Organochlorine pesticides residues in feed and muscle of farmed Nile tilapia from Brazilian fish farms

Abstract

Organochlorine pesticide (OCP) concentrations were determined in fish muscle and feed collected from four different fish farms in Brazil. Nile tilapia from two growth stages, juveniles and adults, collected at two intensive tanks farms (IT1 and IT2) and two net cage farms (NC1 and NC2), were analyzed by High Resolution Gas Chromatography/High Resolution Mass Spectrometry. Pesticides were detected in almost all samples, but no samples exceeded international maximum limits for safe fish consumption. ΣDDT was the predominant pesticide in fish muscle, found in all fish samples, and endosulfan was the most predominant pesticide in feed, found in all feed samples. No significant correlation (p>0.05) was observed between the different growth stages and OCP concentrations, although slightly higher OCP concentrations were observed in adults. Among the rearing systems, NC farmed fish presented higher lipid levels and, consequently, higher OCP concentrations than fish from IT farms. Some OCPs (ΣHCH, aldrin, dieldrin and endrin) presented strong positive correlations (p<0.05) between feed and fish muscle concentrations, while others (ΣDDT, mirex, chlordane, ΣHCB and endosulfan) presented no correlation. However, the low levels of the sum of contaminants found in most of the feed samples may explain the low contaminant levels in fish tissue.

Environmental fate and behavior of persistent organic pollutants in Shergyla Mountain, southeast of the Tibetan Plateau of China

“…Two different pretreatment methods reported previously (Botaro et al, 2011;Wang et al, 2009;Zhu et al, 2012) were used to analyze the four groups of POPs (OCPs, PBDEs, PCBs and HBCDs) in this work. The detailed description about the pretreatment can be found in the Supporting Information.…”

Lichen, moss and soil in resolving the occurrence of semi-volatile organic compounds on the southeastern Tibetan Plateau, China

“…Two pretreatment methods, reported previously (Botaro et al, 2011;Wang et al, 2009;Zhu et al, 2012), were used to extract and concentrate OCPs and the three other types of organic pollutants (PBDEs, PCBs and HBCDs) from the samples. A detailed description of the pretreatment methods can be found in the Supplementary content.…”

Ultrasound‐assisted extraction and solid‐phase extraction as a cleanup procedure for organochlorinated pesticides and polychlorinated biphenyls determination in aquatic samples by gas chromatography with electron capture detection

“…Although most of them were banned decades ago, they can still be found in the environment especially in biological matrices. Simultaneous determination of both families of compounds has been also investigated in aquatic and food samples . Thus, legislation controls their content in different matrices; in fact some of them are included in the list of persistent organic pollutants .…”