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the Crucian carp Carassius сarassius (L. 1758) with the Prussian carp C. auratus (L. 1758) s. lato in the Dnepr basin. Ph.D thesis, Kyiv, 1-23 [In Ukrainian]. Kottelat, M. 1997. European freshwater fishes. An heuristic checklist of the freshwater fishes of Europe (exclusive of former USSR), with an introduction for non-systematics and comments on nomenclature and conservation. Biologia, Bratislava, 52, suppl., 1-271. Lusk, S. 2003. Rehabilitating the floodplain of the lower River Dyje for fish. River Research and Application, 19 (3), 281-288. Mezhzherin, S. V. 2008

genetic structure of communities of the crucian carp (Carassius Linnaeus, 1758) as a reflection of paradoxal reproductive relationships. Cytology and Genetics , 49 (2), 66–71 [In Russian]. Muhlfeld, C. C., Kovach, R. P, Jones, L. et al. 2014. Invasive hybridizationin a threatened species is accelerated by climate change. Nature Climate Change. DOI: 10.1038/nclimate2252 Qin, Q., Wang, J., Hu, M. et al. 2016. Autotriploid origin of Carassius auratus as revealed by chromosomal locus analysis. Science China Life Sciences, 59 (6), 622–626. Riley, S. P. N., Shaffer

Abstract

The analysis of present-day crucians’ settlements in water systems of Eastern Ukraine designated the predominance of the digeneous Goldfish, C. auratus, in the region, the number of which made 78.7 %, from the total number of the examined representatives of the genus. The second group consists of gynogenetic Prussian carps, C. gibelio (14.3 %); it is represented by the clone biotype and recombinant individuals. Crucian carp, C. carassius (3.6 %), turned out to be rare and its number did not exceed the number of the caught hybrids C. auratus × C. carassius (3.4 %). The retrospective analysis of literature data and museum collections gave an opportunity to describe the changes in species composition of the genus which took place during the last 150 years. Within this period the crucian carp, which used to be the single and most common representative of genus Carassius (Jarocki, 1822) in the region, became nearly an extinct species. In the meanwhile the representatives of the group of species of Prussian carps, C. auratus + C. gibelio, which appeared in the region in the late 1960s, rapidly increased their number and became the most numerous fish of the Eastern Ukraine. The discovered tendency is not unique for the researched region; in general it reflects the European tendency for the crucian species. The reasons for that are rivers’ regulation and destruction of bottomland ecosystems. The secondary factors for the elimination of C. carassius are the competitive relations of individuals representing both species and easy hybridization, during which the more numerous species C. auratus absorbs the rare C. carassius.

bioinvaders: profi les, distribution, and threats. Berlin, Germany: Springer, pp: 289 - 306 GALLI, P., STEFANI, F., BENZONI, F., ZULLINI, A. (2005): Introduction of alien host parasite complexes in a natural environment and the symbiota concept. Hydrobiologia 584: 293 - 299. DOI 10.1007/ s10750-005-3645-0 GRUPCHEVA, G. I., NEDEVA, I. L. (1999): Parasite fauna of the crucian carp (Carassius auratus gibelio Bloch) in the Zrebchevo reservoir (Bulgaria) Acta Zool. Bulg. 51: 115 - 122 GUSEV, A. V. (1985): Monogenea. In: BAUER, O. N. (Ed) Key to the parasites of the freshwater fi

effect of bleeding on peripheral blood and head kidney hematopoietic tissue in common carp (Cyprinus carpio) - Turk. J. Vet. Anim. Sci. 36: 169-175. Krča S., Žaja R., Čalić V., Terzia S., Grubešia M.S., Ahel M., Smital T. 2007 - Hepatic biomarker responses to organic contaminants in feral chub (Leuciscus cephalus) - laboratory characterization and field study in the Sava River, Croatia - Environ. Toxicol. Chem. 26: 2620-2633. Kutyrev I.A., Pronin N.M., Dugarov Z.N. 2011 - Composition of leucocytes of the head kidney of the Crucian Carp (Carassius auratus gibelio

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(Nosivskiy Region, Chernihiv District) in July 2013; Sl = 49.0–110 mm. Th ey comprised about 50 % of fi sh fauna. Th e remaining 50 % were the Crucian carp Carassius gibelio (Bloch, 1782). And only one specimen of the Tench Tinca tinca (Linnaeus, 1758), Sl = 90.0 mm was caught there. Th ese drainage channels are associated with fi sh ponds. We found that the Chi- nese sleeper migrated from them to the channels. We also inspected several other ponds around the channels and no one specimen of Perccottus glenii was found there. Two specimens of the Chinese sleeper were

, Pellerin J, Rainbow PS. (2006). Metallothioneins in aquatic invertebrates. Their role in metal detoxification and their use as biomarkers. Aquat Toxicol   76 : 160-202. Bae H, Nam SS, Park H-S, Park K. (2005). Metallothionein mRNA sequencing and induction by cadmium in gills of the crucian carp ( Carassius auratus ). J Health Sci   51 : 284-290. Baer KN and Thomas P. (1990). Influence of capture stress, salinity, and reproductive status on zinc associated with metallothionein-like proteins in livers of three marine teleost species. Mar Environ Res   29 : 277