The paper performs a comparative analysis of some biometric (total length, standard length, head length and caudal footstalks length) in two cultured cyprinids species grown in a controlled system, namely: Aristichthys nobilis (bighead carp) and Hypophthalmichthys molitrix (silver carp), of various ages (starting with the first up to the fourth growth summer). The results obtained evidenced that, along the four growing stages, the representatives of Hypophthalmichthys molitrix show slightly higher values than those of Aristichthys genus for the total and standard bodily length, while for the head length the situation is reversed.