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The amyloodiniosis outbreak was documented with high mortality of percula clownfish ( Amphiprion percula ) and subsequently, various therapeutics were evaluated to control the infection. The affected fish exhibited symptoms such as discoloration of the skin and jerky movement with severe respiratory stress. Microscopic examination of the gill and body surface of the infested moribund fish showed the presence of brown coloured spherical shaped trophonts with the size range of 150-300 µM. Copper sulphate (10 ppm) and hydroxychloroquine phosphate (10 ppm) treatment with 14 days of continuous bath showed 76 ± 5.3 and 66 ± 4.3% survival rates. However, formalin (10 ppm) and malachite green (10 ppm) treated groups showed a survival of 41 ± 1.7 and 32.7 ± 1.2% respectively. The present results suggest that, use of copper sulphate to treat amyloodiniosis in clownfish will relatively more effective than other treatment options. The findings will be helpful to mitigate amyloodiniosis in marine finfish aquaculture, particularly marine ornamentals., Competing Interests: Conflict of interestThe authors declare that they have no conflict of interest., (© Indian Society for Parasitology 2022, Springer Nature or its licensor holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.)