There's this reservoir near my house. It's stocked with fish and the fish are breeding. Everywhere you look, there's fish. It's packed! And the fish are jumping too. HUGE bigmouths.
The problem is that no matter what bait I use, I never catch any. I never even get bites unless it's from fry too small to even catch on a hook. I've used worms, top water lures, bottom and mid-level lures, poppers, rattles, spinners, fake frogs, lizards, etc., soft lures, attractants and scents, homemade bait balls, live worms, live insects... I've used just about everything except for live fish and other live animals. If it's not an insect or annelid (worm, leech), I don't want to stick a hook through it. Personal preferences...
I have to fish from the bank, I don't have a boat. But I try at the mouth of inlets, around weeds, deep water, shallow water, under logs, under docked boats, out in the open, off a dock... I have a lot of time obviously. I also try at different times of day... at different times of year. I'm in Maryland if that helps.