Contribution à la promotion de la pisciculture intégrée de tilapia du Nil (Oreochromis niloticus, Linnaeus, 1758) par la valorisation des sous-produits agro-industriels et l'utilisation rationnelle des fertilisants animaux en République Démocratique du Congo
|Authors:||Tshinyama Ntumba, Albert|
|Advisor:||Vandenberg, Grant William; Khasa, Damase P.|
|Abstract:||Nile tilapia is one of the fresh water fish species that is best suited for low-input fish farming in tropical climate to alleviate food insecurity. The use of integrated aquaculture-agriculture (IAA) is a preferred approach for the sustainable development of rural aquaculture. This study was carried to assess the effects of feed and animal fertilizers (pig manure and duck droppings) on the physico-chemical and microbiological water quality, primary productivity of ponds, safety and fish growth, enzymatic digestibility of plant ingredients, feeding behaviour and production cost of Nile tilapia. The results showed that fertilization has influenced the physico-chemical properties of pond water without affecting negatively its quality. The best growth performance was recorded in fish fed with a formulated feed and those reared in fertilized ponds. Fertilization has improved primary productivity, with diatoms largely represented by a relative abundance of Flagilaria spp, the dominant prey in the stomach content of tilapia. Pretreatment of animal faeces by sun-drying prior to use, reduced bacterial infections in the analyzed samples, whose muscle tissues were colonized only by very minor bacterial infections (4.9%), compared to intestines (10.8%) and water (13.0%). Although higher in the first four intestinal segments, proteolytic activity was generally low in tilapia. The presence of protease inhibitors has been demonstrated in plant ingredients, of which soybean meal has been more inhibitive. Finally, the production cost/kg offish was reduced with formulated feed (1.5 USD/kg) compared to commercial feed (2.3 USD/USD), and this cost was further reduced for fish reared in fertilized ponds (0.4 USD/kg)|
|Document Type:||Thèse de doctorat|
|Open Access Date:||18 April 2019|
|Collection:||Thèses et mémoires|
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