Zakoryazhennost - presence of the remains of woody vegetation on the bottom of a water body: stumps, submerged and silted tree trunks, snags, etc. Zakoryazhennost makes it difficult or impossible to exploit water bodies and worsens fish habitat conditions.

Fish ponds are cleaned to bring them to the cultural condition. Stumps, snags and trees that are firmly seated in the ground are pulled out with special pincers or a cable using a gate or a winch installed on a raft or on the shore. To remove large stumps and trees, tractor traction is used. When constructing ponds, serious attention should be paid to bed preparation - clearing of stumps, snags, bushes, filling of irregularities, holes, etc.