Determination of PCB Elimination Coefficients in Round Goby and Tubenose Goby

Abstract

Whole-body elimination coefficients of polychlorinated biphenyls (PCBs) were determined in two Great Lakes invasive fish species, round goby (Neogobius melanostomus) and tubenose goby (Proterorhinus semilunaris). Elimination rates were determined for a set of model PCB congeners (n = 12 congeners) dosed to fish by intraperitoneal injection and allowed to depurate at a temperature of 21.4°C for 90 days. Eight PCBs (PCB 6, 21, 57, 62, 68, 89, 112 and 125) exhibited significant elimination by round goby and had corresponding half lives ranging from 13 to 39.8 days. For tubenose goby, four congeners (PCBs 21, 57, 62 and 68) exhibited significant elimination with half lives in the range from 18.8 to 48.8 days. Whole-body elimination rate coefficients were significantly higher for round gobies compared to tubenose goby. In both cases, PCB elimination rate coefficients were negatively related to chemical log KOW.

Effect of Microplastic Amendment to Food on Diet Assimilation Efficiencies of PCBs by Fish

“…The mean microbead weight was 0.037 mg/ bead and they ranged from 100 to 500 μm in size. Microbeads were dosed with nonenvironmental polychlorinated biphenyls (hence referred to as performance reference compounds or PRCs 27 ). The PRC−PCBs were purchased as individual standards and consisted of PCBs 6,13,23,21,43,62,68,57,89,112,125,166,204, and 205 (AccuStandard, New Haven, CT) and chosen because of (i) rare occurrence in commercial Aroclor mixtures, (ii) ability to analytically distinguish from Aroclor-PCBs and (iii) their wide range in chemical hydrophobicity.…”

“…PCB congeners were identified by retention time and quantified using a certified standard (Quebec Ministry of Environment Congener mix; AccuStandard, New Haven, CT) for Aroclor PCBs or an in-house standard for PRC−PCBs. 27 For each set of six samples analyzed, a method blank and inhouse fish reference tissue 29 were coextracted. The average ± standard deviation recovery of PCB 34 was 90.3 ± 12.5%.…”

“…PCBs were analyzed on an Agilent 5890 gas chromatograph with 63 Ni electron capture detector (GC-ECD). PCB congeners were identified by retention time and quantified using a certified standard (Quebec Ministry of Environment Congener mix; AccuStandard, New Haven, CT) for Aroclor PCBs or an in-house standard for PRC–PCBs . For each set of six samples analyzed, a method blank and in-house fish reference tissue were coextracted.…”

The effects of intensive trapping on invasive round goby densities

“…Additionally, round gobies negatively impact native fish populations by feeding on the eggs of lake sturgeon (Acipenser fulvescens) [13], mottled sculpin (Cottus bairdii) [4], lake trout (Salvelinus namaycush) [14,15] and smallmouth bass (Micropterus dolomieu) [16]. Although they are one of the few organisms that prey on the invasive zebra dreissenid mussel (Dreissena polymorpha) [17], this benefit is offset by potential biomagnification of polychlorinated biphenyls (PCBs) from mussel ingestion, which could lead to increased toxins in game fishes [18][19][20].…”