Reaction of silver eels to artificial light sources and water currents: An experimental deflection study

Hadderingh, R. H.; Aerssen, G.H.F.M. van; Beijer, R.F.L.J. De; Velde, G. van der

doi:10.1002/(sici)1099-1646(199907/08)15:4<365::aid-rrr552>3.0.co;2-k

Cited by 36 publications

(25 citation statements)

References 9 publications

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“…Our model showed that migration peaked during the waning moon in Grand Lieu Lake, confirming a classical observation of light avoidance (Hadderingh, Van Aerssen, De Beijer, & Van der Velde, 1999;Lowe, 1952;Pankhurst & Lythgoe, 1983). Our model showed that migration peaked during the waning moon in Grand Lieu Lake, confirming a classical observation of light avoidance (Hadderingh, Van Aerssen, De Beijer, & Van der Velde, 1999;Lowe, 1952;Pankhurst & Lythgoe, 1983).…”

Section: Factors Triggering and Guiding Silver Eel Migrationsupporting

confidence: 84%

Migration behaviour and escapement of European silver eels from a large lake and wetland system subject to water level management (Grand‐Lieu Lake, France): New insights from regulated acoustic telemetry data

Trancart

Feunteun

Danet

et al. 2017

Ecology of Freshwater Fish

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Current knowledge about the downstream migration of sexually mature European eels (Anguilla anguilla) remains incomplete, particularly in still water habitats such as lakes and wetlands subject to water level management. However, for the management of this endangered species, it is important to understand migration dynamics, and contribution to the breeding stock. This study aimed to assess the parameters that trigger and guide the migration of silver eels in the largest floodplain lake and associated wetlands in France (the sluice regulated Grand-Lieu Lake). A telemetry survey of 50 acoustic and PIT-tagged female silver eels was performed during the 2015-2016 migration period. We deployed a novel telemetric approach, using receivers to delimit several restricted virtual boxes to determine the instantaneous location of individuals and to transform simple discrete telemetric data into presence/absence data. The low numbers leaving the lake centre are probably explained by the lack of orienting water flows or other environmental clues, but whilst the fate of 34% (17/50) of the tagged eels is unknown, 18% (9/50) were caught by commercial fishermen. Modelling showed that detections were not clearly associated with environmental factors typically involved in riverine migrations (e.g. current velocity, atmospheric pressure and temperature) but they were particularly associated with higher and increasing water levels and, for eels exiting the lake, a sharp increase when sluice gates were opened to an effective gap of >75 cm. It is concluded that management of water levels and sluice gate opening during the migration period might aid escapement of silver eels.

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Section: Factors Triggering and Guiding Silver Eel Migrationsupporting

confidence: 84%

Migration behaviour and escapement of European silver eels from a large lake and wetland system subject to water level management (Grand‐Lieu Lake, France): New insights from regulated acoustic telemetry data

Trancart

Feunteun

Danet

et al. 2017

Ecology of Freshwater Fish

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“…Damage to downstream migrant silver eel passing through turbines at hydroelectric facilities can be high and is mostly due to mechanically-caused injuries because of their elongated morphology (Monten, 1985;EPRI, 2001;Larinier and Travade, 2002;Travade and Larinier, 2006). Various types of physical screening and also behavioural barriers based on light, sound and electricity have been tested, but none of them has proved both biologically effective and economically acceptable (Hadderingh and Baker, 1998;Hadderingh et al, 1999;Sand et al, 2000;EPRI, 2001;Amaral et al, 2003;Boubée and Williams, 2006). In order to develop effective technologies, particularly improvement in trashrack design criteria, we need to understand better the downstream migration of the eel and its behavioural response at hydroelectric water intakes.…”

Section: Introductionmentioning

confidence: 64%

Behaviour and passage of European silver eels (Anguilla anguilla) at a small hydropower plant during their downstream migration

Travade

Larinier

Subra

et al. 2010

Knowl. Managt. Aquatic Ecosyst.

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Key-words:silver eel, downstream migration, behaviour, hydroelectric plant, trashracks, radio-tracking Between 2004 and 2007, 116 downstream migrant silver eels (Anguilla anguilla) were monitored at a hydropower plant on the Gave de Pau river in South-West France using radio and PIT telemetry. The objectives of the study were: (i) to determine the environmental conditions when eels arrived and passed the facility; (ii) to determine the rate of eel escapement (passage other than via the turbines); (iii) to describe the behaviour of eels faced with the intake structure and the permeability of the intake trashracks for the different sizes of eel; and (iv) to determine whether surface bypasses originally designed for salmon could be effective for eels. Five types of behaviour of silver eels in the forebay and at the plant intakes were identified. The study showed the key factor influencing both eel behaviour and the route taken through the plant was variation in river discharge. Escapement rate was related to eel length and the spill flow to river flow ratio, which could be described by a logistic regression model. The surface bypasses originally designed for salmon were found to aid downstream eel migration significantly. At velocities < 0.40 m·s −1 , no eels, even the largest, for which the racks are a physical barrier, were found impinged on the trashracks.

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“…This tendency to not swim along the coastline may be the first step in their navigation towards the open ocean and hence to the spawning areas in the Sargasso Sea. In experiments, A. anguilla silver eels have been found to prefer swimming routes with the highest water velocity (Hadderingh et al , 1999). In the current study, however, there is no information available about the differences in the current speeds across the fjord.…”

Section: Discussionmentioning

confidence: 99%

Early marine migration of European silver eel Anguilla anguilla in northern Norway

Davidsen

Finstad

Økland

et al. 2011

Journal of Fish Biology

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25To study migratory behaviour in wild northern European silver eel (Anguilla anguilla) during 26 sea entry and early marine migration, 32 individuals were tagged with acoustic transmitters 27 and registered at four automatic listening station arrays from the mouth of the north 28Norwegian River Alta and throughout the Alta Fjord. The A. anguilla entered the fjord during 29 all parts of the tidal cycle and did not seem to utilize the outgoing tidal currents. They 30 migrated mainly during the night, both in the river mouth and fjord. On average, they spent 31 2.7 days travelling from the river mouth to the outermost array, 31 km from the river mouth, 32 corresponding to anaverage migratory speed of 0.

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Reaction of silver eels to artificial light sources and water currents: An experimental deflection study

Cited by 36 publications

References 9 publications

Migration behaviour and escapement of European silver eels from a large lake and wetland system subject to water level management (Grand‐Lieu Lake, France): New insights from regulated acoustic telemetry data

Migration behaviour and escapement of European silver eels from a large lake and wetland system subject to water level management (Grand‐Lieu Lake, France): New insights from regulated acoustic telemetry data

Behaviour and passage of European silver eels (Anguilla anguilla) at a small hydropower plant during their downstream migration

Early marine migration of European silver eel Anguilla anguilla in northern Norway

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