Abstract
1. 1. Blood contents of methaemoglobin (MetHb) and reduced glutathione (GSH) were determined during an annual cycle on hatchery-reared 1 +-2 + juveniles and once (in November) on adults of Baltic salmon ( Salmo salar L.). 2. 2. Evidence of the presence of both MetHb reductase and glutathione reductase activity was found in parr erythrocytes. 3. 3. The mean values of 8–19 specimens in each of nine age groups fell within 1.4–4.4% MetHb (of Hb concentration), 1.44–2.42 mmol GSH/1 erythrocytes and 0.32–0.72 for GSH/Hb ratio. 4. 4. Statistically significant temporal variation in blood estimates seemed to be influenced more by climate than by fish age.
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