scholarly journals Phenotypic plasticity in habitat use and growth of the European eel (Anguilla anguilla) in transitional waters in the Mediterranean area

2013 ◽  
Vol 23 (1) ◽  
pp. 65-76 ◽  
Author(s):  
Fabrizio Capoccioni ◽  
Dai-Yu Lin ◽  
Yoshiyuki Iizuka ◽  
Wann-Nian Tzeng ◽  
Eleonora Ciccotti
Keyword(s):  
Phenotypic Plasticity ◽  
Habitat Use ◽  
Anguilla Anguilla ◽  
Mediterranean Area ◽  
European Eel ◽  
Transitional Waters ◽  
The Mediterranean

scholarly journals Fishery and Aquaculture Relationship in the Mediterranean: Present and Future

2003 ◽  
Vol 4 (2) ◽  
pp. 125 ◽  
Author(s):  
G. RELINI
Keyword(s):  
Anguilla Anguilla ◽  
European Eel ◽  
Total Catch ◽  
Sharp Drop ◽  
Fishing Activity ◽  
Marine Fauna ◽  
Marine Research ◽  
The World ◽  
The Mediterranean ◽  
Aquaculture Production

Although the Mediterranean represents only 0.8% of the world seas, it is the site of a very long-established fishing activity, characterized mainly by multispecific catch and by artisanal or coastal activity, resulting from a mosaic of very diversified structures and gears, along more than 45,000 km of coastline. Two main biological features of this sea are the occurrence of a large richness of species (it represents 5.5% - 7% of world marine fauna and 16.6% of macrophyta), which stands in contrast with its ‘trophic poverty’ and the absence of large monospecific fishery, except for some small and large pelagic fish. Another biological characteristic of Mare Nostrumis the high invasion of exotic species, some exploited by fishery and aquaculture, some others quite dangerous. For the entire Mediterranean and Black Sea, the production (catch + aquaculture) had been steadily increasing over the period 1972-1988 from 1,140,000 t to 2,080,000 t . The period 1988-1991 has shown a drastic drop in catches (in 1991: 1,400,000 t). From 1990 to 1995 the total catch increased to 1,701,379 t then decreased and in 2000 reached 1,485,046 t . In 2000 Turkey had the first place with 496,174 t, 26.9% of the total value (1,846,026 t, including fishing and aquaculture), followed by Italy with 25%, Greece 9%, Spain 7.6% and Algeria 5.4%. As in many parts of the world, aquaculture production in the Mediterranean is rapidly expanding. In 1970 the total aquaculture production was about 18,297 t of which 74.3% produced in Italy. In 2000 a value of 358,614 t was reached, about 1/4 of the total fishery catch, while the world aquaculture production corresponds to half of the world total catch. Italy is still the main producer with 46.7% , followed by Greece with 21.5%, Turkey 9.9% and France 6.7%. A sharp drop in the production of the European eel ( Anguilla anguilla) and of the European flat oyster ( Ostrea edulis) is recorded. Positive and negative interactions between fishery and aquaculture are described for environment, food, juveniles, breeders, discards and market. Special attention is devoted to tuna farming, artificial reef and vallicultura. The response of governments and decision makers to the results and suggestions from marine scientists, proposals for urgent action in order to succeed sustainability and priority marine research areas are briefly described. Some urgent needs are outlined.

scholarly journals Unsupervised Bayesian reconstruction of individual life histories from otolith signatures: case study of Sr:Ca transects of European eel (Anguilla anguilla) otoliths

2007 ◽  
Vol 64 (1) ◽  
pp. 152-165 ◽  
Author(s):  
Ronan Fablet ◽  
Françoise Daverat ◽  
Hélène De Pontual
Keyword(s):  
Habitat Use ◽  
Life Histories ◽  
Habitat Type ◽  
River Estuary ◽  
Anguilla Anguilla ◽  
Unsupervised Classification ◽  
European Eel ◽  
Otolith Growth ◽  
Individual Life ◽  
Growth Axis

