Acoustic abundance estimation of pilchard (Sardina pilchardus Walb.) in Galician and Cantabric waters. August 1983

Results of the acoustic survey "Saracus-83" are reported in this paper. This cruise was carried out on board the research vessel "Cornide de Saavedra", in august 1983 off the Cantabric and Galician coasts in the north of Spain. The main objective of the survey was to estimate the abundance by age groups of pilchard (Sardina pilchardus Walb.) present in the area, being this population apart of the stock wich is considered to exist in the ICES divisions VIIlc and IXa. The total estimated biomass for pilchard was 697000 tons. The area of higher abundance was northern Galicia, between Ribadeo and Finisterre, that coincides with the upwelling area described.On presente ici les resultats de la campagne acoustique realisée par le B/R "Cornide de Saavedra" dans Aout 1983 au large des côtes Cantabrique et Galicienne du N et NW espagnol. Le but de cette campagne a été l'estimation de l'abondance par classe d'age de la sardine (Sardina pilchardus Walb.) dans l'aire prospectée qui appartient aux divisions VIIIc et IXa du ICES. La plus grande abondance a été la partie nord de la Galicie, entre Ribadeo et Finisterre, qui coincide avec la zone de "upwel1ing" deja signalée