title: Bioaccumulation of 137Cs in pelagic food webs in the Norwegian and Barents Seas.
abstract: Knowledge and documentation of the levels of radioactive contamination in fish stocks important to Norwegian fisheries is of major importance to Norwegian consumers and fish export industry. In the present study, the bioaccumulation of caesium-137 ((137)Cs) has been investigated in marine food webs in the Barents and Norwegian Seas. The contents of (137)Cs in the different organisms were generally low (<1 Bq kg(-1) wet weight), but a marked bioaccumulation was apparent: The concentration of (137)Cs was about 10-fold higher in the harbour porpoise Phocoena phocoena, representing the upper level of the food web, than in the amphipod Themisto sp., representing the lower level of the food web. The Concentration Factors (CF=Bq kg(-1) wet weight/Bq l(-1) seawater) increased from 10+/-3 for a mixed sample of krill and amphipods to 165+/-5 for harbour porpoises.
authors.affiliation: Institute of Marine Research, PO Box 1870 Nordnes, N-5817 Bergen, Norway. hilde.elise.heldal@imr.no
authors.forename: Hilde Elise
authors.initials: HE
authors.lastname: Heldal
authors.forename: Lars
authors.initials: L
authors.lastname: Føyn
authors.forename: Per
authors.initials: P
authors.lastname: Varskog
mesh_terms: D033304:Amphipoda; D000818:Animals; D001110:Arctic Regions; D001835:Body Weight; D002586:Cesium / Q000493:pharmacokinetics*; D002588:Cesium Radioisotopes / Q000493:pharmacokinetics; D004784:Environmental Monitoring; D005399:Fishes; D020387:Food Chain; D009664:Norway; D019576:Porpoises; D014018:Tissue Distribution; D014875:Water Pollutants, Radioactive / Q000493:pharmacokinetics*
chemical_list: D002588:Cesium Radioisotopes; D014875:Water Pollutants, Radioactive; D002586:Cesium