Integration of Constructed Floodplain Ponds into Nature-Like Fish Passes Supports Fish Diversity in a Heavily Modified Water Body

Fish passes facilitate fish movement in fragmented river systems, yet they can also provide important habitat functions. This study investigated the community composition of different constructed types (fluvial habitats, floodplain ponds) within relation to characteristics order deduce recommendations for fish-friendly designs such structures. structures differed significantly from those main river, comprising a high number rheophilic species fluvial habitats (Thymallus thymallus, Hucho hucho, Salmo trutta, Cottus gobio, Chondrostoma nasus, and Barbus barbus), stagnophilic ponds (Rhodeus amarus, Scardinius erythrophthalmus, Misgurnus bipartitus, Tinca tinca). During summer, provided juvenile target C. nasus B. barbus. Differences between two abundance were mostly explained by differences macrophyte coverage, gravel, boulders, temperature, current speed. The findings this stress functions passes. They suggest that integration diverse structures, especially currently hardly considered into passes, greatly enhance their communities contribute restoration several declining conservation.