137Cs Levels in Fish of Different Limnological Types of Lakes in Finland During 1963

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Abstract
The limnological characterization of twelve lakes and three rivers in different parts of Finland and 137Cs analyses of several species of fish in these lakes and rivers were carried out. The lakes vary from oligotrophic (low-nutrient) lakes through dys-oligotrophic and dyseutrophic to fully eutrophic (high-nutrient) lakes. Correspondingly, the conductivity varies from 11 to 79 mho units, the colour from 5 to 100 mg Pt/L., the KMnO4 consumption from 8 to 144 mg/l., and the 137Cs content in different fish species in more or less direct relationship with the diminishing conductivity, e.g. perch (Perca fluviatilis) 0.2–20 nc/kg, pike (Esax lucius) 0.15–16 nc/kg, roach (Leuciscus rutilus) 0.1–7.5 nc/kg fresh weight, the highest values being in the fish of oligotrophic lakes, which waters have a low electrolytic conductivity. Other factors affecting the 137Cs content of the fish are its feeding habits and the general limnological character of the waters. The total beta-activity of the water varies only slightly and this variation evidently is not an important cause of the differences found in the 137Cs content of the fish.

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