The aim of the presented study was testing the efficacy of an herbal concoction in goldfish (Carassius auratus) experimentally infected with Aeromonas hydrophila. After an intramuscular injection of the pathogen, the scales sloughed off on the site of the injection, with an appearance of a muscular haemorrhagic protuberance, which progressed into an extensive ulcerative dermatitis associated with focal haemorrhage, oedema, and dermal necrosis exposing the underlying muscle. The progression of the disease affected organs in the following order: muscle, gills, liver, and finally the heart. The dip treatment with the 1% herbal concoction for 5 min daily restored the macro- and microscopical structure of the altered primary gill lamellae, liver, heart, and muscles. The recovery changes were described.
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