This brings us to the topic of current and structure. The vast majority of instructional fishing articles immediately identify their targeted species at the onset, but in the case of river fishing, classic-river structure often contains a wealth of species. The best rivers offer a mix of fast-water rapids, pools, eddies, bends, aquatic weeds, rocks, sand, gravel, mud, emerged timber, and an inlet or two. And the best of the best put this combination within a range that can be covered inside a couple of hours. Pools, eddies, and any slack water are the first places to look for upon entering the water.
Slack water is the product of numerous catalysts.
In fact, moving water striking an object such as a rock actually forces water to curl back, or back draw, behind the rock. The larger the boulder, typically, the bigger the fish using it as refuge. Huge rocks or the combination of several boulders in sequence might house a school of fish. Another thing to consider about rock structure is that some boulders do not break the surface. Boils and mysteriously back curling water generally reveal the presence of large underwater rocks.