title: Comparative embryotoxicity of pulp mill extracts in rainbow trout (Oncorhynchus mykiss), American flagfish (Jordanella floridae) and Japanese medaka (Oryzias latipes).
abstract: This study evaluated the effects of Chilean pulp mill effluent extracts (untreated, primary and secondary treated pulp mill effluents), along with steroid standards (testosterone and 17β-estradiol) and a wood extractive standard (beta-sitosterol) on developing post-fertilized fish embryos. Our study included a cold freshwater species, rainbow trout (Oncorhynchus mykiss), and two warm freshwater species American flagfish (Jordanella floridae) and Japanese medaka (Oryzias latipes). Embryotoxicity results included delay in time to hatch and decreased hatchability but no significant egg and larvae mortality was observed in the pulp mill extract exposed embryos. By contrast, significant early hatching and increased hatchability were observed in beta-sitosterol exposed embryos, along with high mortality of testosterone exposed embryos across species. Teratogenic responses were observed in medaka embryos in all treatments. Abnormalities were detected starting at development stages 19-20 (2-4 somite stages) and included optical deformities (micro-opthalmia, 1 or 2 eyes) and lack of development of brains and hearts. Additionally, phenotypic sex identification of surviving offspring found female-biased sex-ratios in all treatments except testosterone across species. Overall, our study indicated that Chilean pulp and paper mill extractives caused embryotoxicity (post-fertilized embryos) across species and irrespective of the effluent treatment. The effects were mainly associated with delayed time to hatch, decreased hatchability, and species-specific teratogenesis.
authors.affiliation: Aquatic Toxicology Laboratory, Faculty of Science, University of Ontario Institute of Technology, Oshawa L1H 7K4, ON, Canada. rodrigo.orrego@uoit.ca
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Orrego
authors.forename: John
authors.initials: J
authors.lastname: Guchardi
authors.forename: Lindsay
authors.initials: L
authors.lastname: Beyger
authors.forename: Rachelle
authors.initials: R
authors.lastname: Krause
authors.forename: Douglas
authors.initials: D
authors.lastname: Holdway
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D003532:Cyprinodontiformes / Q000002:abnormalities / Q000196:embryology* / Q000502:physiology; D004625:Embryo, Nonmammalian / Q000002:abnormalities / Q000187:drug effects*; D004784:Environmental Monitoring; D005260:Female; D007220:Industrial Waste; D008297:Male; D017686:Oncorhynchus mykiss / Q000002:abnormalities / Q000196:embryology* / Q000502:physiology; D009990:Oryzias / Q000002:abnormalities / Q000196:embryology* / Q000502:physiology; D012744:Sex Ratio; D014874:Water Pollutants, Chemical / Q000633:toxicity*; D014934:Wood
chemical_list: D007220:Industrial Waste; D014874:Water Pollutants, Chemical