Investigation of external and internal parasitic infestations in ornamental severum (Heros severus)
2024
H. Rahmati-Holasoo | A. Marandi
The severum (Heros severus Heckel, 1840) is basically known as one of the beautiful fish species of cichlidae of Amazon River, which is very common in our country for breeding and reproduction. The aim of this study was to investigate the external and internal parasitic infections of the ornamental severum in ornamental fish trade centers in the country. In the summer of 1403, a random sampling was carried out and a total of 100 severum fish with a length of 7 to 12 cm were collected from 10 ornamental fish centers. The fish were referred to the Ornamental Fish Clinic of the Faculty of Veterinary Medicine, University of Tehran in fish carrying bags with the same water as the sampling site. In order to investigate the parasitic infection, wet smears were prepared from external organs (such as skin and gills) and then examined under a light microscope. Then, the fish were euthanized and necropsied under sterile condition. The bacterial culture result was negative. internal organs were also investigated for parasitic infestations. In the examination of the skin and gills, parasitic infection with 3 different genera including Trichodina, Ichthyophthirius multifiliis and Ancyrocephalus were observed. Also, in the microscopic examination of the intestine, infection with the protozoan parasite Hexamita, eggs and parasites of the nematode Capillaria, were observed. Considering the potential of some of the mentioned parasites in causing extensive losses, accurate and timely diagnosis of various infections caused by protozoa, monogeneans, cestodes and nematodes in ornamental fish including cichlids can be of great importance in preventing the occurrence of diseases and losses in these fish.
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