This study involves the determination of mucous histochemistry at various regions of the alimentary canal of the Scardinius erythrophtholmus using light microscopy. Histochemical analysis showed that the gastrointestinal mucous content included sulphate-esters and/or carboxylic [Alcian blue (AB) pH 2.5 +], glycogen and/or oxidable dioles [periodic acid/Schiff+ (PAS+)], neutral or acid-rich (PAS/AB pH 2.5+) and strong acid sulphated [(AF+) (AF/AB pH 2.5+)] glycoproteins (GPs). But, in stomach and anterior intestine epithelium sulphated glycoproteins were not observed. As a result of the content of the glycoprotein was found to be more neutral property.