The freshwater drum prefers clear water, but it is tolerant of turbid and murky water. This impacted the Don with increased pollution, heavy flooding, and turbid sediment laden waters. The white sucker is also relatively tolerant of turbid and polluted waters. Sunfish species are especially intolerant to turbid waters. They are commonly found in turbid waters rich in plankton. Similarly, in darkly stained or turbid waters, walleyes tend to feed throughout the day. This is easier in dimly-lit or turbid seawater than in good illumination. In deep or turbid water processes, sorption and biodegradation take place. In some cases, markings may be absent altogether, especially in fish from turbid waters. Areas of high productivity tend to be somewhat turbid from plankton blooms. These small solid particles cause the liquid to appear turbid. Skipjack shad are found in clear to moderately turbid water in areas with flow. It is not used in turbid waters with poor visibility. Since they congregate in turbid waters, little is known about their reproductive behavior. The solution was unusually (low viscosity), turbid, stir-opalescent and buttermilk in appearance.