title: Effect of chronic exposure to pendimethalin on the susceptibility of rainbow trout, Oncorhynchus mykiss L., to viral hemorrhagic septicemia virus (VHSV).
abstract: In this study, the in vivo effects of chronic pollution by the active substance (AS) pendimethalin, a dinitroaniline herbicide, on the susceptibility of rainbow trout, Oncorhynchus mykiss L., to an experimental challenge with viral hemorrhagic septicemia virus (VHSV) were assessed. After four weeks of exposure to fresh water (C group) or 500 ng L(-1) of AS (P500 group), the fish were challenged by immersion in water containing 10(4) TCID(50) mL(-1) of VHSV. While exposure to pendimethalin was maintained throughout the experiment, mortalities were recorded during the 40 days post-infection (dpi) and organs were collected from dead fish for virological examination. At the end of the experiment, anti-VHSV antibodies and the classical pathway of complement activity were assessed in trout plasma. Exposure to pendimethalin significantly affected the distribution of cumulative mortality accelerating death in fish infected by VHSV. Pendimethalin appeared to decrease the Mean Time to Death (MTD) after virus treatment from 14.9 days (C-VHSV) to 10.2 days (P500-VHSV). Nevertheless, by the end of the experiment, differences in cumulative mortality were no longer observed between the two groups, which had reached the same stage (50 percent). Furthermore, a higher concentration of the virus was recovered from the pools of organs from the P500-VHSV group than the C-VHSV group. Moreover, at 40 dpi, although no significant difference was observed in the immune response between the two groups, more fish in the P500-VHSV group had set up an immune response by secreting antibodies than in the control viral group (C-VSHV).
authors.affiliation: Anses, Laboratoire Ploufragan-Plouzané, Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail, Technopôle Brest-Iroise, 29280 Plouzané, France. Electronic address: morgane.danion@anses.fr.
authors.forename: Morgane
authors.initials: M
authors.lastname: Danion
authors.affiliation: Cedre, Centre de Documentation, de Recherche et d'Expérimentations sur les Pollutions Accidentelles des Eaux, 715 rue Alain Colas, CS 41836 Brest Cedex 2, France.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Le Floch
authors.affiliation: Anses, Laboratoire Ploufragan-Plouzané, Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail, Technopôle Brest-Iroise, 29280 Plouzané, France.
authors.forename: Jeanne
authors.initials: J
authors.lastname: Castric
authors.affiliation: Anses, Laboratoire Ploufragan-Plouzané, Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail, Technopôle Brest-Iroise, 29280 Plouzané, France.
authors.forename: François
authors.initials: F
authors.lastname: Lamour
authors.affiliation: Anses, Laboratoire Ploufragan-Plouzané, Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail, Technopôle Brest-Iroise, 29280 Plouzané, France.
authors.forename: Joëlle
authors.initials: J
authors.lastname: Cabon
authors.affiliation: Anses, Laboratoire Ploufragan-Plouzané, Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail, Technopôle Brest-Iroise, 29280 Plouzané, France.
authors.forename: Claire
authors.initials: C
authors.lastname: Quentel
mesh_terms: D000814:Aniline Compounds / Q000633:toxicity*; D000818:Animals; D000917:Antibody Formation; D004198:Disease Susceptibility; D005260:Female; D031941:Hemorrhagic Septicemia, Viral; D006540:Herbicides / Q000633:toxicity*; D008297:Male; D029141:Novirhabdovirus; D017686:Oncorhynchus mykiss / Q000821:virology*; D013312:Stress, Physiological; D014874:Water Pollutants, Chemical / Q000633:toxicity
chemical_list: D000814:Aniline Compounds; D006540:Herbicides; D014874:Water Pollutants, Chemical; C030856:pendimethalin