This video from Australia says about itself:
Shows fish going up a fish ladder (or fishway) on Wolli Creek in inner south-west Sydney. The fishladder was constructed in early 2009, ending a situation where, for decades, it was almost impossible for native fish to navigate between the salt and fresh sections of the creek. An example of a simple device making a big difference to a degraded ecosystem.
Translated from the Waterschap Roer en Overmaas in Limburg province, the Netherlands:
Wednesday, June 6, 2012 9:04 p.m.
Roermond – For the third consecutive year the fish ladder in Roermond near the ECI plant in the river Roer turns out to be very successful. Recent monitoring data from Roer and Overmaas show this. In 2011, no less than 16,764 passing fish were counted, of 39 species. The most common fish in the Roer in Roermond were…
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