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We work with our Suppliers to improve the sustainability of our products from extractive fisheries and aquaculture, as well as from other sectors.
You can find more information at http://www.noticiasmercadona.es/politica-pesca-sostenible-mercadona/"
Regarding canned tuna:
100% of Hacendado's tuna is manufactured by suppliers that are committed to sustainability and preservation of tuna population. You can find more information at www.infosostenibilidaddelatun.org and in Greenpeace's 2015 tuna guide http://www.greenpeace.org/espana/es/Trabajamos-en/Defensa-de-los-oceanos/Atun/Guia-de-atun-2015/