The characteristics of glycoconjugates in the mucous cells of the Aphanius sureyanus (Neu, 1937) gill were investigated histochemica lly with the help of conventional methods. It was determined that Mucous cells ,which existed in the gill arch and primary filament epithelium contained acidic, neutral glycoconjugates, sialic acid residues and sulphated glycoconjugates and also AB pH 2.5 positive glycoconjugates were dominant in staining procedures of PAS/ AB pH 2.5 and AF/ AB pH 2.5 . It was detected that mucous cells of secondary lamellae did not contain any glycoconjugates (acidic, neutral, sialic acid residues, sulphated, very sulphated and O- sulphate esters glycoconjugates).The characteristics of glycoconjugates in the mucous cells of the Aphanius sureyanus (Neu, 1937) gill were investigated histochemica lly with the help of conventional methods. It was determined that Mucous cells ,which existed in the gill arch and primary filament epithelium contained acidic, neutral glycoconjugates, sialic acid residues and sulphated glycoconjugates and also AB pH 2.5 positive glycoconjugates were dominant in staining procedures of PAS/ AB pH 2.5 and AF/ AB pH 2.5 . It was detected that mucous cells of secondary lamellae did not contain any glycoconjugates (acidic, neutral, sialic acid residues, sulphated, very sulphated and O- sulphate esters glycoconjugates).