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Registros recuperados: 64
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Understanding the Population Structure of the European Anchovy (Engraulis encrasicolus) in the Black Sea, Mediterranean Sea and Northeast Atlantic Ocean by Using Otolith Shape Analysis ArchiMer
Akkus, Gizem; Jemaa, Sharif; Cemal Gucu, Ali; Marchal, Paul; Carbonara, Pierluigi; Bacha, Mahmoud; Amara, Rachid; Ernande, Bruno; Saraux, Claire; Mahe, Kelig.
European anchovy, Engraulis encrasicolus, is a small pelagic coastal marine fish largely spread from the North Sea to central Africa, including the entire Mediterranean and the Black and Azov Seas. The aim of the study is to understand the potential different population structure and their relationship between the Northeast Atlantic, Western, Eastern Mediterranean and the Black Sea anchovy population. The outlines of 2127 sagittal otoliths were collected from nineteen locations (English Channel, Atlantic, the Mediterranean and Black Sea), and added to existing information available from a previous study. Elliptical Fourier Analysis (EFA) was used to analyze the otolith shape variations among locations. Before examining the geographical differentiation by...
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Ano: 2018 URL: http://archimer.ifremer.fr/doc/00436/54722/56157.pdf
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Channel and North Sea ray stock assessment in a data limited framework ArchiMer
Amelot, Morgane; Bastleer, Jurgen; Foucher, Eric; Girardin, Raphael; Marchal, Paul; Poos, Jan Jaap; Sys, Klaas.
Rajidae stocks (Raja clavata, Raja brachyura, Raja montagui, Raja microocellata, Leucoraja naevus and Raja undulata) in the English Channel and North Sea (ICES divisions 3a, 4 and 7d) are actually managed as a complex (“skates and rays”) and subject to a single TAC. TAC advices from the ICES are based on scientific survey indices trends from each species. Rajidae catches are mainly bycatch from flatfish fisheries such are sole (Solea solea) and plaice (Pleuronectes platessa) fisheries. Furthermore, because of their top predator position as well as their life history, Rajidae are species sensitive to overfishing. These different factors have led to a revision in stock assessment methods. ICES classified Rajidae as category 3 data limited stocks. The lack of...
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Ano: 2020 URL: https://archimer.ifremer.fr/doc/00620/73220/72433.pdf
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Developing a multispecific stocks MSE framework : English Channel and North Sea Rajidae complex ArchiMer
Amelot, Morgane; Batsleer, Jurgen; Foucher, Eric; Girardin, Raphael; Marchal, Paul; Poos, Jan Jaap; Sys, Klaas.
Six Rajidae stocks (Raja clavata, Raja brachyura, Raja montagui, Raja microocellata, Leucoraja naevus and Raja undulata) are currently exploited in the English Channel and North Sea area (ICES divisions 3a, 4 and 7d) and subject to a TAC regulation. This TAC is set based on monospecific approaches (abundance indices) when mangement is complex based. However, stock status disparities exist between these species. In this context a multispecific MSE (Management Strategy evaluation) framework has been developped based on DLMTool package from R. The main objective was to estimate the complex management impact at the different steps of stocks management (data collect, assessment, management measures implementation). The species species assessement and ...
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Ano: 2020 URL: https://archimer.ifremer.fr/doc/00652/76423/77495.pdf
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Exploring habitat credits to manage the benthic impact in a mixed fishery ArchiMer
Batsleer, J.; Marchal, Paul; Vaz, Sandrine; Vermard, Youen; Rijnsdorp, A. D.; Poos, J. J..
The performance of a combined catch quota and habitat credit system was explored to manage the sustainable exploitation of a mix of demersal fish species and reduce the benthic impacts of bottom trawl fisheries using a dynamic state variable model approach. The model was parameterised for the Eastern English Channel demersal mixed fishery using otter trawls or dredges. Target species differed in their association with habitat types. Restricting catch quota for plaice and cod had a limited effect on benthic impact, except when reduced to very low values, forcing the vessels to stay in port. Quota management had a minimal influence on fishing behaviour and hence resulted in a minimal reduction of benthic impact. Habitat credits may reduce the benthic impacts...
