Abstract
Ichthyophoniasis is one of the most important systematic infections among different species of fishes that caused by Ichthyophonus hoferi. In the present study, we have reported this parasite from two species of ornamental fish, black tetra (Gymnocorymbus ternetzi) and tiger barb (Pentius tetrazona) in Ahvaz-Iran. Examined fishes had marked signs such as abnormal swimming, lethargy, swelling abdominal and low rate mortality. In this study, the two phases of life cycle of I. hoferi involving active and passive detected. The obvious internal sign was white cysts and nodules, which embedded in infected spleens. The cysts were full of schizonts that were surrounded by collagen fibers and many eosinophilic cells. Plasmodium spherical bodies with variable sizes were detected by microscopic examination of wet mount squash from the infected organs. In addition, histopathology studies showed that there were many granulation tissues surrounded by multilayer connective tissues in the infected tissues. Tissue samples were also isolated and put in to Minimum Essential Medium (MEM) to detect the germination of Ichthyophonus hoferi for distinguish Ichthyophoniasis from Mycobacterial infections.
Highlights
Ichthyophonus hoferi was first identified in cultured brown and brook trout in Germany by von Hofer in 1893
Infection to Ichthyophonus hoferi was found in internal organs of all examined aquarium fishes including five black tetra and two tiger barb
The result of our study demonstrated that the fishes were suffered from Ichthyophoniasis
Summary
Ichthyophonus hoferi was first identified in cultured brown and brook trout in Germany by von Hofer in 1893. Is reported in two cultured marine fish including Mugil capito and Lia salines from Spain [5]. This disease has records from over 80 species of both marine and freshwater fishes and results into mass mortalities and economic losses [6]. This parasite detected in several commercial fish [7]. In the case of aquarium fish, Ichthyophonus hoferi reported in sumatra barb (Systomus tetrazona) and black tetra (Gymnocorymbus ternetzi) by Reichenbach-Klinke, H in 1954 and 1955. The purpose of the present study is the description of the morphology and pathology of I. hoferi as found in two species of ornamental fish in Iran
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