The reconstruction of individual life histories from chemical otolith measures is stated as an unsupervised signal-processing issue embedded in a Bayesian framework. This computational methodology was applied to a set of 192 European eel (Anguilla anguilla) otoliths. It provided a robust and unsupervised analysis of the individual chronologies of habitat use (either river, estuary, or coastal) from Sr:Ca measures acquired along an otolith growth axis. Links between Sr:Ca values and habitat, age, and season and the likelihood of the transitions from one habitat type to another were modelled. Major movement characteristics such as age at transition between habitats and time spent in each habitat were estimated. As a straightforward output, an unsupervised classification of habitat use patterns showed great variability. Using a hidden Markov model, 37 patterns of habitat use were found, with 20 different patterns accounting for 90% of the sample. In accordance with literature, residence behaviour was observed (28% of the eels). However, about 72% changed habitat once or several times, mainly before age 4. The potential application of this method to any other measures taken along an otolith growth axis to reconstruct individual chronologies gives a new insight in life history tactics analysis.

Habitat use by the European eel Anguilla anguilla in Irish waters

2006 ◽  
Vol 67 (4) ◽  
pp. 569-578 ◽  
Author(s):  
T. Arai ◽  
A. Kotake ◽  
T.K. McCarthy
Keyword(s):  
Habitat Use ◽  
Anguilla Anguilla ◽  
European Eel

scholarly journals Cause or consequence? Exploring the role of phenotypic plasticity and genetic polymorphism in the emergence of phenotypic spatial patterns of the European eel

2017 ◽  
Vol 74 (7) ◽  
pp. 987-999 ◽  
Author(s):  
Maria Mateo ◽  
Patrick Lambert ◽  
Stéphane Tetard ◽  
Martin Castonguay ◽  
Bruno Ernande ◽  
...  
Keyword(s):  
Life History ◽  
Phenotypic Plasticity ◽  
Habitat Selection ◽  
Life History Traits ◽  
Environmental Variability ◽  
Anguilla Anguilla ◽  
European Eel ◽  
Anthropogenic Pressures ◽  
The Impact

The European eel (Anguilla anguilla), and generally, temperate eels, are relevant species for studying adaptive mechanisms to environmental variability because of their large distribution areas and their limited capacity of local adaptation. In this context, GenEveel, an individual-based optimization model, was developed to explore the role of adaptive phenotypic plasticity and genetic-dependent habitat selection, in the emergence of observed spatial life-history traits patterns for eels. Results suggest that an interaction of genetically and environmentally controlled growth may be the basis for genotype-dependent habitat selection, whereas plasticity plays a role in changes in life-history traits and demographic attributes. Therefore, this suggests that those mechanisms are responses to address environmental heterogeneity. Moreover, this brings new elements to explain the different life strategies of males and females. A sensitivity analysis showed that the parameters associated with the optimization of fitness and growth genotype were crucial in reproducing the spatial life-history patterns. Finally, it raises the question of the impact of anthropogenic pressures that can cause direct mortalities but also modify demographic traits and act as a selection pressure.

scholarly journals Occurrence and habitat use of European eel (Anguilla anguilla) in running waters: lessons for improved monitoring, habitat restoration and stocking

2019 ◽  
Vol 53 (4) ◽  
pp. 639-650 ◽  
Author(s):  
Erik Degerman ◽  
Carl Tamario ◽  
Johan Watz ◽  
P. Anders Nilsson ◽  
Olle Calles
Keyword(s):  
Habitat Use ◽  
Habitat Restoration ◽  
Anguilla Anguilla ◽  
European Eel ◽  
Running Waters

scholarly journals Diet-induced phenotypic plasticity in European eel (Anguilla anguilla)

2016 ◽  
Vol 219 (3) ◽  
pp. 354-363 ◽  
Author(s):  
Jens De Meyer ◽  
Joachim Christiaens ◽  
Dominique Adriaens
Keyword(s):  
Phenotypic Plasticity ◽  
Anguilla Anguilla ◽  
European Eel

scholarly journals First evidence of European eels exiting the Mediterranean Sea during their spawning migration

