Hand gernades. Just kidding. It's tough to catch them in mid-day unless they're on the nest or guarding the hatch. Always release those fish though. Use a green creme worm (rubber), no sinkers, and pitch it three or four feet from them. Let it sink on its own. Sometimes they'll take it on the way to the bottom but in mid-day they will often only follow it down at a safe distance. Let it settle on the bottom. They may turn away. No problem. Let it sit still. They'll almost always turn for a second look. Then give the worm a very slight twitch. Bango! About seventy percent of the time they'll nail it. In the evenings and mornings fast moving lures will work better.

Umbrella ,lemonaide and a nap

As others have said, mid day can be tough. At least where I am a lot of how tough it is has to do with the amount of cloud cover at mid-day, not just the time. On cloudy days I have smashed them all day before, but on a sunny or partly cloudy day it can be much tougher. When it gets tough I look for heavy cover/shade from overhangs and throw a Texas rigged worm weightless. A lot will depend on where you are as well. I am in Colorado, so with the colder water, sometimes mid day gets them hitting, instead of turning them off, at least until the middle of the summer.