Zbanyszek R., 1975. The effect of sulphates and phosphates (industrial wastes) on the mucopolysaccharides content of the gills of the eel Anguilla anguilla (L.). Acta Ichthyol. Piscat. 5 (2): 47-64.

Industrial wastes, the main components of which were sulphates and phosphates, induced a decrease in the intensity of staining reactions for mucopolyaaccharides (MPS) in the gills of eels. The changes in the MPS content were positively correlated with the vital changes in fishes kept in waste water with an increased sulphate content at a raised pH value.