title: Metal accumulation in crayfish, Procambarus clarkii, exposed to a petroleum-contaminated Bayou in Louisiana.
abstract: Red swamp crayfish (Procambarus clarkii) were placed for a period of 7 days in Bayou Trepagnier, a Louisiana waterway which received petroleum-laden effluents from a manufacturing complex several decades ago. However, coolant water from the plant continued to be released into the bayou until 1995. Analyses of sediments at the exposure site revealed heavy contamination by lead, chromium, and copper, while concentrations of arsenic and cadmium were very low. Significant bioaccumulation of lead was observed in the hepatopancreas and gills of 7-day-exposed crayfish, whereas chromium accumulated the most in the gills and blood. Concentrations of copper in the crayfish did not change during the course of the study, suggesting that this essential metal constituent of the respiratory pigment is successfully regulated even when crayfish are exposed to relatively high levels of copper in the sediments. There was no metal accumulation in the abdominal muscle of the crayfish. That damage to the hepatopancreas occurred during the exposure is suggested by histopathological studies which revealed swollen and vacuolated R cells and an increase in the pH of the digestive juices. Blood glucose levels, as well as ovarian and hepatopancreatic indices, were unchanged. This study demonstrates that accumulation of nonessential metals in crayfish tissues in a wetland environment contaminated by mixed pollution (metals and hydrocarbons) reflects the concentrations of metals in the sediment.
authors.affiliation: Department of Anatomy, Tulane University School of Medicine, New Orleans, Louisiana 70112, USA.
authors.forename: M B
authors.initials: MB
authors.lastname: Anderson
authors.forename: P
authors.initials: P
authors.lastname: Reddy
authors.forename: J E
authors.initials: JE
authors.lastname: Preslan
authors.forename: M
authors.initials: M
authors.lastname: Fingerman
authors.forename: J
authors.initials: J
authors.lastname: Bollinger
authors.forename: L
authors.initials: L
authors.lastname: Jolibois
authors.forename: G
authors.initials: G
authors.lastname: Maheshwarudu
authors.forename: W J
authors.initials: WJ
authors.lastname: George
mesh_terms: D000818:Animals; D003400:Astacoidea / Q000187:drug effects* / Q000378:metabolism; D001786:Blood Glucose / Q000032:analysis; D006838:Hydrocarbons / Q000378:metabolism*; D007220:Industrial Waste; D008099:Liver / Q000187:drug effects / Q000502:physiology; D019216:Metals, Heavy / Q000378:metabolism*; D010179:Pancreas / Q000187:drug effects / Q000502:physiology; D014018:Tissue Distribution; D014874:Water Pollutants, Chemical / Q000378:metabolism
chemical_list: D001786:Blood Glucose; D006838:Hydrocarbons; D007220:Industrial Waste; D019216:Metals, Heavy; D014874:Water Pollutants, Chemical