Adam B.,Institute For Angewandte Okologie |
Faller M.,Aussenstelle Des Institute For Angewandte Okologie |
Gischkat S.,Aussenstelle Des Institute For Angewandte Okologie |
Hufgard H.,Aussenstelle Des Institute For Angewandte Okologie |
And 2 more authors.
WasserWirtschaft | Year: 2012
Since the new double slot pass has gone into operation at the Geesthacht dam, an extensive, long term fish-ecological monitoring has been accomplished, which includes the old bypass facility on the southern river bank. Daily counts show that the double slot pass is used by about eight times the number offish as that of the bypass. In addition, the range of species that use the double slot pass is higher than that of the bypass, with 43 and 37 species, respectively. The double slot pass is also used by fish species, which are typical of the River Elbe, such as zander and smelt, but do not appear or are underrepresented in the species range present in the bypass. By implementing transponder technology, important insights are gained into how the traceability of the two fish passes differs, the results often being highly dependent on the respective species. These findings demonstrate that some species prefer ascending the double slot pass, located on the point bank, whilst more powerful swimmers may choose to use the bypass on the cut bank.