scholarly journals A dynamic model of the Bay of Biscay pelagic fleet simulating fishing trip choice: the response to the closure of the European anchovy (Engraulis encrasicolus) fishery in 2005

2008 ◽  
Vol 65 (11) ◽  
pp. 2444-2453 ◽  
Author(s):  
Youen Vermard ◽  
Paul Marchal ◽  
Stéphanie Mahévas ◽  
Olivier Thébaud
Keyword(s):  
Behavioral Model ◽  
Random Utility ◽  
Bay Of Biscay ◽  
Multivariate Statistical Methods ◽  
Multivariate Statistical ◽  
Fishing Activity ◽  
Fishing Trip ◽  
European Anchovy ◽  
Engraulis Encrasicolus ◽  
European Anchovy Engraulis Encrasicolus

The scope of this paper is to describe, evaluate, and forecast fishing trip choices of the Bay of Biscay pelagic fleet using random utility modeling (RUM). First, alternative fishing trip choices of this fleet were identified using multivariate statistical methods based on species landings weighted by value and defined as distinct fishing activity or fisheries (termed métiers). A RUM was specified, which included trip components as attributes during the period 2001–2004 (a lagged percentage of the value per unit of effort of the main species caught, total value per unit of effort, and inertia in terms of changes from one métier to another). For the main métiers, the proportion of correct effort allocation is 90% during the calibration period of 2001–2004. The results from the RUM are used to parameterize a simulation model of trip choice. The model is used to predict trip choices in 2005, throughout most of which fishing was constrained by the closure of the European anchovy (Engraulis encrasicolus) fishery. Simulation results are compared with observed trip choices following the fishing ban: 80% of observed trip choices are correctly predicted by the model. The capacity of the behavioral model to predict responses to the closure is then discussed.

scholarly journals Microsatellite variability in European anchovy (Engraulis encrasicolus) calls for further investigation of its genetic structure and biogeography

2009 ◽  
Vol 66 (10) ◽  
pp. 2176-2182 ◽  
Author(s):  
Iratxe Zarraonaindia ◽  
Miguel Angel Pardo ◽  
Mikel Iriondo ◽  
Carmen Manzano ◽  
Andone Estonba
Keyword(s):  
Genetic Structure ◽  
Random Mating ◽  
Western Mediterranean ◽  
Null Alleles ◽  
Recent Common Ancestor ◽  
Bay Of Biscay ◽  
Genetic Stock ◽  
European Anchovy ◽  
Engraulis Encrasicolus ◽  
European Anchovy Engraulis Encrasicolus

Abstract Zarraonaindia, I., Pardo, M. A., Iriondo, M., Manzano, C., and Estonba, A. 2009. Microsatellite variability in European anchovy (Engraulis encrasicolus) calls for further investigation of its genetic structure and biogeography. – ICES Journal of Marine Science, 66: 2176–2182. Attention to genetic and ecological perspectives can enhance strategies for using fishery resources sustainably. A potentially important application is the use of molecular markers to assess the genetic stock structure of a harvested species. In this study, seven microsatellite markers were analysed in anchovy samples from the Bay of Biscay, the Gulf of Cádiz, and the Gulf of Lions to assess the genetic structure of anchovy (Engraulis encrasicolus) populations in the Bay of Biscay and to infer the biogeographic origin of these populations. All samples showed a deficit of heterozygotes that could be explained by non-random mating, Wahlund's effect, and especially by the presence of null alleles. Global FST and RST values, uncorrected and corrected for null alleles, were significant. There was significant genetic heterogeneity between two populations in the Bay of Biscay, suggesting that anchovy there may not be panmictic. Moreover, the results reinforce the hypothesis of a recent common ancestor shared by Bay of Biscay and western Mediterranean anchovy. These results, together with those of earlier studies, suggest merit in further investigating spatio-temporal genetic variation among anchovy populations in the Northeastern Atlantic.

scholarly journals Mitochondrial DNA and microsatellite genetic differentiation in the European anchovy Engraulis encrasicolus L.

2012 ◽  
Vol 69 (8) ◽  
pp. 1357-1371 ◽  
Author(s):  
Yaisel J. Borrell ◽  
Jorge A. Piñera ◽  
José A. Sánchez Prado ◽  
Gloria Blanco
Keyword(s):  
Mitochondrial Dna ◽  
Genetic Differentiation ◽  
Basque Country ◽  
Sequence Divergence ◽  
Bay Of Biscay ◽  
European Anchovy ◽  
Engraulis Encrasicolus ◽  
Polymerase Chain ◽  
The Mediterranean ◽  
European Anchovy Engraulis Encrasicolus

Abstract Borrell, Y. J., Piñera, J. A., Sanchez Prado, J. A., and Blanco, G. 2012. Mitochondrial DNA and microsatellite genetic differentiation in the European anchovy Engraulis encrasicolus L. – ICES Journal of Marine Science, 69: . The European anchovy Engraulisencrasicolus is currently one of the principal target species for commercial fisheries in Europe, and most stocks are overfished at present. In this work, specimens were sampled in the Bay of Biscay (Cantabrian, Basque Country, and French coasts) in 2009 and also in the Mediterranean (Adriatic Sea). Mitochondrial DNA (mtDNA; cytochrome b and 16S) was sequenced, and 14 nuclear microsatellites showing high and low levels of polymorphism were arranged in three multiplex polymerase chain reaction (PCR) systems and genotyped. Two main ancient mitochondrial clades were found. These clades are separated by 15 mutational steps and 1.7% sequence divergence, corresponding to a separation time of ∼0.5 million years ago. Our results using both mtDNA and microsatellites suggest the presence of at least three genetically differentiated groups: the west Cantabrian Sea, the rest of the populations in the Bay of Biscay, and the Mediterranean. Although it is known that western Iberian Atlantic populations of E. encrasicolus may be genetically different from those of the Bay of Biscay, the results suggest that the transition between these groups may be as close as a 100 km and that a recent genetic homogenization process in the eastward area of the Bay of Biscay has probably occurred.

Growth and feeding patterns of European anchovy (Engraulis encrasicolus) early life stages in the Aegean Sea (NE Mediterranean)

2010 ◽  
Vol 86 (2) ◽  
pp. 299-312 ◽  
Author(s):  
Ignacio A. Catalán ◽  
Arild Folkvord ◽  
Isabel Palomera ◽  
Gemma Quílez-Badía ◽  
Fotini Kallianoti ◽  
...  
Keyword(s):  
Early Life ◽  
Aegean Sea ◽  
Life Stages ◽  
Early Life Stages ◽  
Feeding Patterns ◽  
European Anchovy ◽  
Engraulis Encrasicolus ◽  
Ne Mediterranean ◽  
European Anchovy Engraulis Encrasicolus
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