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Effects of pulp and paper mill discharges on caged rainbow trout (Oncorhynchus mykiss): biomarker responses along a pollution gradient in the Biobio River, Chile.
- Source :
-
Environmental toxicology and chemistry [Environ Toxicol Chem] 2006 Sep; Vol. 25 (9), pp. 2280-7. - Publication Year :
- 2006
-
Abstract
- Caging experiments were conducted using hatchery-reared, immature, female rainbow trout (Oncorhynchus mykiss) in three previously defined areas of the Biobio River (south central Chile) representing a pollution gradient from the pulp and paper mill discharges area: a pre-impact area (upstream area, reference location), an impact area (area directly influenced), and a postimpact area (downstream area, less influenced). No significant changes were observed in the physiological index as represented by condition factor (K) and liver somatic index during different sampling times (after 11, 21, and 30 d of exposure). Ethoxyresorufin-O-deethylase activities were significantly higher in trout caged at the impact and postimpact discharges areas (two- to fourfold) compared with the reference (pre-impact) area, and a strong inhibition of acetylcholinesterase activity, reaching 50%, was observed mainly in fish caged at the impact area. A significant endocrine-disrupting effect (reproductive level) was evidenced by significant increments in gonad somatic index and plasma vitellogenin levels combined with an induction of gonad maturation (presence of vitellogenic oocytes) in trout caged at the impact and postimpact areas. These results, generated by an in situ approach, confirmed our group's findings for trout exposed to sediment in the laboratory: discharges of pulp mill effluent in the Biobio River are associated with the effects evaluated at different biological levels.
- Subjects :
- Acetylcholine metabolism
Animals
Chile
Cytochrome P-450 CYP1A1 metabolism
Female
Gonads
Industry
Reproduction drug effects
Sexual Maturation
Vitellogenins blood
Water Pollution, Chemical adverse effects
Biomarkers analysis
Environmental Monitoring methods
Industrial Waste adverse effects
Oncorhynchus mykiss physiology
Paper
Rivers
Water Pollutants, Chemical toxicity
Subjects
Details
- Language :
- English
- ISSN :
- 0730-7268
- Volume :
- 25
- Issue :
- 9
- Database :
- MEDLINE
- Journal :
- Environmental toxicology and chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 16986781
- Full Text :
- https://doi.org/10.1897/05-385r.1