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Determination of some heavy metals content in the body of two popular fish species O.niloticus and L. niloticus, in lake Nubia, Wadi Halfa, Sudan 


Journal of Aquaculture & Marine Biology
Mubarak Eisa AT,1 Ali Awad AM2

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Abstract

The study was conducted in Lake Nubia at far North of Sudan to determine the meancontentvalues(ppm) of heavy metals, namely, (Hg, Pb, Cd, Cu, and Fe) in Nile Tilapia (O. niloticus) and Nile perch (L.niloticus)livers and muscles. Fish samples were collected from three main fishing sites in the lake Nubia from north to south: Eshkait, Gimai, and Semna fishing sites, respectively, twice a year during the winter and hot rainy summer seasons of 2016 and 2017. Samples were analyzed for determining the level of heavy metal sex cluding Hgusing the Atomic Absorption apparatus(NOBAA350, ENGLAND). Direct Mercury Analyzer apparatus (DMA-80, USA) was used to determine Hg. Laboratory analysis results of samples were subjected to statistical analysis using SPSS version16 and means were compared to detect significant differences using the multifactorial method in three different study sites regardless of how high the concentration. The highest Hg level in O. niloticus muscles was found in the Gimai fishing site. The lead level was significantly high in L.niloticus liver in the Eshkait fishing site. The highest levels of Hg, Pb, and Cu might reflect the local mining activity nearby to the southern part of the lake and use of bad quality of Pb in fishing nets at Eshkait.

Keywords

lake nubia, heavy metals, fishing sites, O.niloticus, L.niloticus, hot zone, biodiversity, mining workers, desert zone, air temperature

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