Manetta, G.L. Benedito, E. Ducatti, C. Effect of alcohol and formaldehyde on the C and N isotopica composition of Plagioscio squamosissimus and Hypophhthalmus edentatus (Pisces, Osteichthyes) Subjects--Topical Terms: PLAGIOSCION SQUAMOSISSIMUSPESCADA DO PIAUÍISÓTOPOPEIXE DE ÁGUA DOCE