Seasonal variation and impact of linear alkyl sulphonate (LAS) toxicity on Nile tilapia, Oreochromis niloticus in two Nile Delta Lagoons, Egypt

Abstract

ABSTRACT The aim of the present study is to assess the accumulation of detergents residues; linear alkylbenzene sulphonate (LAS) in Burullus and Edku lagoons water, sediments, and muscles of Oreochromis niloticus and investigate hazards effect on fish. The data revealed a significant accumulation of LAS in Burullus and Edku water, sediments, and fish muscle compared to those recorded in the Nile River as a reference site. The study showed seasonal changes in the serum concentrations of superoxide dismutase (SOD), catalase (CAT) and glutathione reductase (GSH) for fish tilapia. The ANOVA test displayed a significant difference between different seasons (p ≤ .001). The results of the current study exhibited the effect of increasing the concentration of LAS on the fishes of Burullus and Edku lagoons. The study showed low concentrations of serum activity, CAT, SOD and GSH in comparison with the values in the control fish (Nile River fish). It causes oxidative stress, severe disruption, followed by cytotoxicity. In excessive production of reactive oxygen species, the serum of SOD, CAT and GSH are exploited for detoxification. Alterations in histopathological structure were observed in both Burullus, and Edku fish liver and gills compared to those in the control fish.