Tipo: Text Palavras-chave: Fleet dynamics; Dynamic state variable modelling; TAC; Total allowable catch; Mixed fisheries; Eastern English Channel; Plaice; Cod.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00418/52997/53997.pdf
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Mixed fisheries management: protecting the weakest link ArchiMer
Batsleer, Jurgen; Poos, J. J.; Marchal, Paul; Vermard, Youen; Rijnsdorp, A. D..
North Sea cod Gadus morhua stock is outside safe biological limits, and total allowable catch (TAC) management has proved ineffective to rebuild the stock. The European Commission is considering the imposition of a discard ban to preserve vulnerable and economically important fish stocks. We explored the potential effects of a discard ban in mixed fisheries management using the French mixed fisheries in the Eastern English Channel as a model system. We examined in particular the performance of 2 different management scenarios: (1) individual quota management with a tolerance for discarding and (2) individual quota management in combination with a discard ban, using a dynamic state variable model. The model evaluates a time series of decisions taken by...
Tipo: Text Palavras-chave: Discard ban; TAC; Dynamic State Variable Modelling; Eastern English Channel; Cod; Gadus morhua; Mixed fisheries; Fleet dynamics.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00137/24781/22834.pdf
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Inferring the annual, seasonal, and spatial distributions of marine species from complementary research and commercial vessels’ catch rates ArchiMer
Bourdaud, Pierre; Travers-trolet, Morgane; Vermard, Youen; Cormon, Xochitl; Marchal, Paul.
The objective of this study is to analyse at fine scale the annual, seasonal and spatial distributions of several species in the Eastern English Channel (EEC). On the one hand, data obtained from scientific surveys are not available all year through, but are considered to provide consistent yearly and spatially resolved abundance indices. On the other hand, on-board commercial data do cover the whole year, but generally provide a biased perception of stock abundance. The combination of scientific and commercial catches per unit of effort (CPUEs), standardized using a delta-generalized linear model, allowed to infer spatial and monthly dynamics of fish distributions in the EEC, which could be compared with previous knowledge on their life cycles....
Tipo: Text Palavras-chave: Commercial data; Eastern English Channel; Seasonality; Spatial distribution; Survey data.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00387/49805/50385.pdf
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Improving the interpretation of fishing effort and pressures in mixed fisheries using spatial overlap metrics ArchiMer
Bourdaud, Pierre; Travers-trolet, Morgane; Vermard, Youen; Marchal, Paul.
Managing mixed fisheries requires understanding fishers’ behaviour to allow predicting future fisheries distribution and impact on marine ecosystems. A new approach was developed to compare fine scale fishing effort distribution of Eastern English Channel (EEC) bottom trawlers, to the monthly- and spatially-resolved abundance distributions of commercial species. First, the added-value of using species-specific spatial overlap metric to quantify effective fishing effort and improve the relationship between fishing effort and fishing mortality was assessed. Second, based on the Ideal Free Distribution (IFD) theory, the species-specific weights given by fishers to different species were estimated by maximizing the overlap between target species assemblage and...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00446/55747/57402.pdf
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North Sea saithe Pollachius virens growth in relation to food availability, density dependence and temperature ArchiMer
Cormon, Xochitl; Ernande, Bruno; Kempf, Alexander; Vermard, Youen; Marchal, Paul.
North Sea saithe Pollachius virens, a major top predator in the area, supports the fishery economy of several European countries. However, recent stock assessments suggested a decrease in spawning stock biomass along with a decline in saithe mean weight-at-ages. In this context, we investigated North Sea saithe growth characteristics at the population level. First, saithe annual weight increments and age-length relationships were studied. Modelling of saithe age-length relationships was carried out using (1) the traditional von Bertalanffy growth function model, (2) the Verhulst logistic model and (3) an empirical linear model. Second, the effects of environmental factors on saithe growth were investigated. Explanatory environmental factors included food...
