Hm. Sleiderink et Jp. Boon, CYTOCHROME-P450 1A RESPONSE IN NORTH-SEA DAB, LIMANDA-LIMANDA, FROM OFFSHORE AND COASTAL SITES, Marine pollution bulletin, 30(10), 1995, pp. 660-666
Dab (Limanda limanda) were collected at four stations in the southern
North Sea in November 1993, Highest muscle polychlorinated biphenyl (P
CB) concentrations were found at a station near the Dutch coast, CB153
was the dominant congener at all stations. Since the concentrations o
f two mono-ortho Cl-substituted congeners covaried strongly with CB153
, this congener appears to be a good marker for general differences in
PCB concentrations. Mean CB153 concentrations ranged from 50-160 ng g
(-1) lipid, The highest cytochrome P450 1A (CYP1A) levels were also fo
und at the coastal station, The extent of induction, measured catalyti
cally (7-ethoxyresorufin O-deethylase, EROD) and immunochemically (CYP
1A ELISA), between the less contaminated offshore sites and the coasta
l site ranged up to five-fold, Both parameters were well correlated wi
th muscle tissue PCB concentrations. The data indicate that the CYP1A
induction response in dab populations along the Dutch coast is strong
enough to separate the Dutch coastal area from more pristine offshore
areas of the North Sea. Compared to results of previous studies in oth
er seasons the present sampling period offered the best conditions to
investigate the correlation between environmental contamination with P
CBs and related compounds, since the variations in natural factors tha
t also interfere, such as water temperature and condition of the fish,
were very low.