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Background: The aim of this study was to assess the changes in plasma levels of antioxidant enzymes and melano-macrophage centers (MMCs) in immune tissues as biomarkers of yellowfin seabream (Acanthopagrus latus) exposed to phenanthrene (Phe) for 14 days. Methods: The research was carried out at Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran in Jan 2016. Thirty-six immature fish were intraperitoneally injected with coconut oil (10 μl/g-bw) containing Phe (70mg/kg-bw) and compared with control group (without injection). Then tissue and blood samples were obtained at 1, 4, 7 and 14 d after injection. Results: The SOD and CAT activity showed a significant decrease in fish exposed to Phe up to day 7, then activity increased at day 14 in Phe-treated fish (P<0.05). The size and number of MMCs in treated fish in spleen and head kidney were higher than control. Conclusion: Changes in these parameters (SOD, CAT, and MMCs) might be used as useful biomarkers for evaluating immunosuppressive Phe in fish.

iranian journal of toxicology

Response of Melanomacrophage Centers in Yellowfin Seabream (Acanthopagrus latus) Immune Organs as an Immunohistological Biomarker in Short-term Exposure to Phenanthrene