten if I leave the trap for longer than 48 hrs. Definitely on the tadpoles menu!