Caracteristiques Biologiques Des Civelles (Anguilla Anguilla) Lors De La Transition en Estuaire.

Lecomte-Finiger, R.; Prouzet, Et P.

doi:10.1051/kmae:2003040

Cited by 11 publications

(6 citation statements)

References 27 publications

(20 reference statements)

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“…Results of Beaulaton & Castelnaud (2005) however, were applied to a very large and turbid estuary (Gironde River) and may not be valid in the Adour Estuary, where water transparency tends to be high and catches made at night. Water transparency and clear nights are negatively related to the abundance of catches in the Adour Estuary (de Casamajor et al , 2003), thus night movement might even be lower than expected. In addition, winter floods can create conditions with no flow reversal quite frequently in this small estuary, and such hydraulic blocking conditions may persist for as long as ≥2 weeks (de Casamajor et al , 2000).…”

Section: Discussionmentioning

confidence: 98%

Swimming activity and behaviour of European Anguilla anguilla glass eels in response to photoperiod and flow reversal and the role of energy status

Colombier

Bolliet

Bardonnet

2009

Journal of Fish Biology

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To better understand migratory divergences among Anguilla anguilla glass eels, the behaviour of individuals caught at the time of their estuary entrance was studied through their response to a light:dark cycle and then to both water current reversal and light:dark cycle. In a first experiment, fish moving with the flow in response to dusk (M(+) fish) and fish that had not exhibited any movement (M(-) fish) were distinguished. Anguilla anguilla from these two groups were then individually marked and their response to water current reversal compared. M(+) individuals mainly exhibited negative rheotaxis with a tidal periodicity, whereas positive rheotaxis was mainly exhibited by M(-) individuals. Thus, M(+)A. anguilla glass eels showing negative rheotaxis appear to have the strongest propensity to migrate, the converse applies to M(-) ones showing positive rheotaxis. A small percentage of individuals (5%) were hyperactive, alternately swimming with and against the current with almost no resting phase. These fish lost c. 2 mg wet mass day(-1), whereas individuals which were almost inactive lost c. 1 mg day(-1). Wet and dry mass changes in relation to activity levels were compared with previous experiments and it was concluded that A. anguilla glass eel energy status might be involved in differences in migratory tendencies but other factors that might be important are discussed. It is proposed that any decrease in A. anguilla glass eel energy stores associated with global warming might lead to an increase in the proportion of sedentary individuals and thus be involved in the decrease in the recruitment to freshwater habitats.

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Section: Discussionmentioning

confidence: 98%

Swimming activity and behaviour of European Anguilla anguilla glass eels in response to photoperiod and flow reversal and the role of energy status

Colombier

Bolliet

Bardonnet

2009

Journal of Fish Biology

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“…When glass eels arrive in estuaries, the majority are in the VA glass eel stage. In estuaries, they become pigmented and the VB glass eel stage dominates (De Casamajor et al, 2003;Lefebvre et al, 2003;Briand et al, 2005b), being about 70% in the Couesnon estuary. The mean individual size of glass eels caught in the Couesnon estuary (69 mm and 0.29 g) is similar to the size estimated in other French Atlantic estuaries (Desaunay and Guerault, 1997;Lambert et al, 2003) and elsewhere in Europe (Dekker et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

Temporal patterns in the upstream migration of European glass eels (Anguilla anguilla) at the Couesnon estuarine dam

Laffaille

Caraguel²,

Legault³

2007

Estuarine, Coastal and Shelf Science

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The temporal migration patterns of European glass eel Anguilla anguilla at the Couesnon estuarine dam (Mont-Saint-Michel Bay, France) were examined in winter and spring 2004 and 2005. The dam which is located close to the river mouth constitutes a major obstacle for upstreammigrating glass eels. The migration was observed at different temporal scales, from within individual tides to complete tidal cycles between successive spring tides. The maximum number of glass eels arrived downstream of the dam at the beginning and in the middle of the flood tide. Glass eels migrated through the dam openings preferentially from the middle of the flood to the beginning of the ebb tide. Eel densities were highest during the second tide of each tide cycle that arrived at the estuarine dam and when the difference in water level between upstream and downstream of the dam was greatest, particularly at the end of the flood. Analysis of the influence of each environmental factor provided a good prediction of the glass eel recruitment peaks and, therefore, of the most favourable temporal windows for their migration. The water level and temperature were the most important environmental factors. These results provide the information needed for a dam-management program that is compatible with glass eel migration.

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“…The glass eels of the fished batch were principally (94%) in the relatively late development stages VIA2 to VIA4 at the time of marking, compared with glass eels caught in nearby French estuaries (Elie & Rochard 1994;De Casamajor et al 2003;Laffaille et al 2007). The low body mass can be explained by their late development stages, as observed by Briand et al (2005) andDe Casamajor et al (2003), due to storage in fish seller's tank in fresh water for 8-15 days before marking and by the lack of feeding.…”

Section: Discussionmentioning

confidence: 92%

Mass marking of stocked European glass eels (Anguilla anguilla) with alizarin red S

Caraguel¹,

Charrier²,

Mazel³

et al. 2014

Ecology of Freshwater Fish

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This study describes a mass marking method suitable for European glass eel Anguilla anguilla, avoiding osmotic shock and reducing fish stress. During a single day, 360,000 glass eels intended for a stocking operation were bathed into an alizarin red S (ARS) solution, at a density of 346 ind.Ál À1 before being released into a freshwater marsh along with unmarked glass eels. After 15 days, examination of marked and unmarked eels kept in enclosures in the marsh showed 100% of otoliths had been successfully marked and that no excess deaths related to marking process had occurred. Seven months after stocking, results from biometric measurements and otolith analysis, carried out on a sample of 53 elvers caught by electrofishing and belonging to the size class of the 0 + cohort, suggest that: (i) the proportions of marked and unmarked remained unchanged, hence suggesting that the marking process had not caused excess mortality, (ii) there was no difference in length, body mass or condition factor between marked and unmarked individuals, demonstrating that marking had caused no harmful effect after 7 months, and (iii) ARS marks in otoliths remained clearly visible. The benefits of this ARS mass marking technique are discussed through a stocking operation.

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Caracteristiques Biologiques Des Civelles (Anguilla Anguilla) Lors De La Transition en Estuaire.

Cited by 11 publications

References 27 publications

Swimming activity and behaviour of European Anguilla anguilla glass eels in response to photoperiod and flow reversal and the role of energy status

Swimming activity and behaviour of European Anguilla anguilla glass eels in response to photoperiod and flow reversal and the role of energy status

Temporal patterns in the upstream migration of European glass eels (Anguilla anguilla) at the Couesnon estuarine dam

Mass marking of stocked European glass eels (Anguilla anguilla) with alizarin red S

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