Etude comparée de la qualité physico-chimique de l’eau, de la croissance et de la survie de <i>Oreochromis niloticus</i> en système aquaponique et en circuit fermé classique

The aim of this trial was to compare the physicochemical characteristics of water, the survival rate and growth of Oreochromis niloticus under aquaponic and closed classical circuit. To achieve this aim, from March to April 2020, 230 adults of Oreochromis niloticus, with initial mean weight of 53.2 ± 1.03 g were randomly distributed in equal number into two concrete tanks corresponding to an Aquaponic System and Classical Closed system. The physicochemical characteristics were recorded every five days, and data for growth characteristics were collected after 15 days. After 45 days of rearing, the high of Capsicum chinense were measured and age of flowering plants noted. the mains results were as follows: Dissolved Oxygen values (9.0 ± 1.7 mg / l), ammoniac nitrogen (0.3 ± 0.05 mg / l) and nitrates (3.31 ± 0.7 mg / l) were higher in a closed classical circuit as compared to the aquaponic system, the final mean weight (118.3 ± 25.4 g), the mean weight gain (65.1 ± 28.3 g), the condition factor K (K = 3.8 ± 1.6) and survival rate (100% ) were higher in aquaponic system. The survival rate (91.0 ± 0.2 %) and the final high of Capsicum chinense (52.03 ± 0.5 cm) were higher and the flowering age  (30,0 ± 2,0 j) was very short in aquaponic system. The aquaponic system offers a better environment for life and growth to Oreochromis niloticus and Capsicum chinense as compared to the classical closed circuit.