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Distribution of heavy metals concentrations: (A) Co, with the highest concentration detected in U4, U3, and U2 sediment samples, (B) Cr, most abundant in small nursery ponds S1, S2, and U4, U5, U3, U8, (C) As, mostly detected in the sediments from the main pond at B8, B7, B6, and U2 sampling point from the unused pond, (D) Cu, prevalent in all the testes ponds, highest concentrations determined in U4, U5, U3, B3, B7, U8, S1 and S2 locations.
