The parasitofauna of the Siberian sterlet Acipenser ruthenus marsiglii of the Lower Irtysh
Abstract
In the Ob-Irtysh basin, studies on the parasitofauna of the Siberian sterlet are very limited and confined to the middle of the twentieth century. The decrease in the numbers of sterlet over the past half century may have led to a change in the qualitative and quantitative composition of the parasitofauna. The aim of this work is to study the parasitofauna of the Siberian sterlet in the rivers Irtysh and Tobol. 85 specimens of Siberian sterlet (L = 27.8–51.5 cm, 2+ – 6+) from the Tobol and Irtysh rivers were examined by the method of complete parasitological dissection during the periods from 5 to 21 June and from 14 to 22 July 2017. A comparison of the biodiversity of parasites was performed using the indices: Berger-Parker. 11 species of parasites were found, including four species specific to sturgeons: Cryptobia acipenseris (Joff, Lewashow, Boschenko, 1926), Haemogregarina acipenseris (Nawrotzky, 1914), Crepidostomum auriculatum (Wedl, 1858), Capillospirura ovotrichura (Skrjabin, 1924). Seven broadly specific species: Trichodina sp., Proteocephalus sp. (plerocercoids), Diplostomum chromatophorum mtc. (Vrown, 1931), Echinorhynchus cinctulus (Porta, 1905), Piscicola geometra (Linnaeus., 1761), Ergasilus sieboldi (Nordmann, 1832), Unionidae gen. sp. Cryptobia acipenseris and H. acipenseris were recorded for the first time in the Ob-Irtysh basin. C. acipenseris was found only in three fish from the total number of examined sterlet (3.5%). In the River Tobol the extent of infestation H. acipenseris was higher (22.7%) than in the River Irtysh 11.1%. The carriers of C. acipenseris and H. acipenseris in the Lower Irtysh are allegedly leeches of Piscicola geometra (10.6%). The most common parasites found were C. auriculatum (32.9%) and C. ovotrichura (15.3%). In the River Irtysh, metacercariae of Diplostomum chromatophorum (Vrown, 1931) (metacercariae) were discovered in the lens of the eye in the studied fish. The maximum EI of this parasite was noted in the fish sample near the city of Tobolsk – 12.5% with AI – 1 and IO – 0.12. In the Gornoslinkino area in June and July, the infection level was low (EI 4.3% and 8.3%, respectively). In the June sample of fish from the River Tobol no metacercariae of this species were detected. Single cases of infection of Proteocephalus sp. (plerocercoid), E. cinctulus, E. sieboldi, Unionidae gen. sp. were found. In the River Irtysh the parasitofauna was dominated by C. ovotrichura, in the River Tobol – C. auriculatum. The number of parasite species noted in the Siberian sterlet in the Ob-Irtysh basin according to our own and literary data is greater than that found in sterlet from the River Yenisei: 18 and 11 respectively. Common to the sterlet of the two basins are 8 species of parasites: Cryptobia acipenseris, Diclybothrium armatum, Crepidostomum auriculatum, Capillospirura ovotrichuria, Truttaedacnitis clitellarius, Echinorhynchus cinctulus, Piscicola geometra, Unionidae gen. sp. The fauna of the Ob-Irtysh basin was enriched by the "southern" narrowly specific parasite of sturgeon – H. acipenseris. For many years the infection of C. auriculatum has practically not changed.References
Bauer, O. N. (1948). Parazity ryb r. Enisej [Fish parasites of the Yenisei River]. Izvestiya VNIORH, 27, 97–157 (in Russian).
Bauer, O. N. (1959). Biologiya Diclybothrium armatum Leuckart (Monogenoidea) – parazita osetrovyh ryb [Biology of Diclybothrium armatum Leuckart (Monogenoidea) – sturgeon parasite]. Voprosy Ekologii, 3, 142–153 (in Russian).
Byhovskaya-Pavlovskaya, I. E. (1985). Parazity ryb. Rukovodstvo po izucheniiyu [Fish parasites. Study Guide]. Nauka, Leningrad (in Russian).
Caira, J. N. (1989). A revision of the North American papillose Allocreadiidae (Digenea) with independent cladistic analyses of larvaland adult forms. Bulletin of the University of Nebraska State Museum, 11, 1–58.
Dobrohotova, O. V. (1960). Parazity ryb oz. Zajsan [Fish parasites of the lake Zaisan]. Trudy Instituta Zoologii Kazahskoj SSR, 14, 109–127 (in Russian).
Dubinin, V. B. (1952). Parazitofauna molodi osetrovyh ryb Nizhnej Volgi [Parasitofauna of juvenile sturgeon fish of the Lower Volga]. Uchenye Zapiski LGU. Seriya Biologicheskie Nauki, 141, 238–251 (in Russian).
