In the most recent year, a total of 247 fish were caught across the River Rhine and its tributaries, with June seeing the highest number of catches at 39. The largest fish recorded was a Zander, measuring an impressive 160 cm. In the Rhine, the Zander was the most frequently caught species, with 37 individuals. The Wiese saw the Alet as the most common, with 17 catches, while the Birs also had the Alet as the most frequently caught species, with 6 individuals. Compared to previous years, catches in the Rhine have decreased, while the Wiese and Birs have remained broadly stable.

Comparing the most recent year to previous years, the total number of fish caught has decreased from the 332 fish caught in 2020. The peak month for catches shifted from September in 2020 to June in 2021, indicating a change in seasonality. The species composition has also seen some shifts, with the Zander remaining dominant in the Rhine but with fewer catches than in previous years. The Alet continues to be prevalent in both the Wiese and Birs, maintaining its position as the most frequently caught species. Overall, the number of species recorded has remained consistent at 13, suggesting stability in species diversity despite the fluctuations in total catches.