This work is a comparative study of two environments, the Oubeira and Tonga Lakes, regarding the influence of the physicochemical parameters on the biometric parameters (weight, size and biometric indices) and the parasitic infestation of the carp Cyprinus carpio. The physicochemical parameters characterized by turbidity and suspended matter are important in Tonga Lake compared to Oubeira Lake. This influence showed a negative allometric growth, while an important infestation was recorded by copepods (a negative correlation with monogenes and some biometric parameters such as GSI, HSI and ISS). The carp (C. carpio) of Lake Tonga is strongly infested by Monogenes and a high rate of the parameters GSI, HSI and ISS. While, the carp of the lake of Oubeira is characterized by a strong infestation by copepods and low rates of GSI, HSI and ISS