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Registros recuperados: 105
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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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Amélioration de la sélectivité des chalutiers Pêcherie multispécifique – Manche - Mer du Nord (selecmer) ArchiMer
Leonardi, Sophie; Rubin, Alex; Meillat, Marc; Coppin, Franck; Delpech, Jean-paul; Morandeau, Fabien; Larnaud, Pascal.
Ce rapport fait la synthèse des travaux réalisés en 2008 et en 2009 au cours du programme Selecmer. Celui-ci, réalisé à l'initiative des professionnels de la pêche en partenariat avec l'Ifremer, avait pour objectif de travailler à améliorer la sélectivité du chalut de fond qu'ils utilisent afin de diminuer les rejets des individus hors-tailles1, en particulier pour le merlan, tout en limitant les pertes commerciales immédiates. Une première phase a consisté à tester l'efficacité de fenêtres à mailles carrées. La deuxième phase a eu pour objectif de développer une grille sélective. Des essais en bassin et des campagnes vidéo en mer ont permis d'apporter des ajustements aux dispositifs sélectifs. L'ensemble des essais de sélectivité à bord des navires de...
Tipo: Text Palavras-chave: Professional fishermen; Square mehs; Flume tank; Selective grid; North Sea; Channel; Bottom trawl; Selectivity; Fishing; Professionnels; Mailles carrées; Campagnes à la mer; Bassin d'essais; Grille sélective; Mer du Nord; Manche; Chalut de fond; Sélectivité; Pêche.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/rapport-6776.pdf
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An evaluation of multi-annual management strategies for ICES roundfish stocks ArchiMer
Kell, L; Pilling, G; Kirkwood, G; Pastoors, M; Mesnil, Benoit; Korsbrekke, K; Abaunza, P; Aps, R; Biseau, Alain; Kunzlik, P; Needle, C; Roel, B; Ulrich, Clara.
Current scientific management objectives for ICES roundfish stocks are to ensure conservation of the biological resource and do not explicitly consider economic or social objectives. For example, there are currently no objectives to maximize the sustainable yield or to reduce variability in total allowable catches (TACs). This is despite the fact that the current system can result in wide annual fluctuations in TAC, limiting the ability of the fishing industry to plan for the future. Therefore, this study evaluated management strategies that stabilized catches by setting bounds on the interannual variability in TACs. An integrated modelling framework was used, which simulated both the real and observed systems and the interactions between system...
Tipo: Text Palavras-chave: Whiting; TAC; Simulation; Saithe; Population modelling; North Sea; Management; Limiting variations; Harvest strategies; Hake; Haddock; Evaluation; Cod; Bounds.
Ano: 2006 URL: https://archimer.ifremer.fr/doc/2006/publication-3694.pdf
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Anchovy population expansion in the North Sea ArchiMer
Petitgas, Pierre; Alheit, Juergen; Peck, Myron A.; Raab, Kristina; Irigoien, Xabier; Huret, Martin; Van Der Kooij, Jeroen; Pohlmann, Thomas; Wagner, Carola; Zarraonaindia, Iratxe; Dickey-collas, Mark.
The abundance and spatial occupation of European anchovy Engraulis encrasicolus have increased in the North Sea since the mid-1990s. We use a cross-disciplinary approach combining genetics, transport modelling, survey time series analyses and physical oceanographic modelling to investigate 3 hypotheses on the reasons for this change. Evidence from connectivity studies suggests that the population of North Sea anchovy is separate from that in the Bay of Biscay. The recruitment pulses observed in survey data fit a life cycle which includes spawning in early summer and larval development in late summer. This also supports the concept of population expansion originating from local remnant population(s). In terms of growth physiology, suitable thermal windows...
Tipo: Text Palavras-chave: Climate variability; Small pelagic fish; Regime shift; Temperature; Anchovy; North Sea.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00060/17140/14638.pdf
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Area-based management and fishing efficiency ArchiMer
Marchal, Paul; Ulrich, Clara; Pastoors, M.
