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Registros recuperados: 130
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A review of image-based tools for automatic fish ageing from otolith features ArchiMer
Carbini, Sebastien; Chessel, Anatole; Benzinou, Abdesslam; Fablet, Ronan; Mahe, Kelig; De Pontual, Helene.
Most of European fish stocks are assessed using age-based models, and otolith interpretation for age estimations costs several million euros annually. In this context, automated ageing systems would provide a mean to 1) standardize ageing, 2) control ageing consistency within and between ageing laboratories 3) build interpreted image data bases ensuring the information conservation and sharing and 4) improve growth studies while reducing the cost of the acquisition of age data. This paper presents a review of different image-based tools for automatic fish ageing from otolith features within the framework of AFISA (EU STREP project on Automated FISh Ageing coordinated by Ifremer). The full automatic ageing process can be divided into three main steps: 1)...
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Ano: 2008 URL: http://archimer.ifremer.fr/doc/00024/13519/10546.pdf
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Activité et production des navires français – Façade "Manche est" et Façade "Loire-Gironde" ArchiMer
Delpech, Jean-paul; Mehault, Sonia; Rostiaux, Emilie; Leaute, Jean-pierre; Leblond, Emilie; Demaneche, Sebastien; Coppin, Franck; Mahe, Kelig; Vaz, Sandrine.
This report is a result of a contract between Ifremer and the French Ministry of Industry. The aim was to provide map the fisheries activity and landings for french fishing vessels, located in the Eastern Channel and the Bay of Biscay during the year 2005. Two areas have been selected: - the "Eastern Channel" area, including 7 administrative departments : Nord, Pas-de-Calais, Somme, Seine-Maritime, Eure, Calvados and Manche. - the "Loire-Gironde" area, including 4 administrative departments : Loire-Atlantique, Vendée, Charente-Maritime and Gironde.
Tipo: Text Palavras-chave: Fishing fleets; Fishing gears; Bay of Biscay; Eastern Channel; Mapping; Landings; Fisheries activity; Flottilles; Pêche; Engins; Golfe de Gascogne; Manche est; Cartographie; Production; Activité halieutique.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/rapport-6645.pdf
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Age and Growth of Phycis Phycis (Linne, 1766) in the Gulf of Tunis ArchiMer
Romdhani, Ahlem; Chater, Ines; Ktari, Mohamed Hédi; Dufour, Jean-louis; Mahe, Kelig.
The age of fish in a population is fundamental to most of the questions fishery biologists attempt to answer about that population. The aim of this study was to report the parameters of the weight-length relationship and to estimate the age and growth of Phycis phycis (Linnaeus, 1766) in Gulf of Tunis. A sample of 272 specimens of P. phycis was collected from the landings of the small-scale artisanal fisheries between September 2007 and June 2010. The total length (TL) ranged from 14 to 55.5cm and total weight (TW) from 45 to 1779g. Length-weight relationship were described by allometrically positive for the females (TW = 0.0083*TL3. 0703), males (TW= 0.0063*TL3.1471), and both sexes (TW= 0.0082*TL3. 0759). No significant differences were found between...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00117/22790/20592.pdf
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Age and Growth of the lemon sole (Microstomus kitt) in the Celtic Sea and the North Sea ArchiMer
Mahe, Kelig; Elleboode, Romain; Persohn, Cecile; Dufour, Jean-louis.
Age and growth of lemon sole (Microstomus kitt) were determined from 115 specimens collected in the Celtic Sea and in the North Sea in 2006 and 2007. Total length is ranged from 11 to 44 cm, while total weight varied between 12 and 1040 g. Age estimation was based on otoliths readings. The oldest male and female were estimated to be 9 years old. The length–weight relationships parameters for lemon sole in the Celtic Sea and in the North Sea were W=0.0043*TL3.2860 and W=0.0062*TL3.1505 respectively. Weight including both sexes increased with positive allometric growth. The von Bertalanffy growth equation in the North Sea was fitted on the basis of mean length-at-age data resulting in parameters values of TL∞ = 36.44 cm (S.E. = 0.484), K = 0.187 /y (S.E. =...
