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