Mataqueiro MI, Nakaghi LSO, Yamada PK, de Camargo Ferraz G, de Queiroz-Neto A, DeOliveira GH. Degradation, residual determination, and cholinesterase activity of triclorfon in Piaractus mesopotamicus Holmberg (PACU) 1887.
J Toxicol Environ Health A 2014;
77:125-132. [PMID:
24555653 DOI:
10.1080/15287394.2013.866928]
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Abstract
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 μg/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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