Tipo: Text Palavras-chave: Bottom-up processes; Von Bertalanffy growth function; Logistic growth; Norway pout; Prey availability effects; Density-dependence; Predator-prey interactions; Resource limitation; Competition.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00314/42499/41875.pdf
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Emergence of a new predator in the North Sea: evaluation of potential trophic impacts focused on hake, saithe, and Norway pout ArchiMer
Cormon, Xochitl; Kempf, Alexander; Vermard, Youen; Vinther, Morten; Marchal, Paul.
During the last 15 years, northern European hake (Merluccius merluccius) has increased in abundance, and its spatial distribution has expanded in the North Sea region in correlation with temperature. In a context of global warming, this spatial shift could impact local trophic interactions: direct impacts may affect forage fish through modified predator–prey interactions, and indirect impacts may materialize through competition with other resident predators. For instance, North Sea saithe (Pollachius virens) spatial overlap with hake has increased while saithe spawning-stock biomass has decreased recently notwithstanding a sustainable exploitation. In this context, we investigated the range of potential impacts resulting from most recent hake emergence in...
Tipo: Text Palavras-chave: Hake; Interspecific competition; Maximum sustainable yield; Multispecies stock assessment; Norway pout; Predator-prey interactions; Saithe; Simple foodweb; SMS.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00327/43794/45917.pdf
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Spatial interactions between saithe (Pollachius virens) and hake (Merluccius merluccius) in the North Sea ArchiMer
Cormon, Xochitl; Loots, Christophe; Vaz, Sandrine; Vermard, Youen; Marchal, Paul.
Spatial interactions between saithe (Pollachius virens) and hake (Merluccius merluccius) were investigated in the North Sea. Saithe is a well-established species in the North Sea, while occurrence of the less common hake has recently increased in the area. Spatial dynamics of these two species and their potential spatial interactions were explored using binomial generalized linear models (GLM) applied to the International Bottom Trawl Survey (IBTS) data from 1991 to 2012. Models included different types of variables: (i) abiotic variables including sediment types, temperature, and bathymetry; (ii) biotic variables including potential competitors and potential preys presence; and (iii) spatial variables. The models were reduced and used to predict and map...
Tipo: Text Palavras-chave: Biotic interactions; Competition; Generalized linear models; Hake; North Sea; Overlap; Predator-prey relationship; Saithe; Species distribution modelling.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00200/31146/29847.pdf
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Alimentation du maquereau en Manche ArchiMer
Cresson, Pierre; Timmerman, Charles-andre; Cordier, Remy; Couvreur, Clemence; Denamiel, Margaux; Engler, Alexandra; Lebon, Fabien; Lepretre, Marie-anais; Marchal, Paul.
This document summaries major information about the diet of mackerel Scomber scombrus in the English Channel, collected during the VARITROPH project. Mackerel consume quite exclusively copepods, with low effect of size on both diet and trophic level.
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Ano: 2021 URL: https://archimer.ifremer.fr/doc/00675/78716/80902.pdf
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Alimentation de la sole et de la plie en Manche ArchiMer
Cresson, Pierre; Timmerman, Charles-andre; Couvreur, Clemence; Denamiel, Margaux; Lepretre, Marie-anais; Marchal, Paul.
This document summaries major results about the diet of sole Solea solea and plaice Pleuronectes platessa in the English Channel, collected in the framework of the VARITROPH project. Both species have a similar diet, based on crustaceans, but plaice exhibit a larger diversity of secundary species (bivalves, annelids and echinoderms) than sole (annelids only). Diversity of the preys for plaice is explained by differences between size classes. Diet of small individuals is less diverse than the diet of large individuals. Trophic similarity between sole and plaice is also exhibited when comparing ontogenic changes of trophic levels, that are pretty similar for both species, and consistent with a diet based on small invertebrates.
