Effect of ventilation and sediment ingestion on the uptake of HCB and B[a]P in a fish
The objective of this study was to determine whether sediment ingestion or water ventilation was the primary route of uptake for benzo[a]pyrene (BaP) and hexachlorobenzene (HCB) in the detritivorous fish, gizzard shad (Dorosoma cepedianum). Two experiments were conducted in which fish were exposed to sediments spiked with either 1 {micro}g/g BaP or 1 {micro}g/g HCB. In both experiments, fish were either allowed to feed on the sediment or were prevented from feeding by esophagus ligation. In both experiments, feeding fish created a very turbid environment. Concentrations of BaP-equivalents in the nonligated fish were not significantly different from that in the ligated fish, suggesting that water ventilation was the primary route of uptake for this compound. In contrast, concentrations of HCB found in the feeding fish were significantly greater than those found in the ligated fish. The uptake of BaP and HCB into the tissues of gizzard shad was undoubtedly influenced by a number of factors including compound bioavailability and fugacity. Nevertheless, these studies clearly point out that metabolism of the parent compound will also influence whether ventilation or food ingestion is the primary route of entry for lipophilic organic toxicants into the tissues of fish.
- OSTI ID:
- 442878
- Report Number(s):
- CONF-961149--
- Country of Publication:
- United States
- Language:
- English
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Uptake of benzo(a)pyrene in gizzard shad: The relative roles of water ventilation and sediment ingestion
The role of water ventilation and sediment ingestion in the uptake of benzo[a]pyrene in gizzard shad (Dorosoma cepedianum)