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Aquaculture Studies 2020, Vol 20, Num, 1     (Pages: 45-54)

Growth Performance and Nutritional Quality of Nile tilapia Caged in Northern Benin Water Reservoirs Exposed to Agricultural Effluents

Rodrigue Orobiyi Edéya Pèlèbè 1-2 ,Ibrahim Imorou Toko 1 ,Issa Nahoua Ouattara 2 ,Eloi Yatchégnon Attakpa 3 ,Jean Fall 4 ,Elie Montchowui 5 ,Célestin Melecony Ble 6

1 Research Laboratory in Aquaculture and Aquatic Ecotoxicology, Faculty of Agronomy, University of Parakou, Benin
2 Laboratory of Hydrobiology and Water Ecotechnology, Biosciences Training and Research Unit, University of Félix HOUPHOUET-BOIGNY, Côte d’Ivoire
3 Laboratory of Animal Ecology, Health and Production, Faculty of Agronomy, University of Parakou, Benin
4 University Institute of Fisheries and Aquaculture, University Cheikh Anta Diop, Dakar, Senegal
5 School of Aquaculture of the Valley, National University of Agriculture, Benin
6 Aquaculture Department, Oceanology Research Center, Côte d’Ivoire
DOI : 10.4194/2618-6381-v20_1_06 Viewed : 1825 - Downloaded : 1381 Water reservoirs, widespread in northern Benin providing fish for consumption to the near-by population, are exposed to agricultural pesticides from cotton production. To highlight their aquaculture potential, a 120-days experiment was conducted on growth performance and nutritional quality of Oreochromis niloticus (7.00 ± 0.06 g). A 2 X 2 factorial design with water reservoirs (Batran and Songhaï chosen as site polluted by pesticides and a reference environment, respectively) and cage culture systems (Cage bottom on Seaground, CBOS and cage bottom above Seaground, CBAS) was used. Transparency and dissolved oxygen's means values were significantly higher in Songhaï (P<0.05) compared to Batran. Final survival rates are quite high and satisfactory (75- 99%). Only the water reservoir had a significant influence on fish growth. Fish reared in CBOS at Songhaï significantly displayed the highest values of final mean body weight (70.63 ± 9.90 g), daily weight gain (0.53 ± 0.08 g day-1) and specific growth rate (1.92 ± 0.11 %day-1), while the lowest values were found with the same culture system at Batran (45.62 ± 1.22 g, 0.32 ± 0.01 g day-1, 1.56 ± 0.02% day-1, respectively). Water reservoir location had a significant effect on lipid productive value, total ash and gross energy retention. Keywords : Oreochromis niloticus, Agricultural pesticides, Rearing performance, Water reservoirs, Benin