The removal of mercury using Penicillium sp. strain A4 and its toxic effects on fish

Abstract Mercury (Hg) is a heavy metal that commonly found in waters and sediments. its derivatives are highly toxic ) . Their presence the aquatic environment can be very detrimental. Aspergillus fungi known to reduce Hg levels pollutants. Our research aim was evaluate effect of after being reduced by local isolates Penicillium sp. strain A4. A toxicity test conducted on juvenile Caroline platyfish ( Xiphophorus maculatus ). The growing fungal potato dextrose broth (PDB) medium with addition at 7 days incubation. concentration measured before acute two serial concentrations: 50% 100% PDB-Hg media from removal, as well one control. carried out for 48 hours number deaths counted. results showed decrease mercury 3.14 ppm 0.797 activity A4 resulting 74.6% removal. Acute concentrations caused death fish. this study used initial data determine quality criteria waste containing discharged into river bodies strategies using applications A4, which has potential wastewater treatment effects.