The aim of the study was to analyze the impact feeding has on the biometric characters of Crucian carp, Carassius carassius. Juvenile crucian carp were reared for 56 days in a recirculating aquaculture system (water temperature 24°C) and fed dried Chironomidae larvae (group O), commercial feed (group P), and a mix of these two feeds (group M). The type of feed has a significant impact on most of the biometric characters studied. Only the relative head size and head height were similar in all the feeding groups studied (P > 0.05). Discrimination analysis confirmed that the characters that most statistically significantly characterized the differences among the Crucian carp feeding groups studied were body height and tail stalk length.