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