دانلود مقاله Report of ectoparasitic protozoans from gill of imported common catfish, Hypostomus plecostomus in Iran
سال انتشار: ۱۳۸۷
محل انتشار: اولین کنگره بین المللی مدیریت بهداشتی و بیماریهای آبزیان
تعداد صفحات: ۱
B Shoaibi Omrani – Faculty of Veterinary Medicine, Islamic Azad University-Karaj Branch.Karaj,Iran;
H Ebrahimzadeh Mousavi – Department of Aquatic Animal Health, Faculty of Veterinary Medicine, University of Tehran, Tehran,Iran
B Jalali – Islamic Azad University, Science and Research branch,Veterinary Dept.,Tehran,Iran
I Sharifpour – Department of Fish Diseases, Iranian Fisheries Research Organization
Method & Materials: One hundred imported catfish (common pleco) from southeast Asia, that were held in 100 litres aquarium at 24ºc, that were studied in fish lab of Veterinary Medicine Faculty. Stereo microscope and wet mount observations were done on gills. First the parasites were found by wet mount and fixed by giemsa stain, then photo/film was taken by light microscopy from the parasites to confirm the genus through size and morphologic characteristics. In stereo microscopy, we used gill filaments and archs, then after finding any genus of parasites we counted their average quantity in each arch.
Results & Conclusion: A total of 100 plecos’ gill archs was examined under microscope, representing two ciliated protozoa parasites: Ichthyophthirius (ich) and Trichodina. On these fish, forty-three trichodinid parasites and thirty-four Ichthyophthirius were observed. In twenty-four plecos, both parasites were found. Literature review showed no article about these two parasites in Hypostomus plecostomus. Ectoparasitic protozoa are among the most important parasites of fish especially in aquaria. Their life cycles range from simple binary fission to the production of freeswimming, ciliated infective stages. Ich is one of the most common diseases of freshwater fish. Virtually all freshwater fish are susceptile to infection. Under aquarium conditions, it is particularly virulent. Predominant signs include small white spots over the body and gills. Parasite has a complex life cycle that includes stages on the host and in the environment. The development of the parasite is very temperature dependant; 3-4 days at 22ºc, up to 11 days at 15ºc, 30 days at 10ºc.Trichodinids are the most common ectoparasite of both freshwater and marine fishes and frequent in fish that are stressed (poor nutrition, overcrowding in aquaria,…).