LEBA_MEDITS22_GSA05_Pitiuses_181022

Description

This is the representation of the spatial distribution of sampling transects with experimental trawl GOC-73 carried out during the MEDITS 2022 GSA05 campaign in Pitiüses (Ibiza and Formentera) on board the B/O Miguel Oliver. This is the first time that the MEDITS series of oceanographic campaigns also covers the islands of Ibiza and Formentera. The transects correspond to the 38 sampling stations of the camapaña MEDITS GSA05 in sedimentary bottoms of the continental shelf and slope (trawl fleet fishing grounds) between 50 and 800 m deep . The sampling strategy is of the stratified random type with geographical sectors identified based on the geographical sub-areas of the General Fisheries Commission for the Mediterranean and in the Balearic Islands four depth strata: 51-100, 101-200, 20-500 and 501-800 m. The sampler used is the bottom trawl GOC-73, designed specifically for this sampling programme (Fiorentini et al., 1999; Dremiere et al., 1999). It is an experimental gear of reduced dimensions (16-18 m of horizontal opening and 2.7-3.2 m of vertical opening) and with a cod-end of rhombic mesh of 20 mm. The effective duration of sampling, since the gear reaches the bottom, is 30 and 60’ for samples at <200 and >200 m depth, respectively, and the trawl speed of 2.7-3.0 knots. It is a data set composed of linear elements, where each element represents the path of the sampling transect from the starting point (when the gear reaches the bottom) and to the turning point. Each object is associated with a series of alphanumeric variables such as background and turn coordinates, depth, date and time of sampling, duration, distance traveled and area swept, among other variables. Sampling station data (positions, depth and speed), as well as species list, size distribution and biological data of the species caught, are recorded on board and computerised into five types of files used to store and exchange MEDITS data: TA, TB , TC, TE and TL. For more details: http://www.sibm.it/MEDITS%202011/principale%20project.htm. The elaboration of this set of geographical information for the Balearic Islands began in 2001, thanks to the BALAR and MEDITS oceanographic campaigns, although 2021 has been the first year in which the sedimentary bottoms of the continental shelf and the upper and middle slope of Ibiza and Formentera have also been sampled.

Resources

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Tags

  • peces-y-cefalopodos
  • muestreo
  • estrategias-marinas
  • demarcación-marina-leba
  • msfd
  • biodiversidad
  • directive-2008-56-ec
  • transectos-arrastre
  • estaciones-muestreo-medits
  • medits-gsa05

Topics

  • ENVI
  • TECH

Categories