Each team has a park manager who organizes the work to be performed in each set, record the total c

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One of the main tasks of the study of populations of commercial fish is getting the proper management of fishery resources. Sometimes major league fishing that management is done from the data provided by the fishing sector itself (catch, effort, etc..), But these can present major league fishing problems of inaccuracy (eg undeclared data) or bias by the very nature of the activity. Therefore fisheries research campaigns represent an alternative data source, more reliable, which is used in addition to official statistics. We recently participated in the annual campaigns (3NO, Flemish Cap, and 3L, see map) conducted by the IEO and the IIM-CSIC in northeast Atlantic waters and financed by the EU. Specifically conducted trawling campaigns aimed at the evaluation of fishery resources in the NAFO Regulatory Area (Northwest Atlantic Fisheries Organization).
In the framework of the EU, the aim of these campaigns is defined by Regulation (EC) No 199/2008 (25/2/2008) on the establishment of a Community major league fishing framework for the collection, management and use of data from the fisheries sector and support for scientific advice (which plays a key role the International Council for the Exploration of the Sea, ICES) in relation to the Common Fisheries Policy (CFP). It specifically states in Article major league fishing 12 that Member States carry out research surveys at sea to evaluate major league fishing the abundance and distribution of populations regardless of the data provided by commercial fishing.
Summarizing, we can say that the primary goal of these campaigns is to estimate indices of abundance and biomass of the species studied major league fishing independently major league fishing of fisheries statistics. You have to add the objective knowledge of the population structure and estimation of certain biological parameters (growth and reproduction) of their populations. In addition, as part of the Ecosystem Approach to Fisheries Mangement, have been integrating new objectives to the need for data to feed ecosystem models, such as: character studies hydrographic major league fishing (temperature and salinity) and networking trophic (food ).
The sampling methodology consists of a stratified random sample approved by NAFO and described in detail in Doubleday (1981, pdf available at: Doubleday, WG, ed. Manual major league fishing on groundfish surveys in the Northwest Atlantic. Northwest Atlantic Fisheries Organization, 1981), reaching depths of up to 1500 m. The strata are the result of the combination of depth limits and certain geographic areas. Within each stratum are distributed grids representing fishing stations, chosen at random and proportional to the area of each stratum (between 2 and 20 grids per stratum). The abundance and biomass estimates are based on the swept area method, based on the effective area of trawl gear.
The vessel used for such campaigns in the NAFO area is the Vizconde de Eza. The work done on board consists mainly in identifying the species (both fish and invertebrates), direct quantification or by extrapolation of the same, and biological sampling of those most relevant from a business perspective or abundance.
The scientific team integrates a campaign manager, a responsible person and recorded CTD data collected during the campaign, and twelve scientists assigned to the fishing park. These latter are divided major league fishing into two teams of five people for the grading and sampling of catches.
Each team has a park manager who organizes the work to be performed in each set, record the total catch of each species, and review summary reports major league fishing before handing the campaign manager. Another person does the sampling of invertebrates, as well as collaborating in the sampling of catches. The data collected include: the characteristics of each haul made, catches, sizes and biological sampling, analysis of stomach contents (if any), the collection of frozen or fixed samples, and purely hydrographic data obtained with CTD.
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