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