The scope of this study is to investigate the extent to which area-based management may have influenced the fishing efficiency of the Danish and Dutch demersal fleets harvesting cod, plaice and sole in the North Sea. Special consideration is given to the 'plaice box', a restricted area where fishing is prohibited to towed-gear fleets of horsepower exceeding 300 hp. An index of fishing power is calculated as the log-ratio between the catch per unit effort (CPUE) of any vessel and some survey abundance index. Annual trends in fishing are calculated as the year-effect derived from a general linear model (GLM) analysis of the index of fishing power. The fishing efficiency of Danish gill-netters and, to some extent, Danish seiners, has overall increased inside...
Tipo: Text Palavras-chave: Fishing efficiency; Plaice box; Fisheries management; North Sea; Demersal fisheries.
Ano: 2002 URL: https://archimer.ifremer.fr/doc/00589/70118/68112.pdf
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Assessment of contaminant concentrations in sediments, fish and mussels sampled from the North Atlantic and European regional seas within the ICON project ArchiMer
Robinson, Craig D.; Webster, Lynda; Martinez-gomez, Concepcion; Burgeot, Thierry; Gubbins, Matthew J.; Thain, John E.; Vethaak, A. Dick; Mcintosh, Alistair D.; Hylland, Ketil.
Understanding the status of contaminants in the marine environment is a requirement of European Union Directives and the Regional Seas Conventions, so that measures to reduce pollution can be identified and their efficacy assessed. The international ICON workshop (Hylland et al., in this issue) was developed in order to test an integrated approach to assessing both contaminant concentrations and their effects. This paper describes and assesses the concentrations of trace metals, polycyclic aromatic hydrocarbons, and polychlorinated biphenyls in sediments, mussels, and fish collected from estuarine, coastal and offshore waters from Iceland to the Mediterranean Sea. For organic contaminants, concentrations progressively increased from Iceland, to the...
Tipo: Text Palavras-chave: Integrated assessment; ICES; North Atlantic; North Sea; Baltic Sea; Mediterranean Sea; Polycyclic aromatic hydrocarbons (PAHs); Polychlorinated biphenyls (PCBs); Trace metals; Environmental monitoring.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00324/43520/43051.pdf
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Benthic communities in the Southern Bight of the North Sea and their use in ecological monitoring OMA
Govaere, J.C.R.; Van Damme, D.; Heip, C.H.R.; De Coninck, L.A.P..
Macrobenthic and meiobenthic communities of an area off the Belgian coast of the North Sea were studied from 1970 until 1975 at 74 stations. On the basis of both macro- and meiobenthos, three zones can be distinguished in the area. The coastal zone is characterized by the macrobenthic <i>Abra alba</i> community, corresponding to the meiobenthic <i>Microarthridion littorale</i>-<i>Halectinosoma herdmani</i> community, and the open sea zone by the macrobenthic <i>Venus gallina</i> community and the meiobenthic <i>Leptastacus laticaudatus-Paramesochra helgolandica</i> community. In between is a transient zone where elements of both other zones mix. The distribution of these zones is governed by the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthos Abra alba (W. Wood; 1802) [White furrow shell] Molluscs ANE; Belgium ANE; North Sea; Southern Bight.
Ano: 1980 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3661
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Benthos of a sublittoral sandbank in the Southern Bight of the North Sea: general considerations OMA
Willems, K.A.; Vanosmael, C.; Claeys, D.; Vincx, M.; Heip, C.H.R..
The benthic fauna of the Kwinte Bank, a linear sandbank in the Belgian coastal waters of the North Sea, was sampled on ten stations in September 1978. This sandbank shows a linear gradient from fine sandy sediments in the south to coarser sandy sediments in the north as a result of the tidal current pattern in the region. The influence of this gradient on macro- and meiofauna was studied. Diversity of polychaetes and harpacticoid copepods is correlated with median grain size of the sand fraction, diversity of nematodes is not. The influence of station location and sediment characteristics on density of all major macrobenthic groups is very outspoken, and linear density trends are common. This is not true for meiofauna in general and nematodes and copepods...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthos Sand banks ANE; Belgium; Flemish Banks; Kwinte Bank ANE; North Sea; Southern Bight.
