EFFECTS OF SUBSTITUTING FISH MEAL WITH GROUNDNUT CAKE AND INCORPORATING ADANSONIADIGITATA (BAOBAB) AND MORINGAOLIFERALEAVES IN THE FEED OF TILAPIA (OREOCHROMISNILOTICUS L.) DURING THE REARING PHASE IN SENEGAL

Abstract

The strong growth of aquaculture in Senegal has led to a significant use of fishmeal, which is becoming rarified and expensive. In order to make the feed accessible to small-scale producers, it became necessary to find a substitute for the fish meal mainly used in fish feeds, due to its high content of balanced proteins. Therefore, three feeds were formulated for rearing fish in comparison to an industrial feed. The study was conducted for 45 days and involved 4 g fry of the species Oreochromisniloticus. They were fed twice a day with iso-protein diets containing 40% PB/MS. Fishmeal was substituted by groundnut meal at doses of 0%, 25%, 50% respectively in the different feeds tested noted R1 R2 and R3. Other ingredients were added such as maize meal, Moringaoliferaleaf and Andansoniadigitata(baobab) leaf. The growth performance of the animals on these three diets was measured and compared to fish fed with the control feed (imported industrial feed noted R4). The average final weights obtained were respectively for the diets R1, R2, R3 and R4 (5.32±0.63g, 6.84±1.20g, 8.81±2.10g, 7.41±1.47g). Fish fed the R1 diet had the lowest growth. Fish fed R3 had the best performance with a specific growth rate of 1.96 ± 0.35 and a feed conversion ratio (FCR) of 1.28 ± 0.53, compared to a specific growth rate (SGR) of 1.75 ± 0.44 and a feed conversion ratio of 1.53 ± 0.34 for fish fed the control diet R4. The latter is comparable to R2 which has a final average weight almost equivalent to R4.