Description of new and known myxozoans infecting wild indian fishes in uttar pradesh, India
Goswami Urvashi1,2, Cech Gábor1, Chaudhary Anshu2, Molnár Kálmán1, Singh Hridaya Shanker2, Székely Csaba1
1Institute of Veterinary Medical Research, Centre for Agricultural Research, Hungarian Academy of Sciences, Budapest
2Chaudhary Charan Singh University, Meerut, UP, India.
Abstract
Introduction
Myxozoans are highly specialized Metazoan parasites of aquatic animals with a rather strict host range. Parasites of this phylum have become increasingly important as new species are continually emerging as significant threats to the development of both farmed and natural environment fish. Molecular methods can refine the traditional taxonomy of these parasites. In India, molecular tools were applied only recently in Myxozoan studies, therefore only a few data are available in the GenBank regarding Myxozoan species from India.
Objectives
During the present study our aim was to find myxospores of Myxozoan spp. parasitizing selected fish species at the sampling sites in India and to make attempts for identifying their invertebrate alternate hosts. An additional purpose was to follow their developmental cycle in experiments and characterize their seasonal occurrence.
Material and Methods
Our primary task was a survey on wild fishes infected with myxozoans in the tributaries of River Ganga at the district of Hastinapur and Bijnor, Uttar Pradesh, India in 2017-2018. Collected samples were proceeded according to Székely et al, 2015. For better identification, using of molecular techniques were planned to compare 18S rDNA sequences of the observed species.
Results
A new Myxobolus species, Myxobolus ompok n. sp. (70.3% prevalence) was found in the kidney tissue of Ompok pabda (Siluridae). Infection was found only in the kidney. The detailed examination of Pabdah catfish specimens demonstrated no major signs of abnormalities, such as lesions, bruising, or deformities, but in some of the fish, heavy infection of the kidneys with an unknown species of Myxobolus Bütschli, 1892 was found. Another already known species, identified as M. cylindricus (78.5% prevalence) was recorded from gill lamellae of Channa gachua (Channidae). Besides Myxobolus spp. two Henneguya spp. (72% and 81.2% prevalence, respectively) were found from gill lamellae of Notopterus notopterus (Notopteridae) and Mystus vittatus (Bagridae). Regarding some less studied Myxozoans, two species of Myxidium genus. (66% and 60% prevalence respectively) were found from the kidney tissue of Channa punctata (Channidae) and Monopterus cuchia (Synbranchidae) and a Myxobilatus sp. (60% prevalence) was recorded from kidney tissue of Anabas testudineus (Anabantidae). Mesurements and molecular results will be shown in presentation.
Conclusion
During the survey of myxozoan parasites of fresh water fishes in India we found Myxobolus ompok n. sp. from the kidney tissue of Ompok pabda, M. cylindricus from the gill lamellae of Channa gachua. In addition, two Henneguya spp. were found from gill lamellae of Notopterus notopterus and Mystus vittatus. Other myxozoans, Myxidium sp. were found from the kidney tissue of Channa punctata and Monopterus cuchia. One Myxobilatus sp. was found from kidney tissue of Anabas testudineus. At present, analyses of 18S rDNA sequences are in progress for a proper identification of a new species as well as for redescription of already existing myxozoan species.
Keywords: Myxozoans, 18S rDNA, Fish, River Ganga, India.
Acknowledgements
The work was supported by SZIU Stipendium Hungaricum Scholarship for UG and the European Regional and Development Fund and the Government of Hungary within the project GINOP-2.3.2-15-2016-00025.
References
Kalavati C, Nandi NC (2007). Handbook on myxosporean parasites of Indian fishes. Zoological Survey of India, Kolkata, India
Kaur H, Dar SA, Singh R (2013). On new and three already known myxosporean parasites of Indian major carps in Punjab (India). Species 4:17-24
Lom J, Arthur JR (1989). A guideline for the preparation of species descriptions in Myxosporea. J Fish Dis 12:151-156
Singh R, Kaur H (2012). Biodiversity of myxozoan parasites infecting freshwater fishes of three main wetlands of Punjab, India. Protistology 7:79-89
Székely, C., Cech, G., Chaudhary, A., Borzák, R., Singh, H. S., & Molnár, K. (2015). Myxozoan infections of the three Indian major carps in fish ponds around Meerut, UP, India, with descriptions of three new species, Myxobolus basuhaldari sp. n., M. kalavatiae sp. n. and M. meerutensis sp. n., and the redescription of M. catlae and M. bhadrensis. Parasitology Research, 114, 1301–1311.
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