Ano: 1982 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3393
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Cetaceans stranded in the Netherlands from 1998 to 2007 Naturalis
Camphuysen, C.J.; Smeenk, C.; Addink, M.; Jansen, O.E..
Between 1998 and 2007, 2063 cetaceans were found stranded in the Netherlands, representing at least 14 species. Two species, humpback whale (Megaptera novaeangliae) and Blainville’s beaked whale (Mesoplodon densirostris), are additions to the Dutch list. Apart from the first humpback whales, relatively many balaenopterid whales were found in comparison with previous decades. Range extension of recovering populations may explain part of this trend. However, the decline in strandings frequency in sperm whales (Physeter macrocephalus), another species with a slowly recovering Atlantic population but with a distinct peak in strandings in the 1990s, suggests that the factors underlying these changes are complex. During the 20th century, the strandings frequency...
Tipo: Article / Letter to the editor Palavras-chave: Cetaceans; Strandings; The Netherlands; North Sea; Wadden Sea; Fin whale; Sei whale; Minke whale; Humpback; 42.84.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/328649
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Delineating recurrent fish spawning habitats in the North Sea ArchiMer
Lelievre, Stephanie; Vaz, Sandrine; Martin, C. S.; Loots, Christophe.
The functional value of spawning habitats makes them critically important for the completion of fish life cycles and spawning grounds are now considered to be “essential habitats”. Inter-annual fluctuations in spawning ground distributions of dab (Limanda Limanda), plaice (Pleuronectes platessa), cod (Gadus morhua) and whiting (Merlangius merlangus) were investigated in the southern North Sea and eastern English Channel, from 2006 to 2009. The preferential spawning habitats of these species were modelled using generalised linear models, with egg distribution being used as proxy of spawners’ location. Egg spatial and temporal distributions were explored based on six environmental variables: sea surface temperature and salinity, chlorophyll a concentration,...
Tipo: Text Palavras-chave: Egg Distribution; Spawning Grounds; North Sea; Temporal Variability; Habitat Modelling; GLM.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00185/29674/28046.pdf
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Deposition of atmospheric trace elements into the North Sea: coastal, ship, platform measurements and model predictions OMA
Injuk, J.; Van Grieken, R.; De Leeuw, G..
The atmospheric input of up to 16 trace and other elements into the North Sea is further assessed from aerosol concentrations measured at a coastal station in Belgium, on ships during two cruises, and on a platform, in the years 1992-1994. The Slinn and Slinn model is used to calculate the dry deposition from the measured aerosol concentrations. The total (dry and wet) deposition into the North Sea environment is estimated to be (in tonnes per year): 560 for V, 1300 for Cr, 650 for Ni, 690 for Cu, 3500 for Zn and 1970 for Pb. The 'giant' particles dominate the fluxes. The atmospheric contribution to the total input into the North Sea, including riverine inputs and direct discharges, are estimated to be 28% for Cu, 29% for Zn and 57% for Pb. The inputs...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aerosols Experimental data Fallout Heavy metals Measurement Modelling ANE; North Sea.
Ano: 1998 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=309
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Diurnal variations in CPUE and length composition of the catches in a <i>Nephrops</i> directed fishery in the Central North Sea OMA
Redant, F.; De Clerck, R..
The report describes the Belgian <i>Nephrops</i> directed fishery in the Central North Sea (Botney Gut-Silver Pit area) and analyzes the diurnal variations in CPUE and catch composition of several commercial <i>Nephrops</i> trawlers operating in this area. Peak CPUE-values were generally obtained after dawn and before dusk. Some anomalies however did occur. These are discussed in relation to the natural variations in light intensity on the sea floor and the food requirements of <i>Nephrops</i>. There was no evidence of significant changes in the length composition of <i>Nephros</i> taken at different times of the day. The data even suggest that all size groups of <i>Nephros</i> respond in the same...
