The Bílovka River case study: the ecotoxicology component of stream reclamation.

The Bílovka River is one of the most extensively drained rivers in the Odra catchment. The problem of the naturalization of the downstream part of the river is complicated by enormous pollution of surface water. The investment into the catchment requires a complex approach to provide successful ecological conditions in the reclaimed part of the river. The treatment must resolve the problems, not just reduce their influences. An ecological study of such a treatment must consider ecotoxicological effects as well. The results of an ecotoxicological evaluation of the catchment are demonstrated and discussed. These results contribute to the final goal of the ecological study: to prepare conditions for regeneration of the catchment in terms of primary needs for stable ecological conditions near the mouth of the river.