Metals concentrations and ecological risk assessments of fish farms sediments in Kafr El-Shaikh, Egypt. | ||
| Egyptian Journal of Aquatic Biology and Fisheries | ||
| Article 23, Volume 26, Issue 4, July and August 2022, Pages 377-393 PDF (779.67 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejabf.2022.250750 | ||
| Author | ||
| Nashwa A. Shaaban et al. | ||
| Abstract | ||
| As a result of the freshwater sacristy and growing demands for fish production, the usage of fresh Nile water (Ri-W) for fish cultivation has been banned and replaced by the usage of agricultural drainage water (ADW). The agricultural drains collect wastewater from various sources that pose a potential for metal pollution. Subsequently, affect the quality of water and sediments of the receiving fish farm and poses health hazards to cultured fish and man. Farms’ sediments act as a reservoir for metals and an internal source of metal. Thus, the evaluation of its metal contents and their indications are preferred for tilapia culture management. The present study investigates the levels of 7 metals (essential, and non-essential) in the surficial sediments of three fish farms irrigated with two different water sources (RiW, and ADW). Followed by an evaluation of sediment pollution and potential ecological risks using pollution indices (PI) and sediment quality guidelines (SQGs). The results indicated that the mean levels of the metals at the three fish farms follow the decreasing order of Fe (> 50,000 ppm) > Mn (700 ppm) > Zn (110 ppm) > Cr (75 ppm) > Cu (55 ppm) > Cd = Pb (not detected). According to PI, all metals were depleted to mineral levels (enrichment factor (EF) < 2) and showed unpolluted status and almost at baseline levels (̴ 1) relative to geo-accumulation index (I geo), contamination factor (CF), and pollution loading index (PLI). According to ecological risks, the adverse effects due to Zn and Mn were unlikely to be noticed, in contrast, a slight risk may occur due to Cu, and Cr. There were no restrictions on using ADW for fish cultivation, where sediments were not considered a source of secondary metal pollution. Continuous monitoring and evaluation of the pollution status of farm sediments are recommended. | ||
| Keywords | ||
| Fish Farms; Sediments; Metals; Pollution indices; Sediment Quality Guidelines | ||
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