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Impact of Tide Gates on the Migration of Adult European Eels, Anguilla anguilla

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Abstract

Tide gates form a temporal barrier to fish migration, closing during the flood tide and opening during the ebb, primarily for flood prevention and land reclamation. Their impact on downstream adult migration of the critically endangered European eel, Anguilla anguilla, is unknown. The River Stiffkey, UK, has three top-hung tide gates (one counterbalanced, two not) through which it discharges into the North Sea. Adult eels of silver appearance (n = 118) were caught between 0.5 and 6.0 km upstream from the tide gates in Autumn 2011 and implanted with 23 mm half-duplex passive integrated transponder (PIT) tags. Tagged individuals were detected by PIT antennae located near the tide gates. Of the eels tagged, 80 were detected actively migrating downstream to the gates. Escapement past the gates was 98.3 %. Speed of migration was slower near the gates than for an unimpeded upstream reach and was positively and negatively related to mean degree of gate opening and mean light intensity, respectively. When the largest gate was modified through installation of an orifice intended to improve upstream passage of sea trout and juvenile eels, downstream migration was more rapid when it was operating. However, video analysis revealed that eels did not pass through the orifice, meaning that faster migration may have been a result of the gates being open on more occasions when eels initially approached them, or the lower tides and upstream saline intrusion that occurred during these periods. Top-hung tide gates in the River Stiffkey delayed eel migration, potentially increasing the risk of predation and energy expenditure immediately prior to a 5000–6000 km migration to spawning grounds in the Sargasso Sea.

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Acknowledgments

This project was funded by the University of Southampton, the Environment Agency and the Interreg IVB Living North Sea Project. The authors thank Cefas, Wild Trout Trust, Buxton Conservation, Holkham Estate and Fishing Syndicate, Hull International Fisheries Institute, Aquatic Control Engineering, Norfolk EA Fisheries Team, Lady Kay Buxton, Rosie Edgington, Tom Harrison, Sam Sykes, Peter Carter, Simon Karlsson, Tom Worthington, Adam Piper, Peter Marchant, Ben Kerley, Josh Nightingale, Emma Dyson, Freddie Wells, Ralph Wright, Silvana Wright, Toby Diggens, Lee Corsi and Nick Stokes.

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  1. International Centre for Ecohydraulics Research, Faculty of Engineering and the Environment, University of Southampton, Highfield, Southampton, SO17 1BJ, UK

    G. V. Wright & P. S. Kemp

  2. Environment Agency, Rivers House, Threshelfords Business Park, Inworth Rd, Feering, CO5 9SE, UK

    R. M. Wright

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Wright, G.V., Wright, R.M. & Kemp, P.S. Impact of Tide Gates on the Migration of Adult European Eels, Anguilla anguilla . Estuaries and Coasts 38, 2031–2043 (2015). https://doi.org/10.1007/s12237-014-9931-1

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