02020naa a2200289 a 450000100080000000500110000800800410001910000170006024501060007726000090018352012430019265000280143565000160146365000150147965000090149465000100150365000170151365300130153065300170154365300170156065300110157765300310158870000190161970000220163870000220166077300480168210153532015-08-13       2006    bl uuuu     u00u1 u    #d1 aLOPES, R. B.  aBioconcentration of trichlorfon insecticide in pacu (Piaractus mesopotamicus).h[electronic resource]  c2006  aPacu (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 x 104 mg to each of three nurseries containing 4.2 x 105 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.  aPiaractus mesopotamicus  aAquicultura  aInseticida  aPacu  aPeixe  aPiscicultura  aControle  aDissipação  aEctoparasita  aEfeito  aFator de bioconcentração1 aPARAIBA, L. C.1 aCECCARELLI, P. S.1 aTORNISIELO, V. L.  tChemosphere, Oxfordgv. 64, p. 56-62, 2006.