View of the fish monitoring chamber (L. Schiefelbein)

In reference to previous information about the fish pass, we would like to present the current results that we managed to obtain thanks to the work of the biometric fish monitoring station.

As a reminder to analyze the phenomenon of fish migration and species identification, a Biometric Fish Monitoring Station was installed at the upper station, in the first chamber. Monitoring the movement of aquatic organisms in the fish pass is based on the HSMR hydroacoustic system. It uses two detection methods: hydroacoustic based on hydroacoustic transducers and optical method based on optical cameras.

We currently have prepared video monitoring data for the period from June 2020 to November 2023. During this period, the system generated approximately 560,000 detections of objects moving up or down the river, of which over 19,000 were fish detections. After rejecting the detection of "turning" and repeating fish, the total number of moving fish was 9,664. The monitoring recorded 15 species of fish and one species of lamprey.

At the same time, not only salmonids migrate through the fish pass; numerous cases of otters, beavers and cormorants passing through the fish pass have been recorded. The construction of the fish ladder enabled the migration of salmonids to their natural spawning places up the Łupawa River after the damming in Smołdzino was opened. This is only the first obstacle on the Łupawa River, but it brings the intended effect in the form of natural spawning of sea trout and salmon. The data obtained show that new fish species appear every year. Hence, the appearance of additional species and an increase in the number of fish observed are likely.

Below we present the latest detection compilation: