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  • 1
    Online Resource
    Online Resource
    Tracking anguillid eels: five decades of telemetry-based research
    CSIRO Publishing ; 2018
    In:  Marine and Freshwater Research Vol. 69, No. 2 ( 2018), p. 199-
    Details
    In: Marine and Freshwater Research, CSIRO Publishing, Vol. 69, No. 2 ( 2018), p. 199-
    Abstract: Advances in telemetry technologies have provided new opportunities to reveal the often-cryptic spatial ecology of anguillid eels. Herein we review 105 studies published between 1972 and 2016 that used a variety of telemetry technologies to study the movements of eels in a variety of habitats. Eight anguillid species have been tracked in three main geographical locations: Western Europe, the north-eastern part of North America and Australasia. Telemetry has proven to be an effective method for determining patterns of yellow eel movements in continental waters. It has also been used extensively to investigate the migratory behaviour of maturing eels as they leave fresh water to reach the sea. Among recent findings is the observation that downstream migration in continental waters is quite discontinuous, characterised by extended stopovers. Reconstructed migration routes in the open ocean obtained from satellite tags have provided indications of spawning areas, extensive vertical migrations and initial clues about the orientation mechanisms at sea. Telemetry studies have also revealed apparent evidence of predation by marine mammals and fish at sea, suggesting a significant natural source of mortality during the eel spawning migration. Finally, we discuss some limitations of telemetry technology and future directions, as well as associated challenges, to the developing field of eel spatial ecology.
    Type of Medium: Online Resource
    ISSN: 1323-1650
    URL: Article
    DOI: 10.1071/MF17137
    Language: English
    Publisher: CSIRO Publishing
    Publication Date: 2018
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    SSG: 21,3
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  • 2
    Online Resource
    Online Resource
    The migration of stocked, trapped and transported, and wild female American silver eels through the Gulf of St. Lawrence
    Canadian Science Publishing ; 2018
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 75, No. 11 ( 2018-11), p. 2024-2037
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 75, No. 11 ( 2018-11), p. 2024-2037
    Abstract: The stocking of juvenile eels and trap and transport programs of large yellow (American) eels (Anguilla rostrata) were initiated in Ontario to mitigate mortalities observed at hydroelectric dams and to increase escapement from the upper St. Lawrence River and Lake Ontario (Canada). A total of 380 migrating female silver eels (stocked, trapped and transported, and wild) were tagged with acoustic transmitters between 2011 and 2014. Their migration and escapement at the exit of the Gulf of St. Lawrence, the Cabot Strait, were recorded using acoustic receivers. Escapement rates varied between 8.9% and 20.0% annually (mean = 11.4%). A high proportion of stocked eels were detected (N = 27 of 43 detected at Cabot Strait), demonstrating their ability to escape the Gulf. No differences in migration speed or crossing locations at Cabot Strait were found among the three categories. Eels crossing Cabot Strait did not display diel and tidal patterns, but their estimated swimming depth indicated diel vertical migrations. The low escapement rates observed may be related to predation events and (or) the low and variable detection efficiency of the acoustic receivers’ line.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/cjfas-2017-0356
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2018
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    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
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  • 3
    Online Resource
    Online Resource
    Large‐scale, seasonal habitat use and movements of yellow American eels in the St. Lawrence River revealed by acoustic telemetry
    Wiley ; 2015
    In:  Ecology of Freshwater Fish Vol. 24, No. 1 ( 2015-01), p. 99-111
    Details
    In: Ecology of Freshwater Fish, Wiley, Vol. 24, No. 1 ( 2015-01), p. 99-111
    Abstract: Large‐scale habitat use and movements of yellow American eels ( Anguilla rostrata ) from the St. Lawrence River were examined using acoustic telemetry from early summer to late fall in 2010 and 2011. Sixty‐seven eels were tagged, and their passage or presence was recorded using fixed acoustic arrays covering a 400 km distance along the St. Lawrence River and Estuary. Sixty‐four per cent of the 67 tagged eels were detected. Most eels were detected at only one array; the closest to their release location and at several occasions during the tracking period, suggesting a high proportion of freshwater residency in the upstream part of the St. Lawrence River. Downstream movements towards the brackish estuary (63–418 km distance) were demonstrated for 16.4% of the eels, particularly for those caught at the most downstream site that is close to the brackish estuary. Our results strongly suggest a lower activity of freshwater resident yellow eels during summer, a behaviour that may be related to day length, which defines time available for their nocturnal foraging. Indeed, yellow eels were detected primarily at night; no effect of moon phase was revealed. Movements in the vicinity of arrays (up to 116 km in the fluvial estuary) were suggested and smaller‐scale movements within Lac St. Louis were demonstrated, highlighting a yellow‐eel home range far more extensive than previously reported in smaller systems. Evidence for within‐season homing and site fidelity is also reported.
