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Auteur Carbonara, P.; Zupa, W.; Anastasopoulou, A.; Bellodi, A.; Bitetto, I.; Charilaou, C.; Chatzispyrou, A.; Elleboode, R.; Esteban, A.; Follesa, M.C.; Isajlovic, I.; Jadaud, A.; Garcia-Ruiz, C.; Giannakaki, A.; Guijarro, B.; Kiparissis, S.E.; Ligas, A.; Mahe, K.; Massaro, A.; Medvesek, D.; Mytilineou, C.; Ordines, F.; Pesci, P.; Porcu, C.; Peristeraki, P.; Thasitis, I.; Torres, P.; Spedicato, M.T.; Tursi, A.; Sion, L.
Titre Explorative analysis on red mullet (Mullus barbatus) ageing data variability in the Mediterranean Type Article scientifique
Année 2019 Publication Revue Abrégée Sci. Mar.
Volume 83 Numéro Pages 271-279
Mots-Clés age variability; age-determination; assessments; date of birth; eastern baltic cod; false rings; fish; fisheries; l. 1758; Mediterranean; medits; Mullus barbatus; perciformes-mullidae; protocols; quality-control; reader effect; sea
Résumé The uncertainty in age estimation by otolith reading may be at the root of the large variability in red mullet (Mullus barbatus) growth models in the Mediterranean. In the MEDITS survey, red mullet age data are produced following the same sampling protocol and otolith reading methodology. However, ageing is assigned using different interpretation schemes, including variations in theoretical birthdate and number of false rings considered, in addition to differences in the experience level of readers. The present work analysed the influence of these variations and the geographical location of sampling on red mullet ageing using a multivariate approach (principal component analysis). Reader experience was the most important parameter correlated with the variability. The number of rings considered false showed a significant effect on the variability in the first age groups but had less influence on the older ones. The effect of the theoretical birthdate was low in all age groups. Geographical location had a significant influence, with longitude showing greater effects than latitude. In light of these results. workshops, exchanges and the adoption of a common ageing protocol based on age validation studies are considered fundamental tools for improving precision in red mullet ageing.
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Auteur institutionnel Thèse
Editeur Lieu de Publication Éditeur
Langue English Langue du Résumé Titre Original
Éditeur de collection Titre de collection Titre de collection Abrégé
Volume de collection Numéro de collection Edition
ISSN 0214-8358 ISBN Médium
Région Expédition Conférence
Notes WOS:000504829900020 Approuvé pas de
Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2725
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Auteur Tessier, A.; Blin, C.; Cottet, M.; Kue, K.; Panfili, J.; Chanudet, V.; Descloux, S.; Guillard, J.
Titre Life history traits of the exploited Nile Tilapia (Oreochromis niloticus – Cichlidae) in a subtropical reservoir (Lao PDR) Type Article scientifique
Année 2019 Publication Revue Abrégée Cybium
Volume 43 Numéro 1 Pages 71-82
Mots-Clés age-determination; community; fish; Fisheries; growth; l.; Man-made Lake; man-made lakes; nam theun 2; Otolith; perciformes; phytoplankton; population; South-East Asia
Résumé Biological traits of Oreochromis niloticus were studied in order to identify potential differences between the population of the Nam Theun 2 Reservoir and other populations in Asia and in Africa. The study also aimed to characterize the demographic structure of the exploited population by fisheries in the reservoir. Toluidine-stained transverse section of otoliths from 322 specimens, collected between November 2015 and January 2017, were analysed to identify the periodicity of annulus formation and to age individuals. Length, weight, sex and sexual maturity stage were recorded. Life history traits were characterized by length-weight and length age relationships. The periodicity of annulus formation was annual, with complete formation of the translucent zone at the beginning of the warm and wet season (June and July). The length-age key has been established and was composed of 9 age classes, ranging from 0 to 8 years old. Males showed positive allometric growth whereas juveniles and females exhibited isometric growth. The study showed an asymptotic standard length of 658 mm and a low growth rate (K = 0.08 year(-1)). The sex ratio was equilibrated, and first maturity of females was at 277 mm standard length. The population was composed of individuals aged 3 years old and older, and 60% of the landings were composed of individuals aged 5 years and older. The growth rate was lower than for Asian and African populations, and the age-length key provided was specific to the studied reservoir. However, some biological traits of the O. niloticus population were similar to those found for other population in the world: (i) formation of an annual annulus during the reproduction period, at the beginning of the warm and wet season like populations from subtropical countries, and (ii) an isometric or a positive allometric growth as seen in populations that were not overexploited and were living in favourable environmental conditions. Therefore, the present study suggests that the O. niloticus population of the NT2 Reservoir was not overexploited at the time of the survey.
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Langue English Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 0399-0974 ISBN Médium
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Notes Approuvé pas de
Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2553
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