Risk assessment of glyphosate and malathion pollution and their potential impact on Oreochromis niloticus: role of organic selenium supplementation

Author:

Hassan Marwa A.ORCID,Hozien Samaa T.,Abdel Wahab Mona M.,Hassan Ahmed M.

Abstract

AbstractA field survey was conducted on five fish farms to trace glyphosate and malathion pollution with some physicochemical parameters. A precise half-life time, LC50-96h, of these agrochemicals on Oreochromis niloticus, as well as chronic exposure with organic selenium (OS) supplementation, were experimentally investigated. Oreochromis niloticus was subjected to the following: (negative control); (2 mg L−1 glyphosate); (0.5 mg L−1 malathion); (glyphosate 1.6 mg L−1 and 0.3 mg L−1 malathion); (glyphosate 2 mg L−1 and OS 0.8 g kg−1 diet); (malathion 0.5 mg L−1 and OS 0.8 g kg−1 diet) and (glyphosate 1.6 mg L−1; malathion 0.3 mg L−1 and OS 0.8 g kg−1 diet). Furthermore, data from the analyzed pond revealed a medium risk quotient (RQ) for both agrochemicals. The detected agrochemicals were related to their application, and vegetation type surrounding the farms, also their biodegradation was correlated to water pH, temperature, and salinity. Glyphosate and malathion had half-lives of 2.8 and 2.3 days and LC50-96h of 2.331 and 0.738 mg L−1, respectively. The severest nervous symptoms; increased oxidative stress markers, as well as high bacterial count in the livers and kidneys of fish challenged with Aeromonas hydrophila, were observed in the combined exposure, followed by a single exposure to malathion and then glyphosate. Organic selenium mitigated these impacts.

Funder

Suez Canal University

Publisher

Springer Science and Business Media LLC

Subject

Multidisciplinary

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