Answer from previous page. The type of fish located down stream are carp, bass, catfish which can tolerate less oxygen and higher temperatures.

Within fresh waters organisms are not evenly distributed. Different zones support different communities. In standing water, such as a lake, there are three commonly recognized zones. The first is the litterol, an area of shallow regions usually near the shore where light penetrates to the bottom. The second is limnetic, areas of open water to the depth where there is still sufficient light for the rate of photosynthesis to equal the rate of respiration. The final is produndal, bottom and deep water below the level of effective rate of light penetration. In shallow ponds the produndal zone may be absent. In moving water the principle zones are rapids and pools.

Aquatic life is probably most prolific in the litterol zone of the lake. Within this zone, the plant communities form concentric rings around the pond or lake as the depth increases. At the shore proper are cat tails, bull rushes, arrowheads, and pickeral weeds, the emeragent firmly rooted vegetation linking water and land environments. Out slightly deeper are the rooted plants with floating leaves such as water lilies. Still deeper are the fragile thin-stemmed weeds, rooted but totally submerged. Here are found diatoms, blue-green algae and green algae. Common green pond scum is a type of green algae.