Breeding Potential of Adventitious Species of Carassius auratus and Carassius gibelio (Cypriniformes, Cyprinidae) in Water Bodies of Ukraine

Kokodiy, S. V.



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 diff erent generations of hatchlings, little number of individuals not participating in reproduction, prevailing number of fish eggs in femalesí 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 —arassius 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, —arassius carassius (Linnaeus, 1758).