Fedotkina, S. N., & Shinkarenko, A. N. (2015). Vopros izucheniya gel'mintofauny sterlyadi vodoemov Volgogradskoj oblasti [The study of the helminthofauna of sterlet reservoirs in the Volgograd Region]. Teoriya i Praktika Parazitarnyh Boleznej Zhivotnyh, 16, 453–455 (in Russian).
Ivanov, V. P. (1968). Parazitofauna osetrovyh ryb pri estestvennom i iskusstvennom ih vosproizvodstve v izmennenoj Volge [Parasitofauna of sturgeon fishes with natural and artificial reproduction in the changed Volga]. Volgograd (in Russian).
Izyumova, N. A. (1977). Parazitofauna ryb vodohranilishch SSSR i puti ee formirovaniya [Parasitofauna of fish in reservoirs of the USSR and ways of its formation]. Nauka, Leningrad (in Russian).
Kazarnikova, A. V., & Shestakovskaya, E. V. (2006). Sravnitel'nyj analiz fauny parazitov osetrovyh ryb Azovskogo i Kaspijskogo bassejnov. Ehkosistemnye issledovaniya sredy i bioty Azovskogo moria [Comparative analysis of fauna of parasites of sturgeon fish of the Azov and Caspian basins. Ecosystem research of the environment and biota of the Sea of Azov]. MMBI RAN, YUNC RAN, Murmansk, Apatity. Pp. 252–263 (in Russian).
Lyubarskaya, O. D., & Lavrent'eva, Y. I. (1985). Parazitofauna sterlyadi Srednej Volgi i Kujbyshevskogo vodohranilishcha [The parasitofauna of the sterlet of the Middle Volga and the Kuibyshev reservoir]. Parazitologiya, 19(4), 320–323 (in Russian).
Moravec, F. (2013). Parasitic nematodes of freshwater fishes of Europe. Academia, Praha.
Opredelitel' parazitov presnovodnyh ryb fauny SSSR (1984). Paraziticheskie prostejshie [The determinant of parasites of freshwater fish of the USSR (1984). Parasitic Protozoa]. Nauka, Leningrad. Vol. 1 (in Russian).
Opredelitel' parazitov presnovodnyh ryb fauny SSSR (1987). Paraziticheskie mnogokletochnye [The determinant of parasites of freshwater fish fauna of the USSR. Parasitic multicellular]. Nauka, Leningrad. Vol. 3 (in Russian).
Pazooki, J., & Masoumian, M. (2004). Cryptobia acipenseris and Haemogregarina acipenseris infections in Acipenser guldenstadti and A. persicus in the southern part of the Caspian Sea. Journal of Agricultural Science and Technology, 6, 95–101.
Perekropov, T. I. (1930). Haemogregarinen beim Wolga und Kama Sterlet (Acipenser ruthensis). Zentralblatt für Bakteriologia, 80, 253–259.
Petrushevskij, G. K., Mosevich, M. V., & Shchupakov, I. G. (1948). Fauna parazitov Obi i Irtysha [Fauna of the parasites of the Ob and the Irtysh]. Izvestiya VNIORH, 27, 67–97 (in Russian).
Razmashkin, D. A. (1976). O lichinkah trematod, parazitiruyushchih u ryb vodoemov Ob'-Irtyshskogo bassejna. Bolezni i parazity ryb Ledovitomorskoj provincii (v predelah SSSR) [On the larvae of trematodes parasitizing fish of the reservoirs of the Ob-Irtysh basin. Diseases and parasites of fish from the Arctic Ocean (within the USSR)]. Sverdlovsk. Pp. 80–103 (in Russian).
Shul'man, S. S. (1954). Obzor fauny parazitov osetrovyh ryb [Overview of fauna of parasites of sturgeon]. Zoologicheskij Zhurnal, 33(1), 190–254 (in Russian).
Skryabina, E. S. (1974). Gel'minty osetrovyh ryb (Acipenseridae Bonaparte, 1831) [Helminths of sturgeon fishes (Acipenseridee Bonaparte, 1831)]. Nauka, Moscow (in Russian).
Titova, S. D. (1965). Parazity ryb Zapadnoj Sibiri [Fish parasites of Western Siberia]. Izdatel'stvo Tomskogo Universiteta, Tomsk (in Russian).
Volkova, M. M. (1941). Parazitofauna ryb bassejna r. Obi [Parasitofauna of fish in the Ob River Basin]. Uchenye Zapiski LGU, 74(18), 20–36 (in Russian).
Zahvatkin, V. A. (1938). Parazitofauna ryb oz. Zajsan i r. Chernogo Irtysha [Parasitofauna of fish of the Lake. Zaisan and the river. Black Irtysh]. Uchenye Zapiski Permskogo Universiteta, 3(2), 193–249 (in Russian).
Zhuravlev, V. B. (2000). K voprosu o taksonomicheskom statuse sterlyadi Acipenser ruthenus reki Obi [On the question of the taxonomic status of the sterlet Acipenser ruthenus of the Ob River]. Izvestiya Altajskogo Gosudarstvennogo Universiteta, 3, 77–88 (in Russian).
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