Abstract
Electron microscopic study of the surface and of ultrathin sections of the olfactory lining performed in seven species of freshwater fish of the Acipenserformes, Salmoniformes, Cypriniformes, and Perciformes orders. The cells that contain numerous mitochondria and well-developed tubular reticulum and have a peculiar shape of the apical surface were found in the olfactory epithelium of all the fish studied. They were identified as chloride cells, i.e., cells with a clearly seen ion-transporting specialization. The excretory character of their activity and a possible participation in maintaining a certain and constant ion composition of the mucus on the olfactory epithelium surface is discussed.
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