HA5 Bioaccumulation and Biomagnifications
203 Oregon Ballroom
8:00 AM - 12:00 PM, Thursday
() Bioaccumulation and bioformation of OH-PCBs by juvenile rainbow trout (Oncorhynchus mykiss).
Buckman, A1, 2, Braekevelt, E3, Tomy, G3, Brown, S2, Solomon, K1, Fisk, A4, 1 University of Guelph, Guelph, Ontario, Canada2 Environment Canada, Burlington, Ontario, Canada3 Department of Fisheries and Oceans, Winnipeg, Manitoba, Canada4 University of Georgia, Athens, Georgia, USA
ABSTRACT- Recent findings of halogenated phenolic compounds (HPCs), including hydroxylated PCBs (OH-PCBs) and pentachlorophenol (PCP), in lake trout (Salvelinus namaycush) from the Great Lakes has raised questions about the source and fate of these compounds in the environment. These compounds are either accumulated from the environment, formed through biotransformation, or both. To assess the potential for OH-PCB accumulation, juvenile rainbow trout (Oncorhynchus mykiss) were exposed via diet to 45 OH-PCB congeners. To assess the potential for OH-PCB to be formed from PCBs, juvenile rainbow trout were exposed to a large number of PCB congeners and OH-PCBs were monitored in plasma. After 30 days exposure to dietary OH-PCBs, several OH-PCB congeres were present in the plasma of fish with a few of these congeners reaching levels of 68 ng/g, demonstrating that fish can accumulate OH-PCBs. However, OH-PCBs were also found in the plasma of fish exposed to PCBs for 30 days, demonstrating that rainbow trout (or their gut fauna) can from OH-PCBs from PCBs. Bioaccumulation parameters (half life, assimilation efficiency and BMFs) will be presented for the OH-PCBs and compared with the OH-PCB formation results to assess the relative importance of bioaccumulation and bioformation of OH-PCBs in fish.
Key words: bioaccumulation, OH-PCBs, bioformation, dietary accumulation