Tipo: Text Palavras-chave: Lemon sole; Growth; Von Bertalanffy; Celtic Sea; North Sea.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00019/13024/10002.pdf
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Age and growth of the striped seabream, Lithognathus mormyrus (Actinopterygii: Perciformes: Sparidae), in the central coast of Algeria, Mediterranean Sea ArchiMer
Boufersaoui, Samira; Kassar, Abderrahmane; Mokrane, Zakia; Elleboode, Romain; Mahe, Kelig.
Background. Striped seabream, Lithognathus mormyrus (Linnaeus, 1758), is a bony fish, which has a high economic value on the Algerian coast. Because of the increasing fishing pressure, however, a close monitoring is recommended. The information about the biology of this species, occurring in the south-western Mediterranean Sea and especially in the north African coast, is very limited. The presently reported study provides new estimated data on age and growth parameters of striped seabream in Algeria. Materials and methods. A total of 449 specimens of L. mormyrus were sampled for 2 years (January 2013 to December 2014) from the commercial fishery in the central part of the Algerian coast. The samples were collected monthly. The fish ranged in size from...
Tipo: Text Palavras-chave: Lithognathus mormyrus; Otolith; Age; Growth; Algerian coast; Mediterranean Sea.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00473/58448/61028.pdf
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Age determination of Atlantic cod (Gadus morhua): 2012 Workshop between Canada and France on cod otoliths. Final report of the project SALMOCODAGE ArchiMer
Mahe, Kelig; Schwab, Philippe; Hiscock, Charlie; Cossitt, Gus; Briand, Daniel; Goraguer, Herle.
France and Canada have been working closely together for numerous years under the governance of The Northwest Atlantic Fisheries Organisation (NAFO) that regulates fisheries in the Northwest Atlantic. This workshop was the first step to achieve greater agreement in the estimation of age from calcified pieces between the scientific experts from those 2 countries. The goal of this project is to realize a calibration of the estimation of ages from cod (Gadus morhua) between France and Canada in order to optimize the precision of the data supplied by those countries for stock assessment purposes. There has been in the past an internal workshop for Atlantic Canada in 1997 on ageing fish and numerous workshops for Northeast Atlantic, more precisely for the...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00115/22669/20396.pdf
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Age determination of Atlantic cod (Gadus morhua) : Results from an otolith exchange between Canada and France ArchiMer
Healey, B.p; Mahe, Kelig; Cossitt, G.; Dufour, Jean-louis; Felix, Jerome; Hicks, H.f.; Hiscock, C.; Schwab, P..
Atlantic cod (Gadus morhua) in NAFO subDivision 3Ps are exploited and jointly managed by Canada and France. Assessments of stock status incorporate age determinations from both countries when dis-aggregating total catches into catch-at-age. An otolith exchange was initiated to evaluate the degree of consistency in the age determinations of Canadian and French personnel. Both graphical and statistical analysis clearly indicate differences in interpretation between Canadian and French readers, with ages assigned by Canadian personnel generally being one-year greater than those of participants from France. However, consistency in age determinations was relatively high within Canada and within France.
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00035/14627/11905.pdf
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Age, growth and feeding of anchovy (Engraulis encrasicolus L.) in the Bay of Bénisaf (SW Mediterranean , west Algerian coast) ArchiMer
Bacha, Mahmoud; Amara, Rachid; Benmansour, N; Brylinski, Jean-michel; Moali, A; Mahe, Kelig.
Age, growth and feeding of anchovy were studied for the first time from samples collected in the Benisaf Bay (west Algerian coast) during summer (spawning period) and autumn (recruitment period) 2007. Age structure and growth parameters were determined by otolith (sagitta) analyses. The von Bertalanffy growth function fitted to age-length data showed that growth was almost achieved during the first year of life. Significant growth difference was recorded between males and females. Growth parameters were for females (L∞=17,46 cm, k=0,31 per year and t0= -3,46 years) and for male (L∞=16,67 cm, k= 0,35 per year and t0= -3,26 years). The parameters of the otoliths (surface, length, weight and width) were significantly correlated with age and fish length (LT)...
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Ano: 2009 URL: http://archimer.ifremer.fr/doc/00012/12277/9068.pdf
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Age, growth and mortality of Sciaena umbra (Sciaenidae) in the Gulf of Tunis ArchiMer
Chater, Ines; Romdhani-dhahri, Ahlem; Dufour, Jean-louis; Mahe, Kelig; Chakroun-marzouk, Nadia.
