Effects of Tetrachloroguaiacol (TeCG) on the Osmoregulation of Adult Coho Salmon (Oncorhynchus kisutch).

The article investigates on the toxic action of tetrachloroguaiacol (TeCG) and its effect on osmoregulation of adult coho salmon (Oncorhynchus kisutch) in freshwater as well as during seawater challenge. Fish sampling was achieved by terminal anaesthetization with MS222 or tricaine. Anaesthetization prior to sampling has been demonstrated to have no effect on plasma ion concentrations. Blood samples were obtained through the caudal ventral vein. Blood hemoglobin concentrations were determined through analysis of the hemolyzed blood and Drabkin's solution mixture. There were no changes in hematocrit, hemoglobin concentration or mean red cell volume. Overall findings revealed that TeCG can adversely effect the osmoregulation of adult coho salmon in freshwater and during seawater adaptation.