Joint EIFAAC/ICES/GFCM Working Group on Eels

Amilhat, Elsa; Bajinskis, Janis; Beaulaton, Laurent; Belpaire, Claude; Bernotas, Priit; Boulenger, Clarisse; Brämick, Uwe; Briand, Cedric; Bryhn, Andreas C.; Christoffersen, Mads; Ciccotti, Eleonora; Dekker, W.; Díaz, Estibaliz; Domingos, Isabel; Drouineau, Hilaire; Durif, Caroline; Evans, Donald M.; Freese, Marko; Godfrey, Jason D.; Gollock, Matthew; Hammen, T. van der; Hanel, Reinhold; Jakubowski, Lucjusz; Leone, Chiara; Lozys, Linas; Marohn, Lasse; Martinez, Inigo; Nermer, Tomasz; O’Leary, Ciara; Özdilek, Şükran Yalçın; Pedersen, Michael Ingemann; Pohlmann, Jan‐Dag; Poole, Russell; Rosell, Robert; Sapoundis, Argyris; Sims, Kenneth Patrick; Sundin, Josefin; Stundye, Rimantè; Švagždys, Arvydas; Taylor., A. J.; Thorstad, Eva B.; Tutiņš, Rūdolfs; Vesala, Sami; Walker, Alan; Wariaghli, Fatima; Wickström, Håkan; Wysujack, Klaus

doi:10.17895/ices.pub.5982

Cited by 8 publications

(4 citation statements)

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“…Eels were most abundant in the smaller estuaries of the Wimereux and the Liane. CPUE values for the eels were in range with the highest densities reported in the ICES WGEEL database for larger rivers of Great Britain, France and Spain in the Interreg Atlantic and North Sea areas [60]. This suggests that small estuaries can support large eel populations.…”

Section: Discussionmentioning

confidence: 56%

“…Several causes have been suggested to explain the decline in eel stocks, including habitat loss and dams that reduce accessibility to growth habitats, pathogens and pollution [76,[90][91][92][93]. The presence of barriers to migration and alteration of water quality and their habitats have been suggested as the main causes which have led to their decline [60,[94][95][96]. The six estuaries studied in the present study are less affected by anthropogenic pressures and considered to be of good chemical status and medium ecological status, except for the Somme estuary, which is rated as poor.…”

Section: Discussionmentioning

confidence: 99%

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Abundance and Growth of the European Eels (Anguilla anguilla Linnaeus, 1758) in Small Estuarine Habitats from the Eastern English Channel

Denis

Mahé

Amara

2022

Fishes

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Abundance and growth of the European eel from six small northern French estuaries during their growth phase were examined to explore variations according to the local habitat characteristics. The length–weight relationships and growth models fitted to length-at-age back-calculated otolith growth increments were used to compare the growth. Higher abundances were observed in the smaller estuaries (2.4 to 10.5 ind. fyke nets 24 h−1). The eel length ranged from 215–924 mm with an age range of 4–21 years. There was no significant difference in fish eel lengths or age except in the Liane estuary where the individuals were larger. The length–weight relationships showed an isometric or positive allometric growth in most estuaries. The Gompertz growth models, which best fits the growth, showed no significant differences between estuaries except for female eels from the Liane and the Somme estuaries where the growth performance index was higher. The estimated annual growth rate varied from 2.7 to 115.0 mm·yr−1 for female and from 4.4 to 90.5 mm·yr−1 for male. The present study shows that eels in the six estuaries had CPUE and growth rates similar to those previously reported in larger habitats. These results reinforce the idea that small estuaries are important habitats that contribute significantly to the eel population and, therefore, play an essential role in conservation strategies for European eel.