Tipo: Info:eu-repo/semantics/book Palavras-chave: Circadian rhythms Length Nephrops ANE; Belgium ANE; North Sea.
Ano: 1984 URL: http://www.vliz.be/imisdocs/publications/129008.pdf
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Dynamic patterns of dissolved nitrogen in the Southern Bight of the North Sea OMA
Baeyens, W.F.J.; Mommaerts, J.-P.; Goeyens, L.; Dehairs, F.A.; Dedeurwaerder, H.; Decadt, G..
Spatial and temporal variations of dissolved inorganic nitrogen (DIN) have been assessed in onshore and offshore areas of the Southern Bight on the basis of several years' measurements. They indicate that both the residual flow lines and DIN isoconcentration lines run parallel with the coast except in the vicinity of important freshwater discharge points such as the Scheldt estuary. Evidence was found that the seasonal DIN oscillations are not created through fluctuations in input conditions at the lateral boundaries, despite considerable fluctuations in these inputs which include the English Channel (from 500 tons(t) N day<sup>-1</sup> in June up to approximately 2000 t N day<sup>-1</sup> in February) and also rivers such as the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dissolved organic nitrogen ANE; North Sea; Southern Bight.
Ano: 1984 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3310
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Ecological modelling of the North Sea OMA
Fransz, H.G.; Mommaerts, J.-P.; Radach, G..
North Sea ecosystem models published in accessible literature are partitioned into groups with respect to their emphasis on significance and detail of different trophic levels of the ecosystem. These subsets are treated separately in the three main chapters, which deal with relationships with physical dynamics, lower trophic level interactions and higher trophic level interactions. They are preceded by chapters that introduce the scope of the models, the history of modelling approaches, main purposes and specific aims, general aspects of internal structure, and modelling techniques applied. The main chapters compare the process descriptions characteristic of the subsets of models, and discuss aims and results with emphasis on significance and contribution...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthos Ecosystem management Environmental effects Marine environment Models Nutrient cycles Plankton Predation Primary production Trophodynamic cycle ANE; North Sea.
Ano: 1991 URL: http://www.vliz.be/imisdocs/publications/262355.pdf
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Effects of alkaline aluminate waste dumping on seawater chemistry OMA
Vandelannoote, R.; Van 't Dack, L.; Van Grieken, R..
The alkaline aluminate waste, of which 1000-2000 tonnes are dumped a few times a year off the Belgian coast in the Southern Bight of the North Sea, contains 5.4% NaCl, 1.8% dissolved Al and 7.4% NaOH, in addition to traces of heavy metals and some aniline- and phenol-derivatives. The pH rises locally to 8.5 and the total Al-concentration reaches 120 mg liter<sup>-1</sup> (corresponding to an initial waste dilution factor of only 150) in the 10-m wide track just beyond the discharging barge, but these decay quickly to pH 8.1 and 1 mg liter<sup>-1</sup> in the 30-m wide track, 500m behind the barge. The relation between the waste concentration and seawater pH was studied. The white precipitate that forms immediately in the sea was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Alkalinity Aluminium Chemical oceanography Ocean dumping Pollution monitoring Waste disposal ANE; Belgium ANE; North Sea; Southern Bight.
Ano: 1987 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3211
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Effects of titanium dioxide industry waste dumping on sea water chemistry OMA
Roekens, E.J.; Van Grieken, R.E..
