Changes in Some Hematological Characteristics of Coho Salmon (Oncorhynchus kisutch) in Response to Acute Exposure to Dehydroabietic Acid (DHAA) at Different Exercise Levels

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Abstract
To determine if changes in some hematological parameters accompanied acute exposure of juvenile coho salmon (O. kisutch) to dehydroabietic acid (DHAA) at 3 different exercise levels, clotting times, hematocrits, erythrocyte sedimentation rates, red blood cell counts and white blood cell counts were monitored over 6-, 12-, 24- and 48-h exposure periods to 0.75 mg/l DHAA. White cell counts decreased significantly after 24 h exposure and there was a significant increase in clotting times after 48 h exposure to DHAA. In both cases, differences between experimentals and controls were significant only at low and intermediate exercise levels and not at a high exercise level. Hematocrits, erythrocyte sedimentation rates, and red blood cell counts were not significantly different between experiments and controls for any of the exposure periods or exercise levels. [DHAA is one of several naturally occurring resin acids extracted from softwood trees during the kraft process and is present mainly in the effluent from the pulping section of a kraft mill. Exercise level was studied to see if a natural environmental factor might impose nonlethal stress which could modify toxic or sublethal effects of a pollutant.].

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