    Type of Medium: Online Resource
    ISSN: 0906-6691 , 1600-0633
    URL: Issue
    URL: Article
    DOI: 10.1111/eff.2014.24.issue-1
    DOI: 10.1111/eff.12129
    Language: English
    Publisher: Wiley
    Publication Date: 2015
    detail.hit.zdb_id: 2028166-3
    SSG: 21,3
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  • 4
    Online Resource
    Online Resource
    Shark Predation on Migrating Adult American Eels (Anguilla rostrata) in the Gulf of St. Lawrence
    Public Library of Science (PLoS) ; 2012
    In:  PLoS ONE Vol. 7, No. 10 ( 2012-10-17), p. e46830-
    Details
    In: PLoS ONE, Public Library of Science (PLoS), Vol. 7, No. 10 ( 2012-10-17), p. e46830-
    Type of Medium: Online Resource
    ISSN: 1932-6203
    URL: Article
    URL: Article
    URL: Article
    DOI: 10.1371/journal.pone.0046830
    DOI: 10.1371/journal.pone.0046830.s001
    DOI: 10.1371/journal.pone.0046830.s002
    Language: English
    Publisher: Public Library of Science (PLoS)
    Publication Date: 2012
    detail.hit.zdb_id: 2267670-3
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  • 5
    Online Resource
    Online Resource
    Large-scale migration patterns of silver American eels from the St. Lawrence River to the Gulf of St. Lawrence using acoustic telemetry
    Canadian Science Publishing ; 2014
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 71, No. 10 ( 2014-10), p. 1579-1592
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 71, No. 10 ( 2014-10), p. 1579-1592
    Abstract: Downstream migration of silver American eels (Anguilla rostrata) from the St. Lawrence system was examined using acoustic telemetry. One hundred and thirty six silver American eels were tagged, and their passage was recorded using fixed acoustic arrays covering a 420 km distance along the St. Lawrence River and Estuary. Eighty-nine percent of the tagged eels were detected. All migrant eels (111) exhibited unidirectional and downstream movements, but the migration was not completed in one continuous direct movement. High individual variability in migratory longitudinal profiles was documented as well as in individual speed with no apparent relation to river discharge or morphological traits. Migration speed increased over the season. Our observations demonstrated that migrating silver American eels are largely nocturnal and demonstrated the use of nocturnal, ebb tide transport to leave the estuary. With 44 additional eels tagged and released in the maritime estuary, escapement of 180 silver American eels from the Gulf of St. Lawrence system was monitored along a 125 km acoustic line that entirely covered Cabot Strait in 2011. Surprisingly, only four of the tagged eels were recorded escaping the Gulf of St. Lawrence.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/cjfas-2013-0217
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2014
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    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
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  • 6
    Online Resource
    Online Resource
    Exploring the role of the physical marine environment in silver eel migrations using a biophysical particle tracking model
    Oxford University Press (OUP) ; 2016
    In:  ICES Journal of Marine Science Vol. 73, No. 1 ( 2016-01-01), p. 57-74
    Details
    In: ICES Journal of Marine Science, Oxford University Press (OUP), Vol. 73, No. 1 ( 2016-01-01), p. 57-74
    Abstract: Both the American eel (Anguilla rostrata) and European eel (Anguilla anguilla) undertake long-distance migrations from continental waters to their spawning sites in the Sargasso Sea. Their migration routes and orientation mechanisms remain a mystery. A biophysical particle tracking model was used in this study to simulate their oceanic migration from two release areas: off the Scotian Shelf (Canada) and off the Irish continental shelf. Two plausible swimming-directed behaviours were considered for simulating two different migratory paths: true navigation to specific spawning sites and innate compass orientation towards the vast spawning area. Several combinations of swimming speeds and depths were tested to assess the effect of ocean circulation on resulting migratory pathways of virtual eels (v-eels), environmental conditions experienced along their oceanic migration, and energy consumption. Simulations show that the spawning area can be reached in time by constantly swimming and following a readjusted heading (true navigation) or a constant heading (compass orientation) even at the lowest swimming speed tested (0.2 m s−1) for most v-eels. True navigation might not be necessary to reach the spawning area. The ocean currents affect mainly the migration of American v-eels, particularly for swimming speeds lower than 0.8 m s−1. The ocean circulation increases the variability in the oceanic migration and generally reduces the efficiency of the v-eels, although positive effects can be possible for certain individuals. The depth range of diel vertical migration (DVM) significantly affects the total energy expenditure due to the water temperature experienced at the various depths. Model results also suggest that energy would not be a limiting factor as v-eels constantly swimming at 0.8 BL s−1 spent & lt;25 and 42% of energy available for migration for American and European v-eels, respectively.
