Organochlorine pesticides residues in feed and muscle of farmed Nile tilapia
from Brazilian fish farms
Daniele Botaro, João Paulo Machado Torres, Olaf Malma, Mauro Freitas Rebelo,
Bernhard Henkelmann, Karl-Werner Schramm,
Food and Chemical Toxicology 49 (2011) 2125–2130

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. RDDT 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 (RHCH, aldrin, dieldrin
and endrin) presented strong positive correlations (p < 0.05) between feed and fish muscle concentrations,
while others (RDDT, mirex, chlordane, RHCB 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.

Original gentilmente disponibilizado pelo autor e Professor Joao Paulo Machado Torres

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