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Elsa Amilhat ◽  
Kim Aarestrup ◽  
Elisabeth Faliex ◽  
Gaël Simon ◽  
Håkan Westerberg ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
Anguilla Anguilla ◽  
European Eel ◽  
Migration Route ◽  
Spawning Site ◽  
Mediterranean Countries ◽  
Mesopelagic Zone ◽  
Gibraltar Strait ◽  
The Mediterranean

Abstract The migration route and the spawning site of the European eel Anguilla anguilla are still uncertain. It has been suggested that the Mediterranean eel stock does not contribute to spawning because there is no evidence of eels leaving the Mediterranean Sea. To test this hypothesis, we equipped eight female silver eels from the south of France with pop-up satellite tags during escapement from coastal waters. Once in deeper water, the eels quickly established diel vertical migration (DVM) between the upper and lower mesopelagic zone. Five tagged eels were taken by predators within the Mediterranean, but two eels reached the Atlantic Ocean after six months and at distances greater than 2000 km from release. These eels ceased their DVM while they negotiated the Gibraltar Strait, and remained in deep water until they reached the Atlantic Ocean, when they recommenced DVM. Our results are the first to show that eels from Mediterranean can cross the Strait of Gibraltar and continue their migration into the Atlantic Ocean. This finding suggests that Mediterranean countries, as for other EU states, have an important role to play in contributing to conservation efforts for the recovery of the European eel stock.

scholarly journals Phenotypic plasticity of habitat use by three temperate eel species, Anguilla anguilla, A. japonica and A. rostrata

2006 ◽  
Vol 308 ◽  
pp. 231-241 ◽  
Author(s):  
F Daverat ◽  
KE Limburg ◽  
I Thibault ◽  
JC Shiao ◽  
JJ Dodson ◽  
...  
Keyword(s):  
Phenotypic Plasticity ◽  
Habitat Use ◽  
Anguilla Anguilla

scholarly journals Quantifying 60 years of declining European eel (Anguilla anguilla L., 1758) fishery yields in Mediterranean coastal lagoons

2015 ◽  
Vol 73 (1) ◽  
pp. 101-110 ◽  
Author(s):  
Emilius Aalto ◽  
Fabrizio Capoccioni ◽  
Juan Terradez Mas ◽  
Marcello Schiavina ◽  
Chiara Leone ◽  
...  
Keyword(s):  
Mediterranean Basin ◽  
Coastal Lagoons ◽  
Anguilla Anguilla ◽  
Current Status ◽  
European Eel ◽  
Lower Productivity ◽  
Population Dynamics Model ◽  
Southern Mediterranean ◽  
The Mediterranean ◽  
The Mediterranean Basin

Abstract The European eel Anguilla anguilla is thought to be in a multi-decadal decline across its range. Although its northern Atlantic sub-populations are well-studied, little is known about the historical trend and current status of eel stock in the Mediterranean Sea. To fill this gap, we gathered catch data for 86 lagoon fisheries in nine countries across the Mediterranean basin and analysed historical trends and geographical and environmental patterns. We found a region-wide decline in eel catch, beginning in the mid-1970s and exceeding the simultaneous decline in non-eel fisheries, as well as lower productivity in larger lagoons and those in the southern Mediterranean. Additionally, we developed a population dynamics model to provide a preliminary estimate of pristine, potential, and actual escapement of spawning adults (silver eels) across the Mediterranean basin under historical and current conditions. Model results suggest that current escapement is 35% of escapement at pristine biomass levels, <40% target set by EC regulation 1100/2007. Furthermore, we estimate that a complete closure of lagoon fisheries would achieve 57% of pristine escapement under current recruitment levels. Though preliminary, this analysis represents a first step towards a full assessment of the role of the Mediterranean sub-population in overall eel stock recovery.

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