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