The majority of Bavaria's watercourses are in poor ecological condition. A team has now conducted the first systematic analysis of long-term data on fish stocks in the Upper Danube, Elbe and Main rivers. The team concluded that native fish species are on the verge of extinction, while the populations of some invasive species are increasing.
from Latest Science News -- ScienceDaily https://ift.tt/2Iw4SJ8
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