Karyotype, morphology, and reproduction ability of the Prussian carp, Carassius gibelio (Actinopterygii: Cypriniformes: Cyprinidae) from unisexual and bisexual populations in Poland

• Autorzy: Boron A. , Szlachciak J. , Juchno D. , Grabowska A. , Jagusztyn B. , Porycka K.
• Języki publikacji: EN

Abstrakty

EN

Background. The majority of the European populations of the Prussian carp, Carassius gibelio, consist predominantly of females reproducing by gynogenesis but include a small portion of males. Mechanisms for the occurrence of males in natural populations and their functions are still unclear. The aims of this study were to show the ploidy level by karyotype, some taxonomic characteristics by analysis of morphology, and the reproductive potential by histology of gonads of Prussian carp individuals of a certain age from two types of naturally existing unisexual triploid and a diploid-polyploid populations. Materials and methods. In total 31 specimens from three different populations inhabiting the Vistula River basin, the Baltic Sea watershed, have been analyzed. Kidneys were used to prepare chromosome slides using standard procedures. Air-dried slides were stained with Giemsa solution. For each fish, 23 metric characteristics of the body were measured. Selected meristic characteristics (external and internal) were determined. The gonads were fixed in buffered formalin or in Bouin’s solution; histological sections were stained with haematoxylin and eosin (HE). The developmental stages of germ cells and gonads were determined according to Rinchard and Kestemont and Billard. Results. All individuals of two populations were triploid females with high chromosomal variability from 150 to 160 chromosomes (and microchromosomes). Among individuals of the third population, males and females of 2n = 100 and one triploid male 3n = 160 (151–162) chromosomes were detected. The individuals from analyzed populations differed in the number of: branched rays in the dorsal fin, lateral line scales, serration in dorsal D and anal A fin rays, and vertebrae. Gonad histology of the ovaries indicated the females were mature at the age of 3. Testes morphology of diploids and one triploid male indicated their reproductive abilities. Conclusion. The results of the study confirmed the tendency to increase the number of males in C. gibelio populations. In several or some populations apart from diploid males a small number of fertile triploid males occur. High chromosomal variability within the females from unisexual populations may be influenced by their different mode of origin. The future research should be focused on karyological identification of other C. gibelio populations to explain the origin of triploid males and their role in reproduction.

Słowa kluczowe

EN

karyotype; morphology; reproduction ability; Prussian carp; Carassius gibelio; Actinopterygii; Cypriniformes; Cyprinidae; unisexual population; bisexual population; Poland; gonad; histology; male; polyploidy

• Wydawca: -
• Czasopismo: Acta Ichthyologica et Piscatoria
• Rocznik: 2011
• Tom: 41
• Numer: 1
• Opis fizyczny: p.19-28,fig.,ref.

Twórcy

autor

Boron A.

• Division of Zoology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland

autor

Szlachciak J.

autor

Juchno D.

autor

Grabowska A.

autor

Jagusztyn B.

autor

Porycka K.

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