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Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 99%

Abundance and Growth of the European Eels (Anguilla anguilla Linnaeus, 1758) in Small Estuarine Habitats from the Eastern English Channel

Denis

Mahé

Amara

2022

Fishes

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“…Eels in the yellow stage feed and grow until they mature into the silver stage before migrating to the spawning grounds to reproduce. European eel populations have declined in recent decades due to a sharp decline in glass eel recruitment in the early 1980s [3][4][5]. Eel populations were affected by many factors (e.g., habitat degradation, overfishing, pollution, and migration barriers) [6] that act synergistically, especially during the continental growth phase [7].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Natural and Anthropogenic Environmental Pressures on European Eel Abundances in French Estuaries

Denis,

Lepage,

Gruselle

et al. 2024

Fishes

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The aim of this study was to investigate the influence of environmental characteristics and anthropogenic pressures on the abundance of estuarine European eels (Anguilla anguilla L.) during their continental growth phase. European eels were collected with fyke nets from spring to autumn in twenty-nine estuaries along the French English Channel and the Atlantic coast. Eel abundance (catch per unit effort, CPUE) was assessed for all eels and by size class for small (total length < 300 mm), intermediate (≥300 to <450 mm), and large (≥450 mm) eels. The environmental characteristics of the French estuaries were described by twelve descriptor variables, mainly related to hydro-morphological and sedimentary factors. Based on principal component analysis and hierarchical clustering analysis, estuary size was identified as the main explanatory variable and used to compare eel abundance. Eel abundance differed significantly according to estuary size, with higher abundances observed in small estuaries (7.22 to 13.00 ind. fyke nets 24 h−1) compared to large estuaries (0.13 to 0.71 ind. fyke nets 24 h−1). Spatial variation in eel abundance was correlated with differences in estuary size for all eel size classes. The influence of anthropogenic pressures on eel abundance was assessed by nine anthropogenic estuarine pressure indicators. The results indicate that high values of the anthropogenic pressure indicators were correlated with low eel abundance. This study highlights that large French estuaries subject to stronger anthropogenic pressures were less favourable habitats than small estuaries with less anthropogenic pressure.

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“…The European eel Anguilla anguilla stock has declined by about 90% since the 1950s ( Dekker, 2019 ); since 2011, however, recruitment of juvenile eels has levelled off ( ICES, 2020 ). The life cycle of European eel includes different life stages, often related to the long migrations between the Atlantic spawning area in the Sargasso Sea and the coastal and freshwater habitats ranging from North Africa to the Barents Sea ( Tesch, 2003 ).…”

Section: Introductionmentioning

confidence: 99%

Meta-analyses of molecular seafood studies identify the global distribution of legal and illegal trade in CITES-regulated European eels

Nijman

Stein

2022

Current Research in Food Science

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Authentication of seafood products by means of molecular techniques has relevance for food sustainability and security, as well as international trade regulation, linked to transparency in food manufacturing. We focus on the molecular detection of the depleted European eel Anguilla anguilla , a species for which strict international trade regulations are in place since 2010, in studies conducted outside Europe. We found thirteen studies from nine countries (Canada, China, Japan, Malaysia, Peru, Singapore, South Korea, Taiwan, and USA) for which, on average, 59 ± 28% of the 330 sequenced eel samples comprised European eel. Only China, Japan, South Korea, and USA reported the import of European eel in the years prior to sampling. The authentication of eel products demonstrates a global, in part illegal, trade in European eel, covered up by incomplete or fraudulent labelling. This calls into question the compliance with existing national and international trade regulations and its implications for food safety and sustainability.

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Joint EIFAAC/ICES/GFCM Working Group on Eels

Cited by 8 publications

References 0 publications

Abundance and Growth of the European Eels (Anguilla anguilla Linnaeus, 1758) in Small Estuarine Habitats from the Eastern English Channel

Abundance and Growth of the European Eels (Anguilla anguilla Linnaeus, 1758) in Small Estuarine Habitats from the Eastern English Channel

The Influence of Natural and Anthropogenic Environmental Pressures on European Eel Abundances in French Estuaries

Meta-analyses of molecular seafood studies identify the global distribution of legal and illegal trade in CITES-regulated European eels

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