Migration ecology in the freshwater eels of the genus Anguilla Schrank, 1798

Arai, Takaomi

doi:10.1007/s42965-021-00217-7

Cited by 8 publications

(11 citation statements)

References 127 publications

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“…The wide range of otolith Sr:Ca ratios found in Anguilla bicolor bicolor indicated that the tropical catadromous eel had more elastic habitat use, similar to that of other temperate catadromous eels from European, American, Japanese and Australasian ( A. australis and A. dieffenbachii ) eels [ 6 , 10 , 30 ]. Landlocked or freshwater resident populations that do not have the oceanic life frequently exist in anadromous salmon, specifically around the southern boundary of their geographical distribution [ 31 ].…”

Section: Discussionmentioning

confidence: 87%

Contribution of migratory types to the reproduction of migrating silver eels in a tropical eel, Anguilla bicolor bicolor

Arai

Chino

2022

Heliyon

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Section: Discussionmentioning

confidence: 87%

Contribution of migratory types to the reproduction of migrating silver eels in a tropical eel, Anguilla bicolor bicolor

Arai

Chino

2022

Heliyon

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“…There is little information available on the life history of A . marmorata throughout the geographical distribution range, although the species is a geographically widespread species in the Indo-Pacific [ 7 , 8 , 74 ]. Information on the reproduction and migration ecology of A. marmorata is still unknown [ 75 ], and only one spawning site has been discovered in the North Equatorial Current (NEC) west of the Mariana Islands in the northwest area of the Pacific ( Figure 1 ) [ 50 ].…”

Section: Discussionmentioning

confidence: 99%

“…Similar to other anguillid eels, this tropical species spawns in the ocean. These larvae are then transported by oceanic currents during the larval stage, before experiencing a distinct metamorphosis into glass eels before recruitment to coastal waters [ 1 , 7 ]. The oceanic life characteristics such as the larval (leptocephalus) phase and metamorphosis timing together with oceanic current systems would determine the biogeographical distribution of anguillid eels.…”

Section: Introductionmentioning

confidence: 99%

“…In the anguillid eels of the genus Anguilla , otolith Sr:Ca can reconstruct the life history, migratory history and habitat use throughout their lives [ 7 , 8 , 11 ]. The application of otolith Sr:Ca ratios to reconstruct the migratory history has revealed a diverse migration strategy in various species such as A. anguilla [ 15 , 16 ], A. japonica [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ], A. rostrata [ 25 , 26 ], A. australis schmidtii and A. dieffenbachii [ 27 ], A. marmorata [ 28 , 29 , 30 , 31 , 32 ], A. bicolor bicolor [ 14 , 33 , 34 , 35 ] and A. bicolor pacifica [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

“…Metamorphosis is apparently completed before the maximal peak of otolith incremental width. Hence, otolith Sr:Ca ratios are believed to be a powerful tool for reconstructing the life history characteristics in the eels [ 7 , 38 ].…”

Section: Introductionmentioning

confidence: 99%

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Early Life History and Recruitment Processes of a Tropical Anguillid Eel Anguilla marmorata to the Pacific Coast, as Revealed by Otolith Sr:Ca Ratios and Microstructure

Arai

2022

Biology

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Recent progress in otolith microchemistry especially in strontium:calcium (Sr:Ca) ratios has revealed significant features of life histories in fishes. A catadromous eel, Anguilla marmorata, has the widest distribution among anguillid eels throughout the Indo-Pacific region. However, its dispersal and recruitment mechanisms in the ocean are still unknown. The temporal and spatial variations of early life history characteristics in a tropical anguillid eel A. marmorata were examined by means of otolith Sr:Ca ratios and microstructure to understand the larval transport and recruitment processes to the coasts in the Pacific region. Durations of the larval stage and age at recruitment to the southern part of Japan ranged from 79 to 157 d and 113 to 192, respectively. No significant differences were found between recruitment months in those parameters. The early life characteristics such as larval duration and age at recruitment were constant throughout the recruitment period in the southern part of Japan. The early life history characteristics in combination with the oceanic current regime possibly determine the larval transportation and dispersion processes and further recruitment dynamics to the Pacific coast of A. marmorata. The present study also provides useful information on its biogeographic distribution in the species as determined by otolith Sr:Ca ratios and microstructure.

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Variability in the duration and timing of the estuarine to freshwater transition of critically endangered European eel Anguilla anguilla

Boardman,

Pinder,

Piper

et al. 2023

Aquat Sci

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The European eel (Anguilla anguilla L.) is a critically endangered catadromous fish. Their inshore and in-river arrival as glass eel and elvers is an important stage of their life cycle, marking the transition from marine to freshwater habitats. Considerable knowledge gaps remain on the temporal and spatial patterns of this transition period to freshwater residency. Stable isotope (SI) analysis (δ13C, δ15N) was used to assess the timing and duration of the marine to freshwater transition among glass eels and elvers migrating upstream of the weirs at, or just upstream of, the tidal limit of four English rivers. (Parrett, Frome, Piddle, Chelmer). Variability in SI was low in the Parrett and Frome, resulting in narrow isotopic niches, but was high in the Piddle and Chelmer, resulting in wider niches. The Parrett and Frome data were then used to train a discriminant function analysis (DFA) model to classify eels as ‘marine’, ‘freshwater-established’ and ‘transitioning’. When applied to the Piddle and Chelmer eel SI data, only a small proportion of eels were classified as marine and transitioning, with most being freshwater established. These results suggest that most eels present in the lower reaches rivers have been present for sufficient time for their SI values to represent feeding on local prey resources, with relatively few eels being newly arrived from the marine environment. The transition of eels from marine to freshwater in this species can therefore be prolonged, with many ascending rivers at least one winter after their initial arrival.

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Migration ecology in the freshwater eels of the genus Anguilla Schrank, 1798

Cited by 8 publications

References 127 publications

Contribution of migratory types to the reproduction of migrating silver eels in a tropical eel, Anguilla bicolor bicolor

Contribution of migratory types to the reproduction of migrating silver eels in a tropical eel, Anguilla bicolor bicolor

Early Life History and Recruitment Processes of a Tropical Anguillid Eel Anguilla marmorata to the Pacific Coast, as Revealed by Otolith Sr:Ca Ratios and Microstructure

Variability in the duration and timing of the estuarine to freshwater transition of critically endangered European eel Anguilla anguilla

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