Title: EROD-Aktivitäten in Lebern von Klieschen (Limanda limanda L.) aus der Nordsee und Flundern (Platichthys flesus L.) aus sieben Nordseezuflüssen
Abstract:In 1991 and 1992 the induction of the cytochrome-P4501A-(CYP1A)-monooxygenase in livers of the flatfish species dab (Limanda limanda L.) and flounder (Platichthys flesus L.) from the North Sea and sev...In 1991 and 1992 the induction of the cytochrome-P4501A-(CYP1A)-monooxygenase in livers of the flatfish species dab (Limanda limanda L.) and flounder (Platichthys flesus L.) from the North Sea and several estuaries was investigated by measuring the catalytic (EROD-)activity. Liver samples from approximately 5 000 fish from 69 different sampling sites were prepared. Dab were caught in the North Sea between 51° N and 58° N and flounder in the estuaries of the rivers Eider, Elbe, Weser, Scheldt (Western Scheldt), Thames, Tyne and the Firth of Forth. EROD activity was measured for adult males and females with a body length between 17,0 cm and 25,0 cm and juvenile dab (length ≤ 12 cm). For the purpose of interpreting distribution patterns of EROD activities endogenous and exogenous modifying factors were considered. Some of the investigations were carried out in the course of the research project „Fish diseases in the North Sea”. By the research project concentrations of organochlorines in livers of dab and flounder were also determined (see Landwust et al. 1996). These results are taken into account in order to find out relationships between EROD activities and organochlorine contents in the livers. The investigations carried out by the research project were in line with the recommendations of the North Sea Task Force (NSTF) and Joint Monitoring Group (JMG). In January 1991 and 1992 the EROD activity in dab from the western North Sea and south of Dogger Bank was low in comparison with other areas. High EROD-activities were measured in the Ekofisk oilfield, in the eastern North Sea (German Bight and off Denmark) and in places on the Dogger Bank. Dab from the area between Denmark and Dogger Bank had higher enzyme activities compared with the German Bight. In August 1991, dab from eastern British coastal waters displayed EROD-activities significantly higher than off the Dutch and German coast line. EROD activities in flounders from the estuaries of the Elbe, Scheldt and Tyne were elevated. In several estuaries the spatial distribution pattern of EROD activities in flounder were in correspondence with liver PCB concentrations (see Landwust et al. 1996).Read More
Publication Year: 2003
Publication Date: 2003-01-01
Language: en
Type: article
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