Diel and seasonal movements of radio-tagged freshwater eels, Anguilla spp., in two New Zealand streams

Jellyman, D. J.; Sykes, J. R. E.

doi:10.1023/a:1023691604088

Cited by 65 publications

(31 citation statements)

References 46 publications

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confidence: 99%

“…Numerous telemetric studies have been carried out on the Atlantic eels A. anguilla and A. rostrata and the New Zealand eels Anguilla australis and Anguilla dieffenbachii. They have described the movements and time and space utilisation of eels in rivers (Jellyman & Sykes, 2003;Ovidio, Seredynski, Philippart, & Nzau Matondo, 2013) and estuarine habitats (Béguer-Pon et al, 2015;Hedger, Dodson, Hatin, Caron, & Fournier, 2010;Parker, 1995;Simpfendorfer, Olsen, Heupel, & Moland, 2012;Thibault, Dodson, & Caron, 2007;Walker, Godard, & Davison, 2014). These studies have shown that yellow eels are principally nocturnal (Hedger et al, 2010;Jellyman & Sykes, 2003;Walker et al, 2014) and have decreased activity during winter.…”

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confidence: 99%

“…They have described the movements and time and space utilisation of eels in rivers (Jellyman & Sykes, 2003;Ovidio, Seredynski, Philippart, & Nzau Matondo, 2013) and estuarine habitats (Béguer-Pon et al, 2015;Hedger, Dodson, Hatin, Caron, & Fournier, 2010;Parker, 1995;Simpfendorfer, Olsen, Heupel, & Moland, 2012;Thibault, Dodson, & Caron, 2007;Walker, Godard, & Davison, 2014). These studies have shown that yellow eels are principally nocturnal (Hedger et al, 2010;Jellyman & Sykes, 2003;Walker et al, 2014) and have decreased activity during winter. Furthermore, while most eels overwinter in the same habitat as the one they occupy at other times of the year (Ovidio et al, 2013), some move from brackish water estuaries to freshwater rivers to overwinter (Béguer-Pon et al, 2015;Hedger et al, 2010).…”

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Site fidelity, diel and seasonal activities of yellow‐phase Japanese eels (Anguilla japonica) in a freshwater habitat as inferred from acoustic telemetry

Itakura

Miyake

Kitagawa

et al. 2017

Ecology of Freshwater Fish

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Japanese eels (Anguilla japonica) perform large-scale oceanic migrations between their spawning ground and growth habitats in continental waters during life history.However, between these migrations, they spend most of time in growth habitats such as rivers. To investigate the diel and seasonal activities, homing behaviour and home range of yellow-phase Japanese eels in the lower reach of the Tone River, we tracked them throughout a year using a fine-scale positioning system (VPS) based on acoustic telemetry. The tracked eels were generally nocturnal, but not exclusively. They were mainly mobile from spring to autumn, with little or no activity observed during winter.A transport-release experiment showed that most eels returned to their original capture area within 13 days after release. The eels had very small home ranges (mean ± S D = 0.085 ± 0.068 km 2 ), core areas (0.014 ± 0.014 km 2 ) and linear home ranges (744 ± 268 m). They also tended to be distributed on one particular side of the river (right or left bank) and in one particular shore type (revetment or vegetation), rarely moving from one to the other. This study provides evidence for nocturnal, dormancy, homing behaviours, limited habitat use and small home range size in Japanese eels.The eels clearly showed strong fidelity to a "familiar" site, which contrasts with the long distances travelled during upstream and downstream migration phases in the river, and during spawning migrations in the ocean. K E Y W O R D Sacoustic telemetry, Anguilla japonica, dormancy, home range, homing behaviour, VR2WPositioning System

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Site fidelity, diel and seasonal activities of yellow‐phase Japanese eels (Anguilla japonica) in a freshwater habitat as inferred from acoustic telemetry

Itakura

Miyake

Kitagawa

et al. 2017

Ecology of Freshwater Fish

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“…Arai et al, 2004;Daverat et al, 2006), although such studies are unable to ascertain whether such movements are linked to seaward migration. Jellyman & Sykes (2003) similarly reported restricted home ranges (1-126 m, mean: 30 m) in A. australis in a small New Zealand stream, using radiotelemetry, although their study examined a small number of fish (n = 8) over a much more limited timescale (29-387 days, median: 88 days). Although tagged eels resident in the fjords suffered high rates of fishing-related mortality, three entered the sea at 29, 41 and 138 days post-tagging.…”

Section: Movement Patternsmentioning

confidence: 99%

“…Such findings are consistent with our observations of A. australis and raise the possibility that extended estuarine residence prior to seaward migration may be prevalent within other anguillid species. Lowe, 1952;Vøllestad et al, 1986;Jellyman & Sykes, 2003;Breukelaar et al, 2009). 5-day flow is log 10 -transformed.…”

Section: Movement Patternsmentioning

confidence: 99%

Environmental cues and extended estuarine residence in seaward migrating eels (Anguilla australis)

et al. 2014

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Summary Spawning migration by freshwater eels to their marine spawning grounds is widely considered to be direct and rapid; however, emerging evidence suggests that eel migratory behaviour is more complex than previously thought, with potential implications for eel conservation and management. Over a 5‐year period, we tagged 97 yellow‐phase short‐finned eels Anguilla australis with acoustic transmitters in the freshwater reaches of a south‐eastern Australian river to: (i) examine environmental correlates associated with seaward migration; (ii) test the hypothesis that migration is rapid and direct once initiated and (iii) assess individual variation in behaviour associated with seaward migration. Twenty‐three of the tagged eels migrated from fresh water into the estuary, whilst the remainder stayed within fresh water. Movement was detected primarily at night and eels entered the estuary throughout the year, with an increase in frequency over summer and following high river flows. Time in the estuary ranged from 1 to 305 days (median: 77 days). Movement into the sea was influenced primarily by the lunar phase, and to a lesser degree by water temperature, and occurred from late summer to early autumn. The extended residence and complex movements of migrating eels in the estuary suggest that they are considerably more vulnerable to exploitation than would be predicted by the generalised eel migration model of direct movement out to sea.

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Slippery customers for conservation: Distribution and decline of anguillid eels in South Africa

Hanzen

Lucas

Weyl

et al. 2022

Aquatic Conservation

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These catadromous fishes face multiple stressors, including habitat alteration and deterioration, barriers to migration, pollution and the adverse impacts of alien species, but knowledge of eel species occurrence, abundance and ecology in Africa remains poor.2. This study investigated the present and historical distribution of anguillid eels and the potential associated drivers of declines at the southern extremities of their ranges in South Africa. Data analysed included sampling conducted in KwaZulu-Natal and Eastern Cape between 2015 and 2020, and secondary data extracted from databases, museums and local management agencies.3. The median extent of inland penetration increased as follows: 22 km for A. bicolor, 29 km for A. marmorata, 94 km for A. bengalensis and 293 km for A. mossambica.

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Diel and seasonal movements of radio-tagged freshwater eels, Anguilla spp., in two New Zealand streams

Cited by 65 publications

References 46 publications

Site fidelity, diel and seasonal activities of yellow‐phase Japanese eels (Anguilla japonica) in a freshwater habitat as inferred from acoustic telemetry

Site fidelity, diel and seasonal activities of yellow‐phase Japanese eels (Anguilla japonica) in a freshwater habitat as inferred from acoustic telemetry

Environmental cues and extended estuarine residence in seaward migrating eels (Anguilla australis)

Slippery customers for conservation: Distribution and decline of anguillid eels in South Africa

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