ACCUMULATION AND EFFECTS OF AROMATIC AND CHLORINATED HYDROCARBONS IN JUVENILE ATLANTIC COD (GADUS-MORHUA) CAGED IN A POLLUTED FJORD (SORFJORDEN, NORWAY)
A. Goksoyr et al., ACCUMULATION AND EFFECTS OF AROMATIC AND CHLORINATED HYDROCARBONS IN JUVENILE ATLANTIC COD (GADUS-MORHUA) CAGED IN A POLLUTED FJORD (SORFJORDEN, NORWAY), Aquatic toxicology, 29(1-2), 1994, pp. 21-35
Juvenile Atlantic cod were placed in net cages on the bottom at 20-30
m depth at four sites from the inner end of Sorfjorden (Hardanger, Wes
tern Norway), to the northern mouth of the fjord in October 1990. Afte
r 4 weeks the fish were killed, and liver samples were analyzed for ar
omatic and chlorinated hydrocarbons (PAHs and PCBs). Liver and gill we
re also analyzed for cytochrome P450 1A induction, a biomarker for exp
osure and effects of these contaminants, using catalytic measurements
(7-ethoxyresorufin-O-deethylase, EROD) and immunodetection (P450 1A1-E
LISA). The caging resulted in the accumulation of a number of PAHs, bu
t very little PCBs, in the liver of the cod, with an inward gradient i
n the fjord. The gradient, although not dramatic in absolute terms, wa
s parallelled by elevated levels of P450 1A1 when measured by EROD and
, partly, by ELISA. The caging strategy seems to be a promising way to
approach ecotoxicologically relevant problems, such as bioavailabilit
y of contaminants, biomarker responses in the field, and dose-response
relationships, also under mixed contaminant situations.