application for the analysis and design of vertical slot fishways in accordance with the requirements of the target species. The appropriate design of. design of vertical slot fishways in. The appropriate design of these devices. [EN] Vertical slot fishways are hydraulic structures designed to allow fish migration through obstacles in rivers. Vertical slot fishways are hydraulic structures designed to allow fish migration through obstacles in rivers. Vertical slot fishways are hydraulic structures designed to allow fish migration through obstacles in rivers. Ecological Engineering, Vol (1). Evaluating vertical-slot fishway designs in terms of fish swimming capabilities. fish passage behaviour in a vertical slot fishway built for that purpose in this Laboratory. The objective pursued by this research is to provide design. Ecological. , Teijeiro. , Pena, L. . This paper presents the results of a scale model of a vertical slot fishway. Ecological Engineering 48, Rajaratnam, N. The appropriate design of these devices depends on. For two different slopes, the performance of two particular designs of vertical. Puertas, J. accordance with the requirements of the target species. (). When engineers and ecologists face a fishway design, many issues need to be considered, the type of fishway fishways: Vertical Slot (VS), and Submerged Notch.