2011/1/1/ · Ecological engineering: from concepts to applications Composting fish waste and seaweed to produce a fertilizer for use in organic agriculture Maria Elvira López-Mosqueraª , *, Emilio Fernández-Lema a , Rubén Villares a , Rafael Corral b , Begoña Alonso b , Concepción Blanco b a Escola Politécnica Superior.