Thelohanellus hovorkai - in female fish and carp fingerlings
2011
Milošević, N., Faculty of Agriculture, Novi Sad (Serbia) | Ćirković, M., Faculty of Agriculture, Novi Sad (Serbia) | Ljubojević, D., Faculty of Agriculture, Novi Sad (Serbia) | Adžić, B., Veterinary Diagnostic Laboratory, Podgorica (Montenegro) | Maletin, S., Faculty of Agriculture, Novi Sad (Serbia) | Bjelić-Čabrilo, O., Faculty of Sciences, Novi Sad (Serbia)
The subject of the investigation was myxosporidia detection in carps. In this paper, thelohanellosis of one-year old common carp fingerlings and spawning carp fish caused by Thelohanellus hovorkai is described. Investigations were conducted in the northern Serbia (Vojvodina Province) in 15 fish ponds during the period 2007-2009. All investigated fish ponds are provided by water from channel network, rivers Tisa, Tamiš, and Danube, and wells. Presence of Thelohanellus hovorkai was detected in common carp fingerlings older than 90 days and female carp fish. Infection intensity and number of T. hovorkai carriers differed among ponds. It has been noted that the most serious infections and the majority of infected fingerlings were from ponds where they were reared with older fish, ponds with natural spawning, and ponds which served for older carp winter storage. The spores of T. hovorkai were present in gills, skin, muscules, liver, spleen, kidneys, intestines, bile and swim bladder, spinal cord and brain where were present the highest number of spores. Spores were rounded by mucoid layer. Microscopic observation of compressed samples of brain tissue reveals small or large groups of spores. According to our investigations spores show next values: spore length 20-21 microm, spore width 14 microm, polar capsule length 12.5-14 microm polar capsule width 11.5-12.5 microm, spore length with mucal layer 22.5-25 microm, spore width with mucal layer 14.5-17.5 microm. Disease was manifested with disturbances in central nervous system, anemia, and absence of fingerlings progression especially when higher number of spores is diagnosticated.
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