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Dietary uptake efficiency of 2,2ǐ,4,4ǐ,5,5ǐ‐hexachlorobiphenyl in yellow perch and rainbow trout: Role of dietary and body lipids
Author(s) -
Dabrowska Henryka,
Fisher Susan W.,
Dabrowski Konrad,
Staubus Alfred E.
Publication year - 1999
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620180518
Subject(s) - rainbow trout , perch , bioaccumulation , trout , chemistry , zoology , fish <actinopterygii> , biology , juvenile , food science , fishery , environmental chemistry , ecology
Dietary uptake efficiency (α) and elimination rate constants ( k d ) of 2,2ǐ,4,4ǐ,5,5ǐ‐hexachlorobiphenyl (HCBP) were determined in two fish species, yellow perch and rainbow trout, to investigate the influence of dietary and body lipid levels on bioaccumulation. Groups of juvenile fish with significant differences in percent body lipid were fed with a low‐fat(LF) or high‐fat (HF) diet spiked with 5 or 50 ppb of 14 C‐HCBP for 32 d. Thereafter, fish were fed an uncontaminated LF or HF diet to allow for elimination of HCBP. Feeding and growth rates were quantified. There were eight fish lipid/dietary lipid/HCBP concentration exposure combinations for each species. Four fish from each exposure were collected at the beginning of the study and at 10‐17‐d intervals during exposure and elimination periods for lipid and 14 C‐HCBP analysis. The a values ranged from 74 to 95% in yellow perch and from 79 to 99% in rainbow trout. The greatest a values, of 95 to 99%, were found in fish given diets with 5 ppb HCBP. Uptake of HCBP was influenced by both dietary and body lipids and depended on the current status of both lipid pools. The elimination rate constants were in the range of 0.000 to 0.004 d −1 in yellow perch and 0.003 to 0.010 d −1 in rainbow trout. No significant differences in elimination rate constants between HF and LF fish groups were found. In fish on a constant dietary lipid regime, the k d values tended to be less in HF than in LF fish. However, in fish groups offered diets with a change in lipid regime, the k d tended to be greater. Lipid × time interactions in the HF and LF fish groups undergoing a change in lipid regime indicated that the k d values, like the a values, were influenced by both lipid pools. Changes in elimination rates due to dietary/body lipid status impacted BAFs more strongly than changes in uptake efficiencies. The BAFs were in the range of 1.11 to 2.49 in yellow perch and 1.5 to 4.3 in rainbow trout.