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| Registros recuperados: 43 | |
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| 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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| Doray, Mathieu; Petitgas, Pierre; Romagnan, Jean-baptiste; Huret, Martin; Duhamel, Erwan; Dupuy, Christine; Spitz, Jérôme; Berger, Laurent; Dorémus, Ghislain; Bourriau, Paul; Grellier, Patrick; Massé, Jacques; Sanchez, Florence. |
| The initial objective of the PELGAS integrated survey was to assess the biomass of small pelagic fish in the Bay of Biscay in spring. Sampling has been extended to study the spatial structure and dynamics of the pelagic ecosystem in springtime. The PELGAS survey has produced since 2000 long-term time-series of spatially-explicit data and indices, describing the main pelagic ecosystem components: hydrology, phytoplankton, mesozooplankton, fish and megafauna. In addition to small pelagic fish biomass estimates used for fish stock assessment, the survey now delivers two types of ecosystem products: standard gridded maps of ecosystem parameters, and a time series dataset of indicators of the Bay of Biscay pelagic ecosystem state. The evolution of the PELGAS... |
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| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00457/56844/58693.pdf |
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| Trenkel, Verena; Vaz, Sandrine; Albouy, Camille; Brind'Amour, Anik; Duhamel, Erwan; Laffargue, Pascal; Romagnan, Jean-baptiste; Simon, Julien; Lorance, Pascal. |
| The negative impacts that scientific monitoring may have on marine ecosystems has been a neglected topic, mainly on the basis that its magnitude is minor compared to commercial fisheries, even though this raises ethical and, in certain cases, conservation issues. We argue that ethical principles should lead us to reconsider marine wildlife resource monitoring such as the fish and shellfish trawl surveys providing the science-based evidence needed for fisheries management and assessment of how environmental change impacts marine shelf communities worldwide. Recent scientific and technological progress has provided methods and tools which might now be harnessed to reduce the impact of marine monitoring. We review these alternative methods, consider... |
| Tipo: Text |
Palavras-chave: Monitoring ethics; Marine surveying; Impacts of bottom trawling; Genetic methods; Ecosystem-based management. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00470/58161/60665.pdf |
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| Véron, Matthieu; Duhamel, Erwan; Bertignac, Michel; Pawlowski, Lionel; Huret, Martin; Baulier, Loic. |
| Age and size at maturation appear as key parameters governing the dynamics of a population as they affect growth rate, fecundity, and survival. The expression of such life history traits is determined by genetic make-up and modulated by environmental factors mainly through phenotypic plasticity. Moreover, fishing, besides decreasing population size and changing demographic composition can alter allelic frequencies through fisheries-induced evolution by selecting for some particular traits. In the Bay of Biscay, a decreasing trend in both sardine body condition and size-at-age has recently been pointed out at the population level. The Probabilistic Maturation Reaction Norm (PMRN) approach was applied to help disentangle phenotypic plasticity and genetic... |
| Tipo: Text |
Palavras-chave: Fisheries-induced evolution; Body condition; Phenotypic plasticity; Maturation; Growth; Sardina pilchardus; Bay of biscay. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00660/77203/78637.pdf |
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| Gatti, Paul; Cominassi, Louise; Duhamel, Erwan; Grellier, Patrick; Le Delliou, Herve; Le Mestre, Sophie; Petitgas, Pierre; Rabiller, Manuella; Spitz, Jerome; Huret, Martin. |
| There is a growing interest in monitoring body condition of marine organisms in the context of the ecosystem approach to fisheries and global change. Fish condition is under the influence of environmental variability on seasonal scale, but also on longer timescales. It represents a good indicator of habitat quality or individual fitness, and is also a relevant parameter to evaluate energy transfer through the trophic chain. However, the sources of variability in fish condition need to be accurately understood and the significance of existing indices has to be correctly assessed. Here, we measured the energy density, a precise and global indicator of fish bioenergetic condition, for anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) in the... |