An investigation was made to determine the influence of the dumping of a 1000 ton day<sup>-1</sup>, on the average, of acid-iron waste from the titanium dioxide industry into the shallow but turbulent Southern Bight of the North Sea. This waste contains some 20% sulphuric acid and 2% iron. After the passage of the barge that discharges 10 ton of waste min<sup>-1</sup> into its wake, the vertical and horizontal distributions of the pH, iron-concentrations and turbidity were measured as a function of time. It appeared that a few seconds after the discharge and for a very brief period, the pH was down to approx. 4 and the Fe-concentration was 13 mg l<sup>-1</sup>. More than 1 min after the discharge a pH below 6 and an...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dumping Marine chemistry Titanium compounds ANE; North Sea; Southern Bight.
Ano: 1983 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3292
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Epibenthos OMA
Redant, F..
Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthos Check lists Molluscs ANE; Belgium ANE; North Sea; Southern Bight.
Ano: 1976 URL: http://www.vliz.be/imisdocs/publications/288150.pdf
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Estimates of dry and wet deposition and resuspension fluxes of several trace metals in the Southern Bight of the North Sea OMA
Dedeurwaerder, H.L.; Dehairs, F.A.; Decadt, G.; Baeyens, W.F.J..
In this study we have investigated air-sea exchanges in the Belgian coastal area located in the Southern Bight of the North Sea. Since 1980 the tropospheric aerosol contents for the trace elements Cd, Cu, Mn, Pb, Zn and for the reference elements Al , Fe, Na have been monitored on an intermittent basis from a maritime sampling platform (Light-Vessel West-Hinder; position: 51°23.5'N- 2°21.5'E, fig. 1). During 1981 sampling campaigns at sea were paralleled by sampling campaigns on land, in the coastal area (natural reserve De Blankaert, located at 20 Km inland), in order to allow for a better evaluation of the specific source or sink role of the sea. No major source of pollution exists between the maritime and the continental sampling sites. During these...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aeolian deposits Resuspension Trace metals ANE; North Sea; Southern Bight.
Ano: 1984 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3323
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Estimating stock parameters from trawl cpue-at-age series using year-class curves ArchiMer
Cotter, A; Mesnil, Benoit; Piet, G.
A year-class curve is a plot of log cpue (catch per unit effort) over age for a single year class of a species (in contrast to the better known catch curve, fitted to multiple year classes at one time). When linear, the intercept and slope estimate the log cpue at age 0 and the average rate of total mortality, Z, respectively. Here, we suggest methodological refinements within a linear least squares framework. Candidate models may include a selectivity term, fleet-specific parameters, and polynomials in year to allow for gradual variations of Z. An iterative weighting method allows for differing precisions among the different fleets, and a forward (one-step ahead) validation procedure tests predicted cpue against observed values. Choice of the best...
Tipo: Text Palavras-chave: Year class curve; Plaice; North Sea; Iteratively weighted least squares; Forward validation; Fish stock assessment; Cpue; Analysis of relative residual variance.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2776.pdf
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Evidence of a relationship between weight and total length of marine fish in the North-eastern Atlantic Ocean: physiological, spatial and temporal variations ArchiMer
Mahe, Kelig; Bellamy, Elise; Delpech, Jean-paul; Lazard, Coline; Salaun, Michele; Verin, Yves; Coppin, Franck; Travers-trolet, Morgane.
Weight–Body Length relationships (WLR) of 45 fish species (37 Actinopterygii and eight Elasmobranchii) were investigated. A total of 31,167 individuals were caught and their biological parameters measured during the four quarters from 2013 to 2015, on five scientific surveys sampling the North-eastern Atlantic Ocean from the North Sea to the Bay of Biscay (ICES Divisions IVb, IVc, VIId, VIIe, VIIg, VIIh, VIIj, VIIIa and VIIIb). Among 45 tested species, all showed a significant correlation between total length (L) and total weight (W). The influence of sex on WLR was estimated for 39 species and presented a significant sexual dimorphism for 18 species. Condition factor (K) of females was always higher than for males. Moreover, a spatial effect on the WLR...
Tipo: Text Palavras-chave: Weight-length relationship; Condition factor; Bay of Biscay; Celtic Sea; English Channel; North Sea; Sexual dimorphism; Seasonality.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00363/47418/47513.pdf
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