Location
Groningen, The Netherlands
Event Website
http://fishpassage.umass.edu/
Start Date
23-6-2015 2:15 PM
End Date
23-6-2015 2:30 PM
Description
Abstract:
Man-made physical barriers (weirs) have disrupted longitudinal connectivity in many river systems around the world for centuries. Impacts of weirs on fish communities centers on the reduced ability of fish to perform upstream migrations. To counter the potential effects these structures are having on fish communities, a number of fish pass designs have been developed to ease passage around potential barriers. To monitor the effectiveness of a recently constructed nature like bypass on the River Aire, Passive Integrated Transponder (PIT) systems were installed to observe movements of brown trout (Salmo trutta). The array consists of four swim through antennas, two at either end of the pass so that swimming direction could be determined. A total of 111 wild brown trout were caught, PIT tagged and released 380 m downstream of the fish pass entrance. In total 57 brown trout (51%) were detected on the most downstream loop, and of these 49 successfully entered the pass (86%). Thirtyeight of these successfully exited the pass in an upstream direction (78%). Further analysis found that a select number of fish used the pass as an area of refuge during high flows. The possible reasons for these findings are discussed in relation to flow, temperature, time of day, season and fish size. This information is important to improve our understanding of fish pass performance, thus informing future best practice guidance of fish passage designs.
Session B5: Efficiency of a Nature-Like Bypass Channel at Rodley Weir, River Aire
Groningen, The Netherlands
Abstract:
Man-made physical barriers (weirs) have disrupted longitudinal connectivity in many river systems around the world for centuries. Impacts of weirs on fish communities centers on the reduced ability of fish to perform upstream migrations. To counter the potential effects these structures are having on fish communities, a number of fish pass designs have been developed to ease passage around potential barriers. To monitor the effectiveness of a recently constructed nature like bypass on the River Aire, Passive Integrated Transponder (PIT) systems were installed to observe movements of brown trout (Salmo trutta). The array consists of four swim through antennas, two at either end of the pass so that swimming direction could be determined. A total of 111 wild brown trout were caught, PIT tagged and released 380 m downstream of the fish pass entrance. In total 57 brown trout (51%) were detected on the most downstream loop, and of these 49 successfully entered the pass (86%). Thirtyeight of these successfully exited the pass in an upstream direction (78%). Further analysis found that a select number of fish used the pass as an area of refuge during high flows. The possible reasons for these findings are discussed in relation to flow, temperature, time of day, season and fish size. This information is important to improve our understanding of fish pass performance, thus informing future best practice guidance of fish passage designs.
https://scholarworks.umass.edu/fishpassage_conference/2015/June23/13
Comments
Presenting Author Bio: Jamie Dodd has always had a passion with water and spent many of his younger years fishing at his local beach. In 2010 he undertook his BSc in Marine and Freshwater biology at Hull University. Jamie is currently a second year PhD student at the Hull International Fisheries Institute (HIFI). In his PhD Jamie is looking into the potential impact of man-made structures on the migrational movements of both anadromous and potamodromous salmonids. His work focuses on efficiency results and the micro scale behaviours of fish in and around fish passes.