Catálogo de datos del IEO
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4301 record(s)
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A circumnavigation oceanographic expedition to generate a high resolution inventory of global change impact on the ecosystem of the ocean, researching its biodiversity in the deep.
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The survey in Div. 3NO of NAFO Regulatory Area was initiated by Spain in 1995. Until 2001, the survey was carried out in spring (May), on board the Spanish vessel C/V Playa de Mendui??a (338 GT and 800 HP) using bottom trawl net type Pedreira. Since 2001, the R/V Vizconde de Eza replaced the C/V Playa de Mendu????a as the research vessel for the survey, and Campelen net replaced Pedreira net as survey gear. The main objectives of this survey time series are: a) to obtain abundance indices of the main exploited species, b) to study the structure and distribution of these demersal species in the area.
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Evaluation of the sea floor by indirect and direct methods.
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Abundance indices, distribution patterns and faunal assemblages of demersal species in the Porcupine bank, together with the possible driving factors of their distribution. This survey belongs to the research project: ?Evaluacion de Recursos Demersales por Metodos Directos en el Area ICES?. This Project is partly funded by the DCR of the EU and the Education and Science Spanish Ministery.The main objectives of the above mentioned project related with this survey time series are: a) to obtain abundance indices of the main exploited species in the Porcupine bank; b) to estimate the strength of yearly recruitments of these species and their distribution in the bank. c) to study the structure and distribution o the demersal and benthic communities in the area.
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Identifying possible bioconstructions and other geo-morphological structures of interest. Biological fish studies and hidrographic sampling (CTD) over the seamounts
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The main objective of this series of individual cruises is to produce both an index and a direct estimate of the biomass of the north east Atlantic mackerel stock and an index for the southern and western horse mackerel stocks. The general method is to quantify the freshly spawned eggs in the water column on the spawning grounds, report egg species identification and staging. To be able to establish a relationship between eggs and biomass of the spawning stock, the fecundity of the females must also be determined. The realised fecundity is used in combination with the calculated number of freshly spawned eggs in the water to render an estimate of the spawning stock biomass. To provide reliable estimates of the quantity of spawned eggs and the fecundity an extensive coverage of the spawning area is required both in time and space. Provide temperature data from the CTD casts will be used for the egg ageing procedure. Other environmental variables will be used for hydrographic and spawning area characterization.
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The main objective is the collection of data that allow estimate the abundance, biomass and demographic structure of the species of commercial interest in the regulation area NAFO, until a maximum depth of 1500 m.
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Evaluation of the sea floor by indirect and direct methods.
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This survey covers the international NAFO Regulation Area in divisions 3NO. It started in 1995 with the only purpose of collecting data for stock assessment of target species down to 700 m, but its aims and research area have widened with time. Currrently, the survey covers a depth range of 50-1500 m and its goals are the following: 1.Regarding the target species (Hippoglossoides platessoides, Limanda ferruginea, Reinhardtius hippoglossoides, Glyptocephalus cynoglossus, Gadus morhua, Sebastes sp, Macrourus berglax, Centroscyllium fabricii and Raja radiata) and other species of commercial interest (Urophycis tenuis; Pandalus borealis) : a) to obtain biomass and abundance indexes b) to estimate recruitment, c) to investigate the population structure To achieve this, biological information (length, weight, sex, maturity, stomach contents) is obtained from about 30 species, as well as otoliths and gonads from cod, Greenland halibut and roughead grenadier. The remaining fish and commercial invertebrate species are length measured and weighted. 2..Collection of oceanographic data (temperature, salinity, oxygen and fluorescence); 3.Invertebrate data collection: all species are identified to the maximum possible level on board, or otherwise photographed and preserved for later examination at the lab, counted and weighted, with the aim of investigating the benthic invertebrate faunal assemblage and presence of vulnerable species.
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The surveys on NAFO Regulatory Area of Div. 3L (Flemish Pass) were initiated by Spain in 2003. The surveys were carried out by the R/V ¿Vizconde de Eza¿ following the same procedures and using the same bottom trawl net type Campelen. The main objectives of this survey time series are: a) to obtain abundance indices of the main exploited species, b) to study the structure and distribution of these demersal species in the area.