Acoustic assessment and distribution of the main pelagic fish species in the ICES Subdivision IXa South during the ECOCADIZ 0813 Spanish survey (August 2013).
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Autor/esRamos, F. (Fernando); Iglesias, M. (Magdalena); Jiménez, M.P. (María Paz); Miquel-Batle, J. (Joan); Oñate-Garcimartín, D. (Dolores); Tornero, J. (Jorge); Ventero, A. (Ana); Díaz, N. (Nuria)
The present working document summarises the main results from the Spanish (pelagic ecosystem‐) acoustic survey conducted by IEO between 2nd and 13th August 2013 in the Portuguese and Spanish shelf waters (20‐200 m isobaths) off the Gulf of Cadiz onboard the R/V “Cornide de Saavedra”. The survey dates were somewhat delayed in relation to the usual ones and to the anchovy (Engraulis encrasicolus) peak spawning as well. 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. The bulk of the anchovy population was concentrated in the Spanish shelf, with a residual nucleus to the west of Cape Santa Maria. A delay of the usual survey dates may be the reason of a higher relative importance of smaller anchovies in the population as a ...
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