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Natsionalnoyi Akademiyi Nauk Ukrayini, 7, 169–74 [In Russian]. Mezhzherin, S. V., Kokodiy, S. V. 2008. The polyclonal structure of European silver crucian carps Carassius auratus s. lato in the water bodies of Ukraine. Dopovidi Natsionalnoyi Akademiyi Nauk Ukrayin, 7, 162–169 [In Russian]. Mezhzherin, S. V., Kokodiy, S. V. 2009. Morphological variability and differentiation bisexual ( Carassius auratus L. 1758) and unisex ( C. gibelio Bloch) silver crucians in reservoirs of Ukraine. Vestnik Zoologii , 43 (1), 39–50 [In Russian]. Mezhzherin, S. V., Kokodiy, S. V

Abstract

The following proofs of Goldfish more powerful reproductive potential are given: high individual and relative fecundity, adequate fractional spawning process resulting in numerous off spring, represented by different generations of hatchlings, little number of individuals not participating in reproduction, prevailing number of fish eggs in females’ ovaries, larger fraction of impregnated roe. All the above mentioned factors allow claiming that the Prussian carp is being replaced due to its low replacement ability. Perhaps for that reason Carassius gibelio (Bloch, 1782) choose small isolated water bodies, where it makes small populations, backed up by successful spawning with a single male of crucian carp, Carassius carassius (Linnaeus, 1758).

- carassius of cyprinid fishes (Cyprinidae) in the fauna of Ukraine. Dopovіdі NANU , 12, 162–166 [In Russian]. Mezhzherin, S. V., Kokodiy, S. V. 2009. Morphological variability and differentiation of bisexual Goldfish ( Carassius auratus L. 1758) and same-sex Prussian carp ( C. gibelio Bloch 1782) carp in Ukrainian reservoirs. Vestnik Zoology , 43 (1), 39–50 [In Russian]. Mezhzherin, S. V., Kokodiy, S. V. 2010. The genetic structure of the settlements of Prussian carp Carassius (superspecies auratus ) (Linnaeus, 1758) of the Middle Dnieper basin. Genetica , 46