Transfer of Cs into fish in small forest lakes

The transfer of ¹³⁷Cs into fish in seepage and drainage lakes from 1988 to 1992 was analysed using linear regression. Empirical results for ¹³⁷Cs in lake water and fish were used to calculate concentration factors (CFs). In the drainage lakes the CF decreased during the study period by 9% per year whereas in the seepage lakes the CF increased significantly by 4.3% per year. The transfer of ¹³⁷Cs into pike was significantly (1.6 times) higher than that into perch. The CF increased on average by 3.4% for each 1-cm increase in the median size of perch. The relationship between the water chemistry and the CF differed between clear-water seepage and brown-water drainage lakes.     

Polycyclic aromatic hydrocarbons and hydroxylated metabolites in the muscle tissue of Eurasian perch (Perca fluviatilis) through dietary exposure during a 56-day period

Eurasian perch (Perca fluviatilis) was exposed trophically to phenanthrene, pyrene and benzo[a]pyrene. Accumulation kinetics in the muscle tissue of parent PAHs and hydroxylated metabolites were established for 56 days at 3 levels of exposure (0, 100 and 500 μg/kg BW). Benzo[a]pyrene and 3-hydroxy-benzo[a]pyrene were not detected in the muscles. During exposure, there was an increase in phenanthrene, pyrene and their hydroxylated metabolites in the muscle tissue. Low transfer to muscle tissue was observed at equilibrium for phenanthrene (4.4 ± 0.6% and 2.7 ± 0.8%) and pyrene (1.0 ± 0.2% and 0.33 ± 0.09%), depending on the concentrations in the spiked feed.     

HALOGENATED CONTAMINANTS IN FEMALE PERCH FROM THE MATSALU BAY (BALTIC SEA)

Polychlorinated biphenyls (PCBs). DDT-related substances, hexachlorocyclohexane (HCH) and hexachlorobenzene (HCB) were analysed in female perch ( Perca fluviatilis ) collected in August and September 1999 in Matsalu Bay (Baltic Sea). Concentrations of all halogenated compounds were very low and notably lower than threshold values reported by FAO/WHO guidelines.