Some of my best trips have been on the hottest days of the summer. Its weird, but the water was 14 ft deep and we caught them about 18 inches below the surface. We were fishing boat lanes in a marsh. I don't know if it was lack of oxygen or what, but it sure was fun. In 5 trips with either my wife or a couple of my boys with me, we caught over 400 that we took home.
Here is pics from a couple of trips. They aren't real big, but lots of them.