[Tissue distribution of PBDEs in Mandarin fish]

Area of Science:

• Environmental Chemistry
• Ecotoxicology
• Marine Biology

Context:

• Polybrominated diphenyl ethers (PBDEs) are persistent organic pollutants widely used as flame retardants.
• Aquatic organisms are susceptible to PBDE bioaccumulation through environmental exposure.
• Mandarin fish (Siniperca chuatsi) are a significant freshwater species, making them important bioindicators.

Purpose:

• To quantify the levels and distribution of various polybrominated diphenyl ether (PBDE) congeners in Mandarin fish tissues.
• To identify specific tissues where PBDEs accumulate most significantly.
• To elucidate the primary pathways of PBDE uptake in Mandarin fish.

Summary:

• Gas chromatography-mass spectrometry was employed to analyze PBDE congeners (BDE28, 47, 66, 85, 99, 100, 138, 153, 154, 183, and 209) in Mandarin fish tissues.
• The highest mean concentrations of sigma10 PBDEs were observed in kidney tissues (5.71 ng x g(-1) dry weight), while muscle tissues showed the lowest (0.95 ng x g(-1) dry weight).
• BDE47 was the dominant low-brominated congener, and BDE209 was detected in 45.2% of samples, with higher levels in kidney and gonad.

Impact:

• The study reveals significant bioaccumulation of PBDEs in Mandarin fish, particularly in lipid-rich organs like the kidney, liver, and swimming bladder.
• Findings suggest PBDE uptake occurs via both dietary ingestion and gill absorption, highlighting potential risks to aquatic ecosystems.
• This research provides crucial data for assessing the environmental health and food safety implications of PBDE contamination in freshwater fish.