Degradation, residual determination, and cholinesterase activity of triclorfon in Piaractus mesopotamicus Holmberg (Pacu) 1887
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2014-02-01
Autores
Mataqueiro, Maria Isabel [UNESP]
Okada Nakaghi, Laura Satiko [UNESP]
Yamada, Patricia Kii [UNESP]
Ferraz, Guilherme de Camargo [UNESP]
Queiroz-Neto, Antonio de [UNESP]
DeOliveira, Georgino Honorato [UNESP]
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Taylor & Francis Inc
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The aim of this study was to determine the no-observable-adverse-effect concentration (NOAEC) for trichlorfon, an antiparasitic agent used in aquaculture, in Piractus mesopotamicus (pacu) using acetylcholinesterase (AChE) activity as an end point. Fish were exposed 24 h/d for 15 d to different concentrations of trichlorfon in tanks of water for which a curve of dissipation was previously determined. Analysis of trichlorfon in water and fish plasma using gas chromatography with electron capture detection (GC-ECD) enabled measurement of limit of detection (LOD) and limit of quantification (LOQ), respectively, to be 3 and 10 ppb. Thirty-six hours after trichlorfon dilution in water, the concentration was below the LOD, and data showed that plasma concentrations did not exceed the LOQ. Apart from the 6.25 g/L, all concentrations of trichlorfon significantly inhibited plasma and brain AChE activity compared to controls. The AChE activity levels returned to control values in 7 d. These data may be useful to determine the concentration of trichlorfon that destroys parasites without producing adverse effects in fish.
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Journal Of Toxicology And Environmental Health-part A-current Issues. Philadelphia: Taylor & Francis Inc, v. 77, n. 1-3, p. 125-132, 2014.