Brazilian Journal of Biology https://doi.org/10.1590/1519-6984.236427 ISSN 1519-6984 (Print) Original Article ISSN 1678-4375 (Online) Bioaccumulation of Pyrethroid in Parasite Wenyonia acuminata (Cestoda: Caryophyllaeidae) and Host fish Synodontis clarias (Linnaeus, 1758) from Lekki Lagoon, Lagos Nigeria B. Akinsanyaa, P. O. Isiborb* , F. Olalerua, A. Abayomic, E. Akeredolua, M. I. Ohazulikea and J. K. Saliua aUniversity of Lagos, Department of Zoology, Akoka, Lagos, Nigeria bCovenant University, Department of Biological Sciences, Ota, Ogun State Nigeria cUniversity of Lagos, Department of Chemistry, Akoka, Lagos, Nigeria *e-mail:
[email protected] Received: April 10, 2020 – Accepted: June 18, 2020 – Distributed: August 31, 2021 (With 4 figures) Abstract This study was aimed at determining the concentration of pyrethroid in the surface water, sediment, Weyonia acuminata and Synodontis clarias fish in Lekki lagoon, Lagos, Nigeria. In-situ physicochemical analysis of the surface water was conducted using a calibrated handheld multi-parameter probe (Horiba Checker Model U-10). Intestinal samples from infected and uninfected fish were analyzed for pyrethroid concentrations, microbial colonization, proteins (PRO), superoxide dismutase (SOD), catalase (CAT), reduced glutathione (GSH), malonaldehyde (MDA) and glutathione peroxidase (GPx). The histopathology of infected and uninfected intestinal tissues were analyzed using Haematoxylin and Eosin (H&E) stains and examined under a binocular light microscope (Model 230485). A total of 39 out of 98 S. clarias fish were infected with cestode parasite, Wenyonia acuminate, amounting to 39% parasite prevalence. Among the tested pyrethroids, Cyfluthrin and Alpha –cypermethrin had significant sorption of 1.62 and 3.27 respectively from the aqueous phase to the bottom sediment of the lagoon.