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 salmon relatives, bream, roach and eel. Thanks to the fish ladder the fish can pass the hydroelectric plant well to spawn upstream.
Since the construction of the fish ladder at the ECI in 2008, volunteers keep track day after day how many fish swim upstream and downstream. Particularly the salmonids thrive in the Roer. In 2011 especially Atlantic salmon, sea trout, brown trout, rainbow trout and Elsässer saibling were seen. Of the remaining species the roach, bream and eel were the most common.
Interestingly, three sea trout (48, 58, 60 cm) and two salmon (70, 95 cm) which had probably spawned, were caught. This may be the first signs of a more natural reproductive cycle of Atlantic salmon and sea trout in the Roer. Three fish species were caught in the trap which had not been observed previously, gibel carp, carp and wels catfish. The river lampreys are on the rise. In 2011, for the first time river lampreys were caught in the Roer river. In total 105 river lampreys were counted last year.
Spawning breams video: here.
Czechs fit eels with transmitters to monitor them: here.
- An afternoon on the Hampshire Wey (talesbytheriverbank.wordpress.com)
- Fred Mangels: Just install fish ladders (redding.com)
- Fish? On a Ladder??? (madebypatch.wordpress.com)
- Bull trout still struggle with Thompson Falls fish ladder (missoulian.com)
- Mazama Tribe Visits Alsea Fish Hatchery (peakadventureclub.org)
- Potential world record brown trout caught in New Zealand (jsonline.com)