In November 2021, the temporary installation of the NEPTUN system was implemented at the bottom outlet of the dam reservoir on Lake Gelmersee in Switzerland. One of the main objectives of the project was to retain fish in the reservoir while it was being emptied of water. As a result of the implementation, the client received the intended results and the system achieved an efficiency of 94.2% retaining fish in the reservoir. The project carried out in collaboration with our partner I AM HYDRO.