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Registros recuperados: 28
Primeira ... 12 ... Última
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Projected impacts of warming seas on commercially fished species at a biogeographic boundary of the European continental shelf ArchiMer
Maltby, Katherine M.; Rutterford, Louise A.; Tinker, Jonathan; Genner, Martin J.; Simpson, Stephen D.; Punt, Andre.
Projecting the future effects of climate change on marine fished populations can help prepare the fishing industry and management systems for resulting ecological, social and economic changes. Generating projections using multiple climate scenarios can provide valuable insights for fisheries stakeholders regarding uncertainty arising from future climate data. Using a range of climate projections based on the Intergovernmental Panel on Climate Change A1B, RCP4.5 and RCP8.5 climate scenarios, we modelled abundance of eight commercially important bottom dwelling fish species across the Celtic Sea, English Channel and southern North Sea through the 21st century. This region spans a faunal boundary between cooler northern waters and warmer southern waters,...
Tipo: Text Palavras-chave: Celtic Sea; Climate change; English Channel; Fish; Fisheries; North Sea; Regional projections; Uncertainty.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00643/75490/76341.pdf
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Estimation des rejets de peche des chalutiers français en mer Celtique ArchiMer
Rochet, Marie-joelle; Trenkel, Verena; Peronnet, Isabelle.
Discards of the French trawler fleet operating in the Celtic Sea in 1997 were studied. Twenty-six trips, representing 0.8% of the total fishing effort, were sampled. This fleet consists of three métiers, benthic trawlers, demersal trawlers and Nephrops trawlers. The fleet discarded an estimated 30,000 tons of animals in 1997, while landing 63,000 tons. The total quantity discarded did not differ among métiers, but the species composition of discards did. Benthic trawlers discarded mainly by-catch species, whereas demersal and Nephrops trawlers discarded primarily their target species. Whiting, megrim, Nephrops and hake were discarded in larger numbers than landed. Hence discards should probably be taken into account in catch-based assessments. However,...
Tipo: Text Palavras-chave: Espèce non commerciale; Langoustine; Baudroie; Poisson plat; Gadidé; Mer celtique; Echantillonnage des rejets; Non commercial species; Nephrop; Anglerfish; Flatfish; Gadoid; Trawler; Celtic Sea; Discard sampling.
Ano: 2001 URL: https://archimer.ifremer.fr/doc/2001/rapport-1575.pdf
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Trophic models: What do we learn about Celtic Sea and Bay of Biscay ecosystems? ArchiMer
Moullec, Fabien; Gascuel, Didier; Bentorcha, Karim; Guenette, Sylvie; Robert, Marianne.
Trophic models are key tools to go beyond the single-species approaches used in stock assessments to adopt a more holistic view and implement the Ecosystem Approach to Fisheries Management (EAFM). This study aims to: (i) analyse the trophic functioning of the Celtic Sea and the Bay of Biscay, (ii) investigate ecosystem changes over the 1980–2013 period and, (iii) explore the response to management measures at the food web scale. Ecopath models were built for each ecosystem for years 1980 and 2013, and Ecosim models were fitted to time series data of biomass and catches. EcoTroph diagnosis showed that in both ecosystems, fishing pressure focuses on high trophic levels (TLs) and, to a lesser extent, on intermediate TLs. However, the interplay between local...
Tipo: Text Palavras-chave: Ecosystem Approach to Fisheries Management (EAFM); Bay of Biscay; Celtic Sea; Ecopath with Ecosim; EcoTroph; Trophic indicators.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00377/48771/49169.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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Concentrations of mercury and other trace elements in two offshore skates: sandy ray Leucoraja circularis and shagreen ray L. fullonica ArchiMer
Nicolaus, E. E. Manuel; Barry, Jon; Bolam, Thi P. C.; Lorance, Pascal; Marandel, Florianne; Phillips, Sophy R. Mccully; Neville, Suzanna; Ellis, Jim R..
Trace metal concentrations in muscle and liver tissues from two offshore species of skate were examined. Concentrations of mercury in muscle of Leucoraja circularis (n = 20; 23–110.5 cm total length, 157–490 m water depth) and L. fullonica (n = 24; 28.5–100 cm total length, 130–426 m water depth) were 0.02–1.8 and 0.04–0.61 mg kg− 1, respectively. Concentrations of both As and Hg increased with total length. Only the largest specimen had a concentration of Hg in muscle > 1.0 mg kg− 1. Data were limited for specimens > 90 cm long, and further studies on contaminants in larger-bodied skates could usefully be undertaken.
Tipo: Text Palavras-chave: Trace metals; Sandy ray; Shagreen ray; Bay of Biscay; Celtic Sea.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00397/50829/51592.pdf
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Exploring the impacts of fishing and environment on the Celtic Sea ecosystem since 1950 ArchiMer
Hernvann, Pierre-yves; Gascuel, Didier.
Analyzing the long-term changes in ecosystems and disentangling the influence of overfishing and environment require historical data integration. Fisheries-independent data are available only since the mid-1980s in the Celtic Sea and thus provide a short-term and truncated vision of fishing impacts. We conducted a catch-based study over the 1950–2015 period. We successively (i) reconstituted catch time-series, including unreported catch estimates, and studied them through a trophic-spectrum approach and ecosystem indicators based on trophic level, size and species diversity; (ii) estimated biomass trends of the main Celtic Sea target species from catch and effort time-series, using production models that detect potential shifts in productivity; and (iii)...
Tipo: Text Palavras-chave: Fishing impact; Celtic Sea; Catch reconstruction; Biomass production model; Ecosystem regime shifts; Trophic cascade; Fish productivity.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00600/71241/73090.pdf
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Disentangling the effects of capture efficiency and population abundance on catch data using random effects models ArchiMer
Trenkel, Verena; Skaug, Hans.
We propose a random effects model for disentangling population abundance and capture efficiency effects on bottom-trawl catches. The spatial distribution of individual fish is assumed random leading to a Poisson distribution for the number of individuals in the trawl path (no schooling). Capture efficiency, i.e. the proportion of individuals in the trawl path being retained by the gear, is modelled as a random variable. We propose model extensions that include the effects of body size on haul efficiency. We applied the models to several species from the Celtic Sea groundfish community based on small-scale repetitive hauls. The resulting abundance estimates allowed us to study population abundance ratios; the estimated capture efficiencies were comparable...
Tipo: Text Palavras-chave: Trawl survey; Poisson distribution; Celtic Sea; Catchability; Abundance.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-828.pdf
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Does diet in Celtic Sea fishes reflect prey availability? ArchiMer
Pinnegar, J; Trenkel, Verena; Tidd, A; Dawson, W; Du Buit, M.
Feeding preferences of Celtic Sea fishes were investigated using a database of stomach content records, collected between 1977 and 1994. The diet of cod Gadus morhua, hake Merluccius merluccius, megrim Lepidorhombus whiffiagonis, whiting Merlangius merlangus and saithe Pollachius virens changed markedly as the animals grew larger, and although large predators generally chose larger bodied prey, the variability of prey sizes consumed also increased. Large predators continued to select small, low value, benthic prey (e.g. Callionymus spp. and Trisopterus spp.) which were easier to catch, rather than larger, more energy lucrative pelagic prey (e.g. mackerel Scomber scombrus), even though these pelagic prey-fishes were nearly always available and were often...
Tipo: Text Palavras-chave: Stomach contents; Preference; Diet; Celtic Sea; Availability.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/publication-607.pdf
Registros recuperados: 28
Primeira ... 12 ... Última
 

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