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Ano: 2021 URL: https://archimer.ifremer.fr/doc/00675/78718/80904.pdf
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Alimentation du merlan en Manche ArchiMer
Cresson, Pierre; Timmerman, Charles-andre; Denamiel, Margaux; Millet, Lucie; Marchal, Paul.
This document summaries the major findings about the diet of whiting Merlangius merlangus in the English Channel, in the framework of the VARITROPH project. Whiting diet is based on several main preys, with an ontogenic variation. Individuals lower than 30 cm mostly fed on crustaceans, while diet of larger individuals is based on cephalopods and fishes. As a result, trophic level show 2 phases, one increasing at the early life stages, and a constant trophic level for individuals larger than 30 cm.
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Ano: 2021 URL: https://archimer.ifremer.fr/doc/00675/78717/80903.pdf
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Defining a pelagic typology of the eastern English Channel ArchiMer
Delavenne, Juliette; Marchal, Paul; Vaz, Sandrine.
Classifying marine habitats is a growing research field and is of increasing interest to spatial planners and managers. Most studies have predominantly focused on the seabed to determine benthic habitat types, and only limited attention has been paid to the water column. Classification projects aim at identifying candidate management units for the application of various regional or national regulations such as the European Water Framework Directive. Here, we propose a seasonal classification of the water column in the eastern English Channel, which we validated with biological data. For the three tested compartments, phytoplankton, zooplankton and pelagic fishes, the validation results were satisfactory, with recall values (i.e. percentage of observations...
Tipo: Text Palavras-chave: Eastern English Channel; Pelagic typology; Clustering analysis; Seasonality.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00125/23655/22689.pdf
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Feeding strategy of Downs herring larvae (Clupea harengus L.) in the English Channel and North Sea ArchiMer
Denis, Jeremy; Vallet, Carole; Courcot, Lucie; Lefebvre, Valerie; Caboche, Josselin; Antajan, Elvire; Marchal, Paul; Loots, Christophe.
This study aims to characterize the larval feeding strategy of the Downs sub-population of North Sea herring (Clupea harengus L.). Diet composition, vacuity rate and prey selectivity of larvae from 8 to 15 mm collected during the International Bottom Trawl Survey (IBTS) - MIK sampling from 2008 to 2013 were assessed by direct observation of their gut contents using Scanning Electron Microscopy (SEM). The high contribution of protists and small zooplanktonic prey observed in the gut contents proved the relevance of SEM to study the diet of first feeding larvae. The relatively low vacuity rate of 45% suggests that food may not be a limiting factor for Downs herring larvae in winter. These larvae appeared to be omnivorous and there was a clear shift in term...
Tipo: Text Palavras-chave: Diet; Feeding strategy; Selectivity index; Scanning electronic microscopy; Downs herring larvae; Gut content.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00345/45606/45226.pdf
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Feeding strategy of Downs herring larvae in the English Channel and North Sea ArchiMer
Denis, Jeremy; Vallet, Carole; Vincent, Dorothée; Courcot, Lucie; Marchal, Paul; Loots, Christophe.
The aim of this study was to characterize the feeding strategy of Downs herring larvae at "critical period" during winter in the English Channel and North Sea was defined to assess whether nutrition is responsible for low recruitment in stocks over the past years. Data collected during the French part of the International Bottom Trawl Survey from 2008 to 2014 were used to analyse fish larvae diet by direct observation using Scanning Electron Microscope (SEM). Gut content methods generally used for copepods was adapted to fish larvae to assess phytoplankton ingestion. The relative importance of small preys (0,5-375µm) observed in gut contents proved the essential role of SEM to better acknowledge Downs herring diet. We demonstrated that Downs herring larvae...
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00255/36608/35174.pdf
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Evaluating the histological-based condition of wild collected larval fish: A synthetic approach applied to common sole (Solea solea) ArchiMer
Di Pane, Julien; Gendrot, F.; Giraldo, Carolina; Marchal, Paul; Koubbi, Philippe; Loots, Christophe.
