Acoustic assessment and distribution of the main pelagic fish species in the ICES Subdivision IXa during the ECOCÁDIZ 0710 Spanish survey (July 2010).
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AuthorsRamos, F. (Fernando); Iglesias, M.; Miquel-Batle, J. (Joan); Oñate-Garcimartín, D. (Dolores); Tornero, J. (Jorge); Ventero, A. (Ana)
The present working document summarises the main results from the Spanish acoustic (pelagic ecosystem‐) survey conducted by IEO between 25th July and 1st August 2010 in the Portuguese (but with an incomplete coverage) and Spanish shelf waters (20‐200 m isobaths) off the Gulf of Cadiz onboard the R/V “Cornide de aavedra”. The survey season was coincident with the anchovy (Engraulis encrasicolus) peak spawning to achieve an acoustic estimate of its SSB in the study area as well. This year the surveyed area was reduced to an area limited by the waters placed between Cape Trafalgar and Cape Santa Maria. Abundance and biomass estimates are given for all the mid‐sized and small pelagic fish species susceptible of being acoustically assessed according to their occurrence and abundance levels in the study area. The distribution of these species is also shown from the mapping of their back‐scattering energies. In the sampled area, anchovy was distributed all over the shelf of the ...