Structure of Chloride Cell in

Abstract: The gills are an important organ in fishes, with specific functions and is highly sensitive to many Factors. Chloride cell in gill's epithelia has the main role in these functions. These cells exhibit the Features of ion's transporting cells. An ultra structural study was performed on chloride cells of euryhaline telaji in south of Caspian Sea. The chloride cells are distributed in the interlamellar region of filaments. They are oval to elongated form with an apical positioned nucleus, expanded tubular system and heteromorphic mitochondria. These cells are surrounded by pavement cell and accessory cell. A small depressed surface formed by pavement cells and chloride cells that are in contact with the aquatic milieu. There are also channel systems in accessory cells that are in continuity with intercellular area. There is only one type of chloride cell in telaji, that's resembled to B-cell. This feature and also the broad loose network of tubular system seem to chloride cell of freshwater species. Key words: Gill Filament Chloride cell Telaji INTRODUCTION organ compromises the survival of fish. In addition, the gills represent an appropriate model for the study of the The telaji (in Mazandarani), belongs to cyprinidea potention environment effects on the fish organism and, family is one of the most important endemic species of indirectly an indicator of degree of environmenta