Environmental toxicity assessment of engineered nanoparticles manifest histo-hemato alterations to fresh water fish.

The present study rigorously examined the toxicological effects of nanoparticles (NPs), specifically nickel (Ni) and chromium oxide (Cr ₃ O ₄ ) NPs, synthesized under controlled conditions and characterized. To evaluate their potential environmental impact exposed the freshwater fish Labeo rohita ( L. rohita ) to environmentally relevant concentrations of both NPs within a controlled laboratory conditions. Vital organs, including gills and liver were subjected to histopathological analysis, revealing profound alterations in tissue architecture that were distinctly correlated with pathological damage. The lesions exhibited moderate to severe changes that are further correlated with the semi-quantitative mean alteration value (MAV). Furthermore, conducted a quantitative assessment of tissue-specific morphological changes. Notably, there was a significant reduction in critical hematological changes, including red blood cell (RBC) and white blood cell (WBC) counts, hemoglobin concentrations and other parameters. All of which exhibited significant fluctuations in relation to increasing NPs concentrations. These findings underscore the critical necessity for continued investigation into the ecological risks associated with these nanoparticles.