title: Effects of carbofuran on the sea bass (Dicentrarchus labrax L.): study of biomarkers and behaviour alterations.
abstract: The objective of this study was to investigate the acute effects of the pesticide carbofuran on the sea bass (Dicentrarchus labrax) using parameters at different levels of biological organisation (swimming behaviour and several biomarkers) and possible relationships between alterations found in different effect criteria. In a bioassay, sea bass juveniles were individually exposed to different doses of carbofuran (31, 63, 125 and 250 μg/L) for 96 h. At the end of the bioassay, the swimming performance and 11 biomarkers were determined. Biomarkers were: hepatosomatic index (HSI), lipid peroxidation (LPO), reduced glutathione and the activities of the enzymes ethoxyresorufin O-deethylase (EROD), glutathione S-transferases, superoxide dismutase, catalase, glutathione peroxidase, glutathione reductase, brain acetylcholinesterase (AChE) and muscle cholinesterases (ChE). After 96 h of exposure, carbofuran induced a decrease of the swimming velocity and inhibition of EROD activity at all concentrations tested, and inhibition of muscle ChE and brain AChE activities at 250 μg/L. No relevant alterations in any of the other tested parameters were found. These results show that carbofuran induced adverse effects on fish by interfering with neurofunction, capability of detoxication and swimming velocity. In addition, positive and significant correlations between the swimming velocity and (i) brain AChE activity, (ii) muscle ChE activity and (iii) EROD activity suggest that the inhibition of these enzymes may somehow be related to the behavioural changes observed. Since these functions are determinant for the survival and performance of the fish in the wild, the findings of the present study suggest that adverse effects may occur in populations exposed to carbofuran if a sufficient number of animals is affected.
authors.affiliation: Toxicology Area, Veterinary College, University of Extremadura. Av. Universidad s/n, 10071 Cáceres, Spain. davidhm@unex.es
authors.forename: David
authors.initials: D
authors.lastname: Hernández-Moreno
authors.forename: Marcos
authors.initials: M
authors.lastname: Pérez-López
authors.forename: Francisco
authors.initials: F
authors.lastname: Soler
authors.forename: Carlos
authors.initials: C
authors.lastname: Gravato
authors.forename: Lúcia
authors.initials: L
authors.lastname: Guilhermino
mesh_terms: D000110:Acetylcholinesterase / Q000378:metabolism; D000818:Animals; D001492:Bass / Q000378:metabolism* / Q000502:physiology; D015415:Biomarkers / Q000032:analysis; D002235:Carbofuran / Q000633:toxicity*; D002374:Catalase / Q000378:metabolism; D019363:Cytochrome P-450 CYP1A1 / Q000378:metabolism; D004781:Environmental Exposure / Q000009:adverse effects; D005978:Glutathione / Q000378:metabolism; D005979:Glutathione Peroxidase / Q000378:metabolism; D005980:Glutathione Reductase / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D010575:Pesticides / Q000633:toxicity*; D013482:Superoxide Dismutase / Q000378:metabolism; D013550:Swimming
chemical_list: D015415:Biomarkers; D010575:Pesticides; D002374:Catalase; D005979:Glutathione Peroxidase; D019363:Cytochrome P-450 CYP1A1; D013482:Superoxide Dismutase; D005980:Glutathione Reductase; D005982:Glutathione Transferase; D000110:Acetylcholinesterase; D005978:Glutathione; D002235:Carbofuran