taxonomic comments. Academic publishing society KMK, Moscow, 1-389 [In Russian]. Cherfas, N. B. 1966. Analysis of meiosis of unisexual and bisexual crucian carp. Tr. VNIIPRKh, 14, 68-82 [In Russian]. Golovinskaya, K. A., Romashov, D. D., Cherfas, N. B. 1965. Unisexual and digeneous forms of thePrussiancarp (Carassius auratus gibelio Bloch). Journal of Ichthyology, 5, 1, 614-629 [In Russian]. Goriunova, A. I. 1974. Cytomertic blood analysis’ application in studying the intraspecific differenciation of thePrussiancarp Carassius auratus gibelio (Bloch). Journal of
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).
. Academie Verlag, Berlin. 5. Auflage.  Schuster, R., Wanjek, K., Schein, E. (2001) Investigations on the occurrence of muscle metacercariae in the roach (Rutilus rutilus) from Berlin waters. A contribution to the food hygienic importance of indigenous freshwater fish. Arch. Lebensm. hyg., 52: 102–104  Shukerova, S. (2005): Helminth fauna of thePrussiancarp, Carassius gibelio (Bloch, 1782), from the Srebarna biosphere reserve. Trakia J. Sci., 3: 33–40  Shukhgalter, O., Chukalova, N. (2002): An investigation of “black spot” disease of bream (Abramis brama