In this study the newly developed fishway "Fischliftschleuse" (fish lift lock) has been examined in terms of their functionality regarding discovery and accessability by fish. Model systems of the prototype were built at the barrage weirs of two power plant sites at the rivers Löllingbach and Gurk in Carinthia. The University of Natural Resources and Life Sciences in Vienna was commissioned by developer Dipl.-Ing. Bernhard Monai to carry out the fish ecological monitoring as part of a feasibility study at the fishways in spring and summer 2015. To estimate the migration potential a stock assessment was carried out at the site Lölling Bach. The typical leading and accompanying fish species represented at the trial sites were used for the study of fish ecological continuity of the facilities. After the fish population survey by electrofishing, fish have been marked according to their origin and were transferred together into the bottom water. The ascending experiments at the two locations were carried out each in a preliminary test, with caging of the fish by shutting off the underwater side migration and a main experiment without barrier. The documented fish in the fish trap of the upper water could be assigned of their origin after the ascent. The operational safety of the system with regard to the transport of the fish was reviewed by video documentation and later on evaluated. As part of the feasibility study on the Fischliftschleuse it has been proved that the fishway is discoverable and passable for brown trout and bullhead. A rise of grayling has not been demonstrated. The newly developed system is a space-saving solution for the restoration of the ecological continuity for fish at impassable sites.