At the site of the existing weir on the Myjava stream(rkm 23,800), the project solves the construction of a chamber fish duct – a biocorridor, in order to improve biodiversity to flow. The designed section of Myjavy belongs to the wet fish zone. Place of construction – Trnavský kraj, okres Senica, village Šajdíkové Humence. The location of the site is given by the existing Myjava trough or its left bank. The building consists of the following building objects: SO-01 Preparation of the area – removal of stands, felling of shrubs, trees and removal of stumps and grasslands. Existing deposits in the Myjava river basin will be removed from the space of the projected fish duct. The construction of a temporary table pen combined with bagging in the inlet and outlet points of the fish duct. So – 02 fish-water – the beginning of the fish duct will be at the end of the existing weir broth and the end of the fish duct will be above the existing hatch or above the left-shore fortification above the hate. The length of the fish duct is 50,53 m. The type of fish duct is a chamber. Water abstraction into the fish duct will be from the airy level of the existing weir. In the transverse profile the fishwater will represent the “U” profile of the sv. width 2000 mm, divided into individual units with partitions. The bottom of the chambers will be fortified with stone paving into concrete. The guide pipe length 44.95 m will serve for “sliming of fish” in the locality at the entrance to the fish duct. In order to maintain the fish duct, i.e. cleaning the chambers of the fish duct from deposits and repairing damaged pavements and fish duct partitions, the inlet to the fish duct and the effluent from the fish duct will build a verdant from oak planks mounted in guide rails from “U” profiles. On the outer retaining wall of the fish duct will be placed tubular railings height of 1.10 m. There is a devastated pavement on the right bank under the hait will be removed and a stone tile will be established.The project also solves the delivery and installation of equipment to measure the height of the levels in the biocorridor. Measurable indicators: Number of measures to ensure the coherence of watercourses and remove barriers in watercourses – 1. The length of the continuous section of the watercourse after the elimination of the barrier – 26,500 km.The project also includes the performance of bioecological supervision, which will carry out supervision especially in the field of compliance with approved design conditions during construction, cooperate if necessary in the management of unforeseen situations in construction, draw up evaluation reports, 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 Environment of the Slovak Republic “Determination of suitable types of fish ducts according to the typology of water bodies”.