Variations in the population dynamics of the European eel <i>Anguilla anguilla</i> (L.) along the course of a Cantabrian river

Lobón‐Cerviá, Javier; Utrilla, C. G.; Rincón, Pedro A.

doi:10.1111/j.1600-0633.1995.tb00023.x

Cited by 53 publications

(66 citation statements)

References 37 publications

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“…But the low efficiency of the ladder and reduced size of the active fraction could also be explained by a part of the STST glass eels switching directly to the benthic phase, and hence a longer active migration. The short duration of the active phase would be in line with the short distance covered by glass eels upstream from the tidal limit in freshwater streams (MORIARTY, 1986;NAISMITH and KNIGHTS, 1988;DUTIL et al, 1989, LOBÓN-CERVIÁ et al, 1995. However, other authors (JESSOP, 2000, DUTIL et al, 1989 describe longer migration up to 6-8+ weeks in some rivers, the distance covered reflecting the difficulty of upstream migration due to stream conditions.…”

Section: Fishery and Ladder Efficiencymentioning

confidence: 93%

“…The active phase probably has a short duration, illustrated by very few glass eels encountered in inland waters. Indeed, glass eels are observed on dams at the tidal head of estuaries (GASCUEL, 1986;McGOVERN and McCARTHY, 1992) but are rarely seen far upstream from the tidal limit in freshwater streams (MORIARTY, 1986;NAISMITH and KNIGHTS, 1988;DUTIL et al, 1989;LOBÓN-CERVIÁ et al, 1995;JESSOP, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…This process consists of low migration rates (MORIARTY, 1986;LOBÓN-CERVIÁ et al, 1995;WHITE and KNIGHTS, 1997;IBBOTSON et al, 2002). The active phase probably has a short duration, illustrated by very few glass eels encountered in inland waters.…”

Section: Introductionmentioning

confidence: 99%

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Estimating the Stock of Glass Eels in an Estuary by Mark-Recapture Experiments Using Vital Dyes

Briand¹,

Fatin²,

Feunteun³

et al. 2005

Bull. Fr. Pêche Piscic.

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Glass eels (Anguilla anguilla) arriving after the fishing season in the Vilaine estuary (France) were caught by boat and at a trapping ladder located at a blocking dam upstream in the estuary. They were marked with Bismarck brown, rhodamine B or neutral red, and released into the estuary. The effect of marking on behaviour, mortality and recapture differed according to the dye and concentration used. The glass eels also differed in response to marking according to their origin. Estuarine glass eels were clearly desynchronized in their selective tidal stream transport and left the release area after a few tidal cycles. Trapped glass eels were less sensitive to marking. They remained in the release area and were recaptured in larger number both in the trapping ladder and in the estuary. These results supported a model of two behavioral fractions in the estuary: flow-carried migrants and active glass eels with stronger rheotactic behaviour. The proportion of active glass eels in the estuary shifted from none for the two weeks after the fishery closure, to 10% value of the total stock. At the trapping ladder, the migration ended in June each year, while a large stock was still present in the estuary. These observations favour the interpretation of a short duration of the active phase at this site followed by the transition towards a more benthic behavior. The daily efficiency of the trapping ladder was calculated as 4% of the active stock from both stock estimations and average recapture rate. This value was consistent with the low annual efficiency of the trapping ladder, calculated as 30% of the estuarine stock of glass eels that arrived after the fishing season. Key-words:Anguilla anguilla, vital dye, glass eel, marking recapture. ESTIMATION DE STOCK DE CIVELLES EN ESTUAIRE PAR MARQUAGE-RECAPTURES À L'AIDE DE COLORANTS VITAUX RÉSUMÉLes civelles (Anguilla anguilla) arrivant après la fin de la saison de pêche dans l'estuaire de la Vilaine (France) ont été capturées à l'aide d'un bateau de pêche et sur une passe piège située à l'amont de l'estuaire sur le barrage qui limite la progression du stock migrant. Elles ont ensuite été marquées à l'aide de Brun-Bismarck, rhodamine B et rouge neutre et relâchées en estuaire. L'effet du marquage sur le comportement, la mortalité et les recaptures, a différé en fonction du colorant et de la concentration utilisés. Les civelles ont également montré une réponse différente au marquage en fonction de leur origine. Celles qui étaient prélevées en estuaire étaient clairement désynchronisées dans leur transport tidal sélectif et ont quitté la zone de lâché après quelques cycles de marées. Celles qui provenaient de la passe ont été moins sensibles au marquage. Elles sont restées dans la zone de lâché, et ont été recapturées en plus grand nombre à la fois dans la passe et dans l'estuaire. Ces résultats permettent de proposer un modèle ou deux fractions comportementales sont distinguées dans l'estuaire, des civelles en phase de migration portée et des civelles en migration acti...

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Section: Fishery and Ladder Efficiencymentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Estimating the Stock of Glass Eels in an Estuary by Mark-Recapture Experiments Using Vital Dyes

Briand¹,

Fatin²,

Feunteun³

et al. 2005

Bull. Fr. Pêche Piscic.

