Hydropower plants, especially small hydro, are one of the main causes for the increasingly long Red Lists of fishes. If the expansion is not stopped, 186 fish species in the rivers of the Mediterranean region will be pushed further towards extinction. © Amel Emric

Hydropower plants are one of the main causes for the decline of numerous fish species in the Mediterranean region. This is the result of a new study. In total, 251 endangered freshwater fish species along with their stock situation in rivers in the Mediterranean basin were recorded. The impact of existing and planned hydropower plants on these populations was also evaluated.