The growth and mortality of the brown meagre, Sciaena umbra from the Gulf of Tunis, were investigated using a sample of 276 specimens, ranging from 15.3 to 49.2 cm total length and from 43 to 1565 g total weight. Specimens were collected from artisanal fisheries between October 2008 and September 2011. Otoliths were extracted, thin cross-sections were realized and radii were measured. The log-linear morphometric relationships between total length-total weight and total length-otolith radius were significant (p < 0.05), showed positive allometry (b=3.15) and isometry (b=0.90), respectively. The marginal analysis suggested that only one growth increment was deposited per year. The maximum age of the brown meagre was 22 years for males and 31 years for...
Tipo: Text Palavras-chave: Brown meagre; Thin otoliths; Growth; Mortality; Gulf of Tunis; Mediterranean Sea.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00424/53552/54415.pdf
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Age, growth and mortality of the starry weever Trachinus radiatus Cuvier, 1829 in the Tunisian waters ArchiMer
Hamed, Oussama; Dufour, Jean-louis; Chakroun-marzouk, Nadia; Mahe, Kelig.
Age, growth and mortality of the Starry weever Trachinus radiatus were studied for the first time from 214 individuals collected in the Gulf of Tunis between February 2014 and January 2016. The significant relationship between length-weight was observed for males (a = 0.011, b = 2.992, R2 = 0.981, n = 77) and females (a = 0.010, b = 3.036, R² =0.957, n = 109). Age was estimated by the observation of otoliths transverse thin sections. Age of individuals ranged from 1 to 15 years. The precision was measured by two age estimations from two experts and indicated a good agreement between them (PA = 85.6%, CV = 3.8% and IAPE = 4.1%). The growth parameters of the von Bertalanffy model were TL∞ = 38.41 cm, W∞ = 507.47 g, K = 0.3396 year-1, t0 = 0 year for males...
Tipo: Text Palavras-chave: Growth; Age; Mortality; Trachinus radiatus; Starry weever; Gulf of Tunis; South-Central Mediterranean Sea.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00477/58905/61467.pdf
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Age precision and growth rate of Rhabdosargus haffara (Forsskål, 1775) from Hurghada fishing area, Red Sea, Egypt ArchiMer
Osman, Yassein A. A.; Mehanna, Sahar F; El-mahdy, Samia M; Mohammad, Ashraf S; Mahe, Kelig.
The age and growth of the haffara seabream, Rhabdosargus haffara (Forsskål, 1775) from Hurghada fishing area, Red sea, Egypt, were investigated using a sample of 466 specimens. The fish length varied between 12.7 and 27.2 cm and the weight from 38.1 to 293.2 g. Samples were collected from the artisanal fisheries during the fishing season from August 2018 to July 2019. The relationship between the body lengths (total, fork and standard length in cm) and the body weight (g) was found to be significant (p < 0.05). The relationship between the body length and weight regarding the sex effect was insignificant for all samples (log W- log TL, ANCOVA, p > 0.05). The relationship between length and weight was estimated by a power regression function, with a...
Tipo: Text Palavras-chave: Age precision; Growth; Rhabdosargus haffara; Hurghada; Red Sea; Egypt stock assessment.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00623/73484/72774.pdf
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Ageage des buccins (Buccinum Undatum L) de la cote Ouest-Cotentin (France) à partir des statolithes ArchiMer
Cochard, Marie-laure; Elleboode, Romain; Mahe, Kelig.
La baie de Granville dans le golfe normano-breton, située en Manche Est, représente la principale région française et européenne de pêche du buccin (Buccinum undatum) et génère une activité économique importante (environ 8000 tonnes et 12 millions € par an). Cette pêcherie est exploitée par 50 à 60 caseyeurs (arts dormants). Elle est très encadrée réglementairement (licences, quotas journaliers, taille minimale de capture). Bien que la production estimée soit relativement stable ces dernières années, la pêcherie reste vulnérable car localisée dans la partie méridionale de l’aire de répartition de l’espèce et pourrait être impactée défavorablement par un réchauffement climatique (Cf. derniers scenarii du GIEC). En ce sens, le buccin pourrait constituer une...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00387/49801/50369.pdf
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Analyses sclérochronologiques d’écailles archéologiques d’ombres commun Thymallus thymallus et inférences sur la pêche paléolithique au Taillis des Coteaux (Vienne, France) ArchiMer
Guillaud, Emilie; Elleboode, Romain; Bearez, Philippe; Mahe, Kelig.
