Freshwater and coastal migration patterns in the silver‐stage eel Anguilla anguilla

Abstract

(2016) 'Freshwater and coastal migration patterns in the silver-stage eel Anguilla anguilla.', Journal of sh biology., 88 (2). pp. 676-689. Further information on publisher's website:http://dx.doi.org/10.1111/jfb.12865 Publisher's copyright statement: This is the accepted version of the following article: Barry, J., Newton, M., Dodd, J. A., Lucas, M. C., Boylan, P. and Adams, C. E. (2016), Freshwater and coastal migration patterns in the silver-stage eel Anguilla anguilla. Journal of Fish Biology, 88(2): 676-689, which has been published in nal form at http://dx.doi.org/10.1111/jfb.12865. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

Direct and indirect impacts of pumping station operation on downstream migration of critically endangered European eel

“…The low detection rate (40%) may be attributed to unfound receivers causing gaps in the line but the detection rate was similar to the 26% estuarine survival rate reported by Barry et al. (), and thus undetected eels may have been predated upon (see Amilhat et al., ). The eels that moved through the line of receivers in coastal waters did so on an ebbing tide, suggesting eels were migrating using selective tidal stream transport, as reported by McCleave and Arnold ().…”

“…A large proportion of acoustic-tagged eels released downstream of the pumping station quickly completed the first phase of the marine migration, but no eels entrained in the small axial flow pump were detected at the mouth of the estuary or in coastal waters. The low detection rate (40%) may be attributed to unfound receivers causing gaps in the line but the detection rate was similar to the 26% estuarine survival rate reported by Barry et al (2015), and thus undetected eels may have been predated upon (see Amilhat et al, 2016). The eels that moved through the line of receivers in coastal waters did so on an ebbing tide, suggesting eels were migrating using selective tidal stream transport, as reported by McCleave and Arnold (1999).…”

Timing and pattern of annual silver eel migration in two European watersheds are determined by similar cues

“…A positive relationship between water level and the number of migrating silver eels is a common observation (Deelder, ; Frost, ; Haro, ; Trancart, Acou, De Oliveira, & Feunteun, ). Migrating with high waters is interpreted partly as an antipredator behavior, but it is also energetically beneficial to migrate at higher water levels when water velocity is higher (Barry et al., ).…”

Migration pathways, speed and mortality of Atlantic salmon (Salmo salar) smolts in a Scottish river and the near‐shore coastal marine environment

“…Nocturnal migration is thought to be a common predator avoidance strategy in outward migrating Atlantic salmon Thorstad, Whoriskey, et al, 2012) and European eel (Anguilla anguilla; Durif & Ellie, 2008;Barry et al, 2015), with movement on darker nights potentially hindering predator success (Barry et al, 2015;Thorstad, Whoriskey, et al, 2012;Urke et al, 2013). Nocturnal migration is thought to be a common predator avoidance strategy in outward migrating Atlantic salmon Thorstad, Whoriskey, et al, 2012) and European eel (Anguilla anguilla; Durif & Ellie, 2008;Barry et al, 2015), with movement on darker nights potentially hindering predator success (Barry et al, 2015;Thorstad, Whoriskey, et al, 2012;Urke et al, 2013).…”

“…Migration success was linked to the lunar brightness, and entry into the marine environment occurred primarily at night. Nocturnal migration is thought to be a common predator avoidance strategy in outward migrating Atlantic salmon Thorstad, Whoriskey, et al, 2012) and European eel (Anguilla anguilla; Durif & Ellie, 2008;Barry et al, 2015), with movement on darker nights potentially hindering predator success (Barry et al, 2015;Thorstad, Whoriskey, et al, 2012;Urke et al, 2013). Some studies investigating early marine migration in Atlantic salmon have reported a less defined diel migration, with some suggesting a complete switch to more active swimming during the day (Dempson et al, 2011;Hedger et al, 2008;Koed et al, 2006).…”