Bioconcentration of trichlorfon insecticide in pacu ( Piaractus mesopotamicus)

• Published in: Chemosphere (Oxford) 2006-06, Vol.64 (1), p.56-62
• Main Authors: Lopes, Ruy Bessa, Paraiba, Lourival Costa, Ceccarelli, Paulo Sérgio, Tornisielo, Valdemar Luiz
• Format: Article
• Language: English
• Subjects: Agnatha. Pisces; Animal, plant and microbial ecology; Animals; Applied ecology; Aquaculture; Argulus; bioaccumulation; Biological and medical sciences; Ecotoxicology, biological effects of pollution; Epizooty; farmed fish; fish culture; Fish ectoparasite; Fish ponds; Fishes - metabolism; Freshwater; freshwater fish; Fundamental and applied biological sciences. Psychology; General aspects; Half-Life; insecticide residues; Insecticides - pharmacokinetics; Lernae; Models, Biological; Muscles - metabolism; Piaractus mesopotamicus; trichlorfon; Trichlorfon - pharmacokinetics; Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution; Water Pollutants, Chemical - pharmacokinetics; water pollution
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2005.11.029

Pacu ( Piaractus mesopotamicus) is one of the most representative fish species of Brazilian fish culture, produced in most Brazilian States due to its importance for food diet and sport fishery. This research work investigated the bioconcentration of trichlorfon [ phosphonic acid, ( 2, 2, 2-trichloro-1-hydroxyethyl) -dimethyl ester] insecticide in pacu under fish ponds culture conditions and a first-order kinetic insecticide dissipation in the water. Trichlorfon was applied at a rate of 4.62 × 10 4 mg to each of three nurseries containing 4.2 × 10 5 l of water. The fish ponds were built on the soil and supported 60 young pacus fishes. The concentrations of trichlorfon fitted to an equivalent non-linear kinetic type model, allows estimate the values of trichlorfon concentration in the water and fishes. These estimations together with the bioconcentration factor determined in the fishes, allowed establishing theoretical reference limit values for human consumption of fishes produced under cultivation systems with trichlorfon. This information will contribute to enlarge the database on pesticide use in Brazilian commercial fish farming, especially about the use of trichlorfon as chemotherapy for the control of fish ectoparasites.