Lors des fouilles archéologiques du Taillis des Coteaux, plus de 791 écailles ont été mises au jour dans une zone attribuée chronologiquement au Magdalénien inférieur. L’origine (animale ou anthropique) des accumulations de poissons dans les sites archéologiques est souvent méconnue. L’application de la sclérochronologie à l’étude de ces restes nous permet non seulement d’avoir une estimation de l’âge du poisson, mais aussi de préciser la période de capture. La connaissance de la saison de mort des individus est un bon indicateur des activités humaines et/ou d’autres prédateurs (carnivores, oiseaux). La majorité des écailles est attribuable aux salmonidae. Parmi les espèces identifiées, seul l’ombre commun Thymallus thymallus (L., 1758) est bien...
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00187/29805/28251.pdf
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Are red mullet efficient as bio-indicators of mercury contamination? A case study from the French Mediterranean ArchiMer
Cresson, Pierre; Bouchoucha, Marc; Miralles, F.; Elleboode, Romain; Mahe, Kelig; Marusczak, Nicolas; Thebault, Herve; Cossa, Daniel.
Mercury (Hg) is one of the main chemicals currently altering Mediterranean ecosystems. Red mullet (Mullus barbatus and M. surmuletus) have been widely used as quantitative bio-indicators of chemical contamination. In this study, we reassess the ability of these species to be used as efficient bio-indicators of Hg contamination by monitoring during 18 months Hg concentrations in muscle tissue of mullet sampled from 5 French Mediterranean coastal areas. Mean concentrations ranged between 0.23 and 0.78 μg g−1 dry mass for both species. Values were consistent with expected contamination patterns of all sites except Corsica. Results confirmed that red mullets are efficient bio-indicators of Hg contamination. Nevertheless, the observed variability in Hg...
Tipo: Text Palavras-chave: Mercury; Bio-indicator; Fish; Mullus spp.; Mediterranean.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00244/35514/34083.pdf
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Atelier d'inter-calibration des estimations des petits pélagiques (Anchois et Sardine) en Atlantique. Boulogne sur mer, 14 au 15 mars 2018 ArchiMer
Mahe, Kelig; Duhamel, Erwan; Chantre, Celina; Bled Defruit, Geoffrey.
Cet atelier 2018 a été mis en place pour intercalibrer les estimations d'âge des anchois et des sardines en Atlantique entre Erwan Duhamel qui est le lecteur de ces espèces du golfe de Gascogne et Célina Chantre et Geoffrey Bled Defruit du pôle national de Sclérochronologie du laboratoire Ressources Halieutiques de Boulogne sur mer qui vont commencer à estimer l'âge de ces petits pélagiques dans le golfe de Gascogne. L'objectif est d'abord de calibrer les estimations d’âge pour ces 2 espèces de petits pélagiques dans le golfe de Gascogne et de revoir les moyens pour réaliser les images en mer lors de la campagne Pelgas et à terre en laboratoire. Cette intercalibration est basée sur la lecture d’images : 136 otolithes d'anchois et 140 otolithes de sardine...
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Ano: 2018 URL: http://archimer.ifremer.fr/doc/00434/54544/55913.pdf
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Automatic Fish Ageing (AFISA) ArchiMer
Mahe, Kelig; Parisi, Vincenc; Carbini, Sebastien; Soria, J.a.; Harbitz, A; De Pontual, Helene; Cotano, U; Songer, S; Millner, R; Lewy, P; Gudmundsson, E.f; Fablet, Ronan; Benzinou, Abdesslam.
