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The present work was aimed at determining the population structure of silver Prussian carp (Carassius gibelio) populations that inhabit two anthropogenically polluted water basins from the region of the town of Galabovo (Southern Bulgaria) – the river Sazliyka (Population A) and the Rozov Kladenets reservoir (Population B). Total of 558 specimens from the river Sazliyka and 1004 specimens from the Rozov Kladenets reservoir were caught with fishing nets (cast or throw net) every month during April-October 2011. The sex composition of the C. gibelio population from the river Sazliyka was 99.64% females and 0.36% males; and the maximum age group III. In the population from the Rozov Kladenets reservoir, the sex composition was 99.30% females and 0.70% males; the maximum age group – VI. Standard length and total weight of the specimens from Population A ranged from 8.7 to 22.6 cm and 22.7 to 163.5 g. Standard length and total weight of the specimens from Population B ranged from 9.8 to 26.6 cm and 28.5 to 318.3 g. CF values in female individuals from all age groups of C. gibelio population from the river Sazliyka were statistically significantly lower than these in female individuals from the respective age groups in the population from the Rozov Kladenets reservoir.

trakia journal of sciences

Analysis Of Size-Age, Sexual Structure And Condition Of Populations Of Carassius Gibelio (Pisces: Cyprinidae) From Two Water Basins In Galabovo Region (Southern Bulgaria)