In the present study, the histological-based condition of common sole (Solea solea) larvae in the English Channel was evaluated to assess the relevance of experimentally-calibrated indices for wild collected specimens. Based on topographical observation of foregut, midgut, hindgut, liver and pancreas, each of the 202 larvae analysed was attributed one of the six grades of a condition index that was developed for sole in the nineties. In parallel, a synthetic table of 20 criteria historically used as condition indicators was created from an extensive review of the literature. These criteria were related to tissular integrity, cells height, nuclei, presence of prey and vacuolisation of the same five target organs. For each larva, each criterion was scored on...
Tipo: Text Palavras-chave: Condition index; Eastern English Channel; Fish larvae; Histology; Solea solea; Starvation.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00601/71325/69754.pdf
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Ontogenetic shift in the energy allocation strategy and physiological condition of larval plaice (Pleuronectes platessa) ArchiMer
Di Pane, Julien; Joly, Lea; Koubbi, Philippe; Giraldo, Carolina; Monchy, Sébastien; Tavernier, Eric; Marchal, Paul; Loots, Christophe.
Condition indices aim to evaluate the physiological status of fish larvae by estimating both the level of starvation and potential of survival. Histological indices reveal direct effects of starvation whereas biochemical indices such as lipid classes or RNA:DNA ratios are used as proxies of condition, giving information on the amount of energy reserves and growth rate, respectively. We combined these three indices to evaluate ontogenetic variations of growth performance, lipid dynamics and nutritional condition of plaice larvae caught in the field during winter 2017 in the eastern English Channel and the Southern Bight of the North Sea. RNA:DNA ratios showed that larvae at the beginning of metamorphosis (stage 4) had a lower growth rate than younger...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00514/62610/66974.pdf
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Recent changes in ichthyoplanktonic assemblages of the eastern English Channel ArchiMer
Di Pane, Julien; Koubbi, Philippe; Giraldo, Carolina; Lefebvre, Valerie; Caboche, Josselin; Marchal, Paul; Loots, Christophe.
ish assemblages vary through time in both abundance and diversity, often due to changes in climate. The potential consequences of these changes on the larval phase need to be considered. In the Eastern English Channel, fish larvae of 30 taxa, from surveys conducted during spring in the nineties and in 2017 with bongo nets, were used to investigate seasonal and interannual changes in larval assemblages with different statistical tests and multivariate analyses (Outlying Mean Index, Principal Coordinate Analysis and variance partitioning). The major change observed was significant lower abundances in 2017 (in April and May) compared to the nineties. Most of the dominant taxa were two to three-fold less abundant in 2017 than the 1990s. We suggest that the...
Tipo: Text Palavras-chave: Fish larvae; Temporal variations; Atlantic Multidecadal Oscillation; Outlying Mean Index; Variance partitioning; English Channel.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00604/71631/70078.pdf
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Technological Development and Fisheries Management ArchiMer
Eigaard, Ole Ritzau; Marchal, Paul; Gislason, Henrik; Rijnsdorp, Adriaan D..
Many marine fish stocks are overexploited and considerable overcapacity exists in fishing fleets worldwide. One of the reasons for the imbalance between resource availability and fishing capacity is technological development, which continuously increases the efficiency of the vessels—a mechanism referred to as “technological creep.” We review how the introduction of new and more efficient electronic equipment, gear design, engines, deck equipment, and catch-handling procedures influences the capture efficiency (catchability) of commercial fishing vessels. On average, we estimate that catchability increases by 3.2% per year due to technological developments, an increase often ignored in fisheries management. The documentation and quantification of...
Tipo: Text Palavras-chave: Catchability; Fishing mortality; Fishing power; Fisheries management; Fleet capacity; Technological development.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00222/33368/35784.pdf
Registros recuperados: 64
Primeira ... 1234 ... Última
 

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