Comfort is the second most important fish priority. Each fish species has its own comfort zone, preferring certain bottom types, water temperatures, light conditions, depths and cover areas. Clean hard bottom with firm sand, rock, gravel and weedbeds are generally characteristic of good fishing habitat, while areas of mud and silt are often barren and should be avoided. Fish often avoid sunlight, so spend your time looking for deep, dark water during the bright calm days then the sun's rays penetrate deep; or look for shaded areas of weeds, submerged stumps, timber, sunken logs and docks. Light penetration varies with wind effect, sky conditions and water clarity; so don't waste time in water that contains too much light! As a rule . . . fish inhabit areas just below the sun penetration point!