Effects of pyrolytic and petrogenic polycyclic aromatic hydrocarbons on swimming and metabolic performance of zebrafish contaminated by ingestion.
Depending on their origins, polycyclic aromatic hydrocarbons (PAH) are characterized by different chemical properties. Petrogenic PAH (e.g. from fossil fuels) and pyrolytic PAH (e.g. those produced by incineration processes) are therefore expected to affect organisms differently. The impact of trophic exposure to these PAH was investigated on swimming and metabolic performance of zebrafish Danio rerio. Two-month-old juveniles and six-month-old adults were individually challenged following a swimming step protocol. While pyrolytic exposure did not affect fish whatever the duration of exposure, it appeared that petrogenic PAH impaired adults' performance. Indeed, the active metabolic rate in petrogenic PAH-contaminated adults was significantly reduced by 35%, and critical swimming speed by 26.5%. This was associated with cardiac abnormalities, which are expected to contribute to the reduction of oxygen transport, particularly during intensive effort. These results may be due to the different composition and toxicity of PAH mixtures.
UMR 7266 Littoral Environnement Sociétés (LIENSs), Institut du Littoral et de l'Environnement, 2 rue Olympe de Gouges, 17000 La Rochelle, France; Ifremer, Place Gaby Coll, BP7, 17137 L'Houmeau, France. Electronic address: julie.lucas@laposte.net.
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J
Lucas
UMR 7266 Littoral Environnement Sociétés (LIENSs), Institut du Littoral et de l'Environnement, 2 rue Olympe de Gouges, 17000 La Rochelle, France.
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I
Percelay
INRA UMR 703, APEX, Oniris, La Chantrerie, 44300 Nantes, France.
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T
Larcher
UMR 7266 Littoral Environnement Sociétés (LIENSs), Institut du Littoral et de l'Environnement, 2 rue Olympe de Gouges, 17000 La Rochelle, France.
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Lefrançois
D000293:Adolescent; D000818:Animals; D004435:Eating; D005579:Fossil Fuels; D006330:Heart Defects, Congenital / Q000139:chemically induced; D006801:Humans; D017745:Incineration; D011084:Polycyclic Aromatic Hydrocarbons / Q000633:toxicity*; D013550:Swimming; D014874:Water Pollutants, Chemical / Q000633:toxicity*; D015027:Zebrafish / Q000002:abnormalities / Q000378:metabolism / Q000502:physiology*
D005579:Fossil Fuels; D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical
Aerobic metabolic rate; Critical swimming speed; Petroleum hydrocarbons; Sub-lethal concentration; Trophic exposition