Most of the fish stocks are assessed using age-based models, however age estimations using otoliths costs several million euros annually. In this context, Automatic Fish Ageing (EU Project) would provide means to standardize ageing among laboratories and build interpreted image databases ensuring the information conservation. Automation improves growth studies while reducing the cost of the acquisition of age data. The whole processing chain from the acquisition of otolith data to the actual ageing issue using pattern recognition or statistical inference has been realised for three case studies : a) Cod (Gadus morhua ; Faeroes, North Sea, North East Arctic) b) Anchovy (Engraulis encrasicolus ; Bay of Biscay) c) Plaice (Pleuronectes platessa, Eastern...
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Ano: 2009 URL: http://archimer.ifremer.fr/doc/00011/12270/10548.pdf
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Black scorpionfish Scorpaena porcus (Scorpaenidae): a first record in the eastern English Channel ArchiMer
Mahe, Kelig; Goascoz, Nicolas; Dufour, Jean-louis; Iglesias, Samuel; Tetard, Alain.
This is the first record of the black scorpionfish Scorpaena porcus being found in the eastern English Channel. A specimen was caught on 15 October 2012 off the port of Courseulles-sur-mer. It measured 31.6 cm and weighted 800 g. From a study of its sagittal otolith, this specimen appeared to be 9 years old.
Tipo: Text Palavras-chave: Scorpaena porcus; First record; Eastern English Channel; Atlantic Ocean; Otolith.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00173/28418/26748.pdf
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Blue whiting otoliths pair’s symmetry side effect ArchiMer
Gonçalves, Patricia; Mahe, Kelig; Elleboode, Romain; Chantre, Celina; Murta, Alberto; Avila De Melo, Antonio; Cabral, Henrique.
Otoliths are paired calcified structures located in the inner ear of the teleost fishes. Fisheries scientists have been using the otoliths for a variety of applications as fish ageing, species identification and also species interaction. The symmetry between left and right otoliths is considered species dependent. The application of analysis techniques on otoliths images has been increasing in recent years. The diagnosis on otoliths symmetry as a species characteristic is currently being done. It is expected that the otolith surface (distal versus proximal) used to collect images should have no influence on the symmetry results. The goal of this study is to investigate if the otolith position (distal versus proximal) when analyse images has influence in...
Tipo: Text Palavras-chave: Otoliths image analysis; Morphometry analysis; Fish otoliths; Marine science application; Elliptic Fourier analysis.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00388/49887/50448.pdf
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Calcein and manganese experiments for marking the shell of the common cockle (Cerastoderma edule): tidal rhythm validation of increments formation ArchiMer
Mahe, Kelig; Bellamy, Elise; Lartaud, Franck; De Rafelis, Marc.
This work focuses on investigating the potential of calcein and manganese as growth markers of the common cockle (Cerastoderma edule) in the bay of Somme (France). Recapture of shells, previously marked using a chemical marking and then bred in natural conditions, was performed in order to determine the shell growth patterns. Calcein marking has shown a fluorescent increment in shells after only 30 min immersion time at 150 mg L-1, but also for shells immersed 3 h at 50 mg L-1. Likewise, manganese shell marking was revealed under cathodoluminescence for shells immersed 1 h at 120 mg L-1 as well as for shells which spent 4 h at 90 mg L-1. A numerical analysis performed on each marked cockles has revealed 23 micro-increments between the mark and the ventral...
Tipo: Text Palavras-chave: Calcein; Manganese; Marking; Cathodoluminescence; Shellfish; Cerastoderma edule.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00025/13649/10758.pdf
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Cod (Gadus morhua) in the Celtic Sea otolith exchange 2016. ArchiMer
Mahe, Kelig; Dufour, Jean-louis; Brown, D; Smith, J; Beattie, S; Woods, F.
In this working document, the results of an otolith exchange 2016 on Cod (Gadus morhua) in the Celtic Sea are presented. Each year, stock assessment of cod in the Celtic Sea requires data to be compiled and compared. For example the age distribution from this year’s assessment is compared to historical data. In 2016, there has been a small number of one year olds. Consequently, the three main countries (France, Ireland and UK England) which contribute to the cod landings in Celtic Sea organised a small otolith exchange to verify the precision of age data between four readers. Mean precision of age estimate for individual fish had a coefficient of variation (CV) of 0.2% and percent agreement to modal age of 99.5%. There was only one image where two readers...
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Ano: 2016 URL: http://archimer.ifremer.fr/doc/00333/44437/44105.pdf
Registros recuperados: 130
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