The project deals with the Rudava stream, at the site of the existing river stage (rm 28,500), the construction of a transverse structure of the whole-point roughened slip – biocorridor, which will enable aquatic animals to overcome the existing barrier and thus ensure the improvement of biodiversity to flow. Solution section Rudavy belongs to the wet fish zone Place of construction – Bratislavský kraj, okres Malacky, the village of Plavecký Mikuláš. The location of the site is given by the existing trough of the flow of Rudavy. So 01 Preparation of the area – removal of stands and removal of deposits, including purification of the trough in the fish duct site, construction of temporary water transfer during construction, establishment of fishovodu.SO 02 fish-water – the beginning of the fish duct will be under the existing broth degree and the end of the fish duct will be in the place of the overflow threshold of the existing degree. The length of the fish duct is 82.90 m. The type of fish duct is a pass-through. The pass-through slip will be built as a roughened bouldering slip. On the slip surface, protruding boulders shall be placed chess in order to form shelters and a water surface between the boulders to allow the movement of aquatic animals upstream of the water flow along the slide surface. All construction works during the rebuilding of the stage will be carried out in the existing river bed Rudava in the area of the river stage, in the region of Bratislava, district Malacky, village Plavecký Mikuláš. After the implementation of the biocorridor, there will be a continuous section of 35,300 km on the river Rudava. The project also includes the performance of bioecological supervision, which will carry out supervision in particular in the field of compliance with approved design conditions during construction, if necessary cooperate on the design of solutions to unpredictable situations in construction, draw up evaluation reports for the main building supervision of the building, competent authorities of nature protection and water protection, after completion of the construction work to check compliance with the required parameters of the trough and flow characteristics, deduct compliance with environmental requirements and prepare a final assessment of the compliance of the fish duct with the Methodological Guideline of the Ministry of the Environment “Determination of suitable types of fish pipes according to the type of water bodies”.