View full text Add to dashboard Cite

show abstract

“…Some studies use the absolute or relative density (e.g. Lobon-Cervia et al, 1995;Ibbotson et al, 2002;Laffaille et al, 2003;Imbert et al, 2008). The problem with this type of data is that the methods available do not allow reliable standardization of the data due to factors such as differing sampling efficiency in shallow versus deep habitats (Naismith and Knights, 1990;Jellyman and Graynoth, 2005).…”

Section: > Assessing Distribution Patterns With Logistic Modelsmentioning

confidence: 99%

Assessing the freshwater distribution of yellow eel

Lasne

Laffaille

2008

Knowl. Managt. Aquatic Ecosyst.

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In the global context of the decline in wild species, modeling the distribution of populations is a crucial aspect of ecological management. This can be a major challenge, especially for species, such as the European eel, that have complex life cycles, exhibit cryptic behavior, or migrate over long distances. A review of the literature suggests that eel size data could be used to assess and analyze freshwater distribution of eel. We argue that analyses based on small yellow eels (≤ 300 mm) along the longitudinal course of rivers could provide a valuable tool for population monitoring. We propose a standardized catchment recruitment index and a colonization index based on the probability of occurrence (presence/absence data) using logistic models for different size classes. The model developed here provides a convenient guide for assessing yellow eel stages in freshwater areas, and should have concrete applications for management of the species. RÉSUMÉ Évaluation de la distribution des anguilles jaunes en eau douceDans le contexte actuel de déclin des espèces, la modélisation de la distribution des populations est une étape importante pour la gestion de la biodiversité. Cependant, cette modélisation peut s'avérer difficile, particulièrement pour les espèces qui, comme l'anguille européenne, possèdent des cycles de vie complexes, ont un mode de vie cryptique ou effectuent de grandes migrations. Un examen de la littérature suggère que la taille des anguilles peut être utilisée comme critère pour évaluer et analyser la distribution des anguille en eau douce. Nous suggérons que l'examen des patrons de distribution des petites anguilles (≤ 300 mm) le long des réseaux hydrographiques peut fournir des informations précieuses pour le suivi des populations. Nous proposons un indice standardisé de recrutement et de colonisation des bassins versants sur la

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“…The main reason is that colonization is the result of changes in population pressure within a given site, a dynamic process, including immigration, emigration and growth, (LOBÓN-CERVIÁ et al, 1995;FEUNTEUN et al, 2003). To understand this dynamic, eel behaviour can be studied at the experimental level (KNIGHTS, 1987;GLOVA, 2001;GLOVA, 2002).…”

Section: Introductionmentioning

confidence: 99%

Effect of Re-Opening of a Migratory Pathway for Eel (Anguilla Anguilla, L.) at a Watershed Scale

Briand

Fatin

Fontenelle

et al. 2005

Bull. Fr. Pêche Piscic.

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The construction of the Arzal dam eel ladder in 1996 allowed enhancing fluvial recruitment from a negligible level, limited to yellow eels crossing sluice and dam overflow, to a level ranging from 0.2 to 2.4 million glass eels per year. The effect of such recruitment on the eel population (Anguilla anguilla) of the Vilaine watershed was analysed at 19 electrofishing sampling stations. From 1998 to 2003, average densities of eel varied from 0.34 to 0.72 eels.m -2 , with a maximum reached in 1999 of 0.82 eels.m -2 . Fluvial recruitment failure, together with density dependent mortalities, explains the drop in yellow eel densities observed from 1998 in the downstream area (< 50 rkm) and from 2000 in the middle stream area (50-100 rkm). The largest densities consisted of a large proportion eels classified as age 1 and the increased density in middle stream sectors was interpreted as the consequence of density-dependent migration at the periphery of a saturated area. The construction of 13 eel ladders on the Vilaine waterway in 1999 and 2000 was followed by increased densities in the upstream area (> 100 rkm) in 2001. The comparison to an electrofishing survey performed at 17 stations in 1981, ten years after dam construction, confirmed that ladder installation increased densities by a factor 6 and modified the population structure, with densities of eels age 0 and 1 multiplied 29 fold. This change corresponded to reduced escapement rates to the glass eel fishery (1% to 5%). Considering this result, a preliminary escapement target of 240 glass eel per km 2 of watershed area or 1 500 glass eel per ha of water surface, is proposed and discussed for glass eel fisheries.

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Variations in the population dynamics of the European eel Anguilla anguilla (L.) along the course of a Cantabrian river

Cited by 53 publications

References 37 publications

Estimating the Stock of Glass Eels in an Estuary by Mark-Recapture Experiments Using Vital Dyes

Estimating the Stock of Glass Eels in an Estuary by Mark-Recapture Experiments Using Vital Dyes

Assessing the freshwater distribution of yellow eel

Effect of Re-Opening of a Migratory Pathway for Eel (Anguilla Anguilla, L.) at a Watershed Scale

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