    Type of Medium: Online Resource
    ISSN: 1095-9289 , 1054-3139
    URL: Article
    DOI: 10.1093/icesjms/fsv169
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2016
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  • 7
    Online Resource
    Online Resource
    Direct observations of American eels migrating across the continental shelf to the Sargasso Sea
    Springer Science and Business Media LLC ; 2015
    In:  Nature Communications Vol. 6, No. 1 ( 2015-10-27)
    Details
    In: Nature Communications, Springer Science and Business Media LLC, Vol. 6, No. 1 ( 2015-10-27)
    Abstract: Since inferring spawning areas from larval distributions in the Sargasso Sea a century ago, the oceanic migration of adult American eels has remained a mystery. No adult eel has ever been observed migrating in the open ocean or in the spawning area. Here, we track movements of maturing eels equipped with pop-up satellite archival tags from the Scotian Shelf (Canada) into the open ocean, with one individual migrating 2,400 km to the northern limit of the spawning site in the Sargasso Sea. The reconstructed routes suggest a migration in two phases: one over the continental shelf and along its edge in shallow waters; the second in deeper waters straight south towards the spawning area. This study is the first direct evidence of adult Anguilla migrating to the Sargasso Sea and represents an important step forward in the understanding of routes and migratory cues.
    Type of Medium: Online Resource
    ISSN: 2041-1723
    URL: Article
    DOI: 10.1038/ncomms9705
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2015
    detail.hit.zdb_id: 2553671-0
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  • 8
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    Online Resource
    Using otolith microchemistry to reconstruct habitat use of A merican eels A nguilla rostrata in the S t. L awrence R iver– L ake O ntario system
    Wiley ; 2017
    In:  Ecology of Freshwater Fish Vol. 26, No. 1 ( 2017-01), p. 19-33
    Details
    In: Ecology of Freshwater Fish, Wiley, Vol. 26, No. 1 ( 2017-01), p. 19-33
    Abstract: Catadromy among freshwater eels is increasingly recognised as being facultative, with some individuals carrying out growth exclusively in brackish or coastal marine waters, or switching between brackish or marine waters and freshwater habitats. In an attempt to reconstruct habitat use of yellow‐stage American eels in a large river‐lake ecosystem, trace element line scans were obtained, using LA ‐ ICP ‐ MS , from the otoliths of 110 eels sampled at various locations throughout the St. Lawrence River–Lake Ontario ( SLRLO ) system. Elemental profiles for strontium (Sr), barium (Ba), manganese (Mn) and magnesium (Mg) enabled us to distinguish three chemical signatures that appear to represent three distinct habitats within the SLRLO . Of these, one was shown to likely correspond to the brackish estuary (high strontium values). The other two signatures, characterised by low strontium but variable concentrations of barium and manganese, may correspond to habitats within the main‐stem St. Lawrence River and one or more of its tributaries. Most (78%) of the switches among habitats occurred within the first four years after recruitment suggesting an increasing likelihood for eels to maintain residence in one habitat as they grow older. This suggests that tributaries may provide important habitats for American eels during the first several years after recruiting to the SLRLO . In addition, our results suggest that a small proportion American eels in the SLRLO can undertake movements on the order of at least 200 km during the early growth stage. This information has important implications for the management and conservation of this species in the system.
    Type of Medium: Online Resource
    ISSN: 0906-6691 , 1600-0633
    URL: Issue
    URL: Article
    DOI: 10.1111/eff.2017.26.issue-1
    DOI: 10.1111/eff.12246
    Language: English
    Publisher: Wiley
    Publication Date: 2017
    detail.hit.zdb_id: 2028166-3
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    SSG: 12
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