Here’s my two cents. I have noticed catching gills in the morning and evening normal. When the sun get up high and gets hot the fishin slow down. What I have been told is that fish don’t have eyelids, with the direct sun light in to the water will drive the fish deeper in to darker water, under docks and into shaded areas. I have notice this also in fishin for trout, shallow in the morning and evening deep during the day.