scholarly journals Розподілення метацеркаріїв Paracoenogonimusovatus (Trematoda, Cyathocotylidae) у м’язовій тканині прісноводних риб

2015 ◽  
pp. 95-98
Author(s):  
С. Л. Гончаров
Keyword(s):  
Rutilus Rutilus ◽  
Esox Lucius ◽  
Abramis Brama ◽  
Sander Lucioperca ◽  
Roach Rutilus Rutilus ◽  
Dorsal Fin ◽  
Scardinius Erythrophthalmus ◽  
Carassius Gibelio ◽  
Bream Abramis Brama ◽  
Minimum Number

Досліджено розподілення метацеркарії в трема-тод Paracoenogonimus ovatus (Katsurada, 1914) ум’язовій тканині популяції прісноводних риб, а саме:тарані (Rutilus rutilus), густери (Blicca bjoerkna), ляща(Abramis brama), карася (Carassius gibelio), червоно-пірки (Scardinius erythrophthalmus), щуки (Esox lucius),судака (Sander lucioperca). Показано, що максималь-на кількість метацеркаріїв P. ovatus локалізувалася уділянці спинних м’язів, а саме поблизу спинного плав-ця та становила 41,3 % від загальної кількості вияв-лених паразитів. Мінімальні показники кількості ме-тацеркаріїв трематоди спостерігали в ділянці аналь-ного плавця – 2,1 %.  The distribution of metacercariae of trematodes Paracoenogonimus ovatus (Katsurada, 1914) in the muscle tissue of the population of freshwater fish, such as: roach (Rutilus rutilus), silver bream (Blicca bjoerkna), bream (Abramis brama), crucian (Carassius gibelio), rudd (Scardinius erythrophthalmus), pike (Esox lucius), pikeperch (Sander lucioperca). It is shown that the maximum number of metacercariae P. ovatus was localized in the dorsal muscles, namely near the dorsal fin and amounted to 41,3 % of the total number of identified parasites. The minimum number of indicators fluke metacercariae is observed in the anal fin – 2,1 %.    

scholarly journals The Occurrence of Paracoenogonimus Ovatus (Trematoda, Cyathocotylidae) in Fish of Natural Reservoirs of Mykolaiv Region

2015 ◽  
Vol 49 (5) ◽  
pp. 421-426
Author(s):  
S. L. Goncharov ◽  
N. M. Soroka
Keyword(s):  
Infection Intensity ◽  
Rutilus Rutilus ◽  
Esox Lucius ◽  
Original Material ◽  
Abramis Brama ◽  
Sander Lucioperca ◽  
Roach Rutilus Rutilus ◽  
Scardinius Erythrophthalmus ◽  
Bream Abramis Brama ◽  
The City

The article presents the original findings of Paracoenogonimus ovatus (Katsurada,1914) in fish in the Southern Bug and the Inhul rivers in Mykolaiv Region in 2012-2014. The roach (Rutilus rutilus), silver bream (Blicca bjoerkna), bream (Abramis brama), crucian (Carassius gibelio), rudd (Scardinius erythrophthalmus), pike (Esox lucius), pikeperch (Sander lucioperca) were found to be infected with metacercariae of P. ovatus. Metacercariae of P. ovatus are described based on the original material. The highest prevalence of infection was observed in the roach, 82.3 %, the pike was infected in the less degree, with prevalence of 15.3 %. The infection intensity was highest in the roach, up to 247 specimens; that of the pikeperch was the lowest - 17 specimens. The highest occurrence of P. ovatus was observed in the parts of the river Southern Bug in Zhovtnevy, Mykolaiv, Novoodesky Districts, whereas in Voznesenky, Pervomaysky Discticts and in the city of Mykolaiv the occurrence was the lowest. In the area of the river Inhul the parasite was observed mostly in the waters of Bashtansky District in Mykolaiv Region.

scholarly journals Asymmetric hybridization of roach Rutilus rutilus and common bream Abramis brama in controlled backcrosses: Genetic and morphological patterns

2020 ◽  
Vol 28 (4) ◽  
pp. 376-383
Author(s):  
V. V. Stolbunova ◽  
V. V. Pavlova ◽  
Y. V. Kodukhova
Keyword(s):  
Cytochrome B ◽  
Nuclear Dna ◽  
Morphological Variability ◽  
Genetic Material ◽  
Nuclear Genome ◽  
Rutilus Rutilus ◽  
F1 Hybrids ◽  
Abramis Brama ◽  
Roach Rutilus Rutilus ◽  
Bream Abramis Brama

In most cases in natural environments, hybrids of roach Rutilus rutilus L. and bream Abramis brama L. possess mitochondrial DNA of bream. Presumably, the genetic basis for unidirectional hybridization of roach and bream is the high level of divergence in the genes of the mitochondrial electron transport chain (cytochrome b and cytochrome c oxidase subunits I, III). Disruption of the interaction of the products of these genes leads to nuclear-cytoplasmic incompatibility of alien genomes, what is shown in a decrease of viability and developmental abnormalities in hybrids. In the present work we studied the viability and morphology of hybrid underyearlings obtained by crossing of hybrid females of first generation (RA and AR) with males of roach R. rutilus and bream A. brama. The method of genotyping (ITS1 ribosomal DNA, cytochrome b mtDNA) and comparative analysis of the complex of 23 plastic and meristic characteristics of backcrossed hybrids are used. All progenies showed an increase in morphological variability compared to parental species and F1 hybrids. In progenies with introgression of mtDNA, a violation of associations between traits and the formation of transgressive phenotypes that go beyond the parental populations were found. In RAA backcrosses (combining mtDNA of R. rutilus and nuclear genome of A. brama) a decrease in viability with impaired recovery of external traits of bream was found. Conversely, ARR backcrosses (combining mtDNA of A. brama and the nuclear genome of R. rutilus) have a high viability and completely restore the morphotype of roach, which indicates the stable development of hybrids when they include alien genetic material. The differences in viability and morphology between backcrossed hybrids with the mtDNA of R. rutilus and A. brama evidence varying degrees of nuclear-cytoplasmic compatibility of the genomes of roach and bream. The complete interaction between mitochondrial and nuclear DNA from different species (wild-type-like) happens in direction of introgression mtDNA of A. brama, the less polymorphic of the two parental genomes. In the direction of introgression of highly polymorphic mtDNA of R. rutilus the formation of a reproductive barrier occurs. Our results show that the main reason for the asymmetry of hybridization of R. rutilus and A. brama is unequal rates of mitochondrial evolution and the priority of the introgression of mtDNA belongs a species with a lower rate of changes in mtDNA.

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