| Tipo: Text |
Palavras-chave: Energy density; Calorimetry; Small pelagic fish; Engraulis encrasicolus; Sardina pilchardus; Northeast Atlantic. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00416/52754/53615.pdf |
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| Uriarte, A.; Rico, I.; Villamor, B.; Duhamel, Erwan; Duenas, C.; Aldanondo, N.; Cotano, U.. |
| Validation of the age determination procedure using otoliths of European anchovy in the Bay of Biscay was achieved by monitoring very strong year-classes in successive spring catches and surveys, as well as the seasonal occurrence of edge types. Historical corroboration of the ageing method was obtained by cross-correlation between successive age groups by year-classes in catches and surveys (1987–2013). Summary annual growth in length is also presented. Yearly annuli consist of a hyaline zone (either single or composite) and a wide opaque zone, disrupted occasionally by some typical checks (mainly at age-0 and age-1 at peak spawning time). Age determination, given a date of capture, requires knowledge of the typical annual growth pattern of otoliths,... |
| Tipo: Text |
Palavras-chave: Age estimation; Checks; Engraulidae; Otolith formation.. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00342/45343/44806.pdf |
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| Mahe, Kelig; Bellail, Robert; Dufour, Jean-louis; Boiron-leroy, Anne; Dimeet, Joel; Duhamel, Erwan; Elleboode, Romain; Felix, Jerome; Grellier, Patrick; Huet, Jerome; Labastie, Jacques; Le Roy, Didier; Lizaud, Oceann; Manten, Marie-line; Martin, Stephane; Metral, Luisa; Nedelec, Daniel; Verin, Yves; Badts, Vincent. |
| This document presents all the techniques used in routine by Ifremer to estimate the age of fish from the calcified piece. The procedure for estimating age describes each technical stage from the taking of the calcified piece through to the supplying of key sizes/ages to the European work groups. This procedure is specific to each species and even each population of fish. |
| Tipo: Text |
Palavras-chave: Poisson; TNPC; Préparation; Procédure; Age; Ecaille; Illicium; Otolithe; Sclérochronologie; Fish; TNPC; Preparation; Procedure; Age; Scale; Illicium; Otolith; Sclerochronology. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00000/7294/rapport-7294.pdf |
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| Duhamel, Erwan; Biseau, Alain; Masse, Jacques; Villalobos, Hector. |
| The french fishery of anchovy is divided in two groups defined by gears : purse seine and pelagic trawl. The average length of these vessels is about 20m. This fleet is very opportunistic : all trawlers are using several trawls during the year, to catch sometimes bass, tuna, hake, or scampi, and purse seine are mainly fishing sardine. Each year, the main anchovy catches are provided by pair trawlers. Purse seiners operate often in coastal areas (<10 nautical miles); trawlers may operate until 50 nautical miles offshore but are banned inside the three miles coastal zone. The pair trawlers may operate from Basque country to western Channel according to fish availability. Purse seiners usually stay around their home harbour. |
| Tipo: Text |
Palavras-chave: Pelagic trawl; Purse seine; Anchovy; Bay of Biscay; Acoustic; Survey; ICES; PELGAS; Chalut pelagic; Bolinche; Anchois; Golfe de Gascogne; Acoustique; Campagne oceanographique; CIEM; PELGAS. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/acte-2296.pdf |
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| Duhamel, Erwan; Doray, Mathieu; Huret, Martin; Sanchez, Florence; Lespagnol, Patrick; Doremus, Ghislain; Lemerre, Charlotte. |
| The Pelgas16 acoustic survey has been carried out with very good weather conditions (regular low wind, medium temperatures) for the whole area, from the South of the bay of Biscay to the west of Brittany. The help of commercial vessels (two pairs of pelagic trawlers and a single one) during 18 days provided about 120 valid identification hauls instead of about 60 before 2007 when Thalassa was alone to identify echotraces. Their participation increased the precision of identification of echoes and some double hauls permitted to confirm that results provided by the two types of vessels (R/V and Fishing boats) were comparable and usable for biomass estimate purposes. These commercial vessels participated to the PELGAS survey in a very good spirit of... |
| Tipo: Text |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00344/45546/45157.pdf |
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| Registros recuperados: 43 | |
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