Economic Analysis of Nile Tilapia (Oreochromis niloticus) Production in Tanzania
ABSTRACT Abstract In Tanzania, Nile tilapia culture is a promising aquaculture enterprise. Information on production costs could assist fish farmers in economic and financial planning. Economic profitability of small-scale Nile tilapia production in Tanzania is analyzed using a model that simulates individual fish growth and takes into account fish population dynamics in the pond. The results suggest that the current practiced mixed-sex tilapia culture without predation is not economically sustainable. Extension efforts should be geared toward developing a Nile tilapia production system that is based on a hand-sexed all-male tilapia. Meanwhile catfish can be introduced in ponds to control overcrowding in mixed-sex tilapia culture without predation. Studies to determine optimal pond sizes, availability of feed, and a quality fingerling supply chain are also fundamental for developing a sustainable Nile tilapia production system in Tanzania. Under improved Nile tilapia production systems, returns are high enough to justify investment through borrowed capital from formal institutions.
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ABSTRACT: Abstract: A study was conducted to compare the growth potential of monosex Nile tilapia at two different stocking densities. Fish of 2.6±0.1g average weight were stocked in ponds at the stocking density of 3fish/m2 (low stocking density ‘LD’) and 13fish/m2 (high stocking density ‘HD’) respectively. Locally feed (CP; 25 %) was administered at 5% of body weight three times a day for five months. Monthly sampling was conducted to assess growth by measuring weight and length of 30 fish from both systems to obtain the average weight and length for specific growth rate (SGR), feed conversion ratio (FCR), average daily gain (ADG), weight gain (WG) and Biomass (BM). There was significantly higher (p<0.05) fish growth performance in LD ponds; SGR (3.47%), ADG (0.57g), WG (83.5g) compared to HD; SGR (2.71%), ADG (0.27g) and WG (40.8g). BM in HD was significantly higher (565.3g) compared to LD (258.3). There was no significant difference (p>0.05) in FCR, although lower value was in HD (2.46) than LD (2.71). The differences in performance of Tilapia in the two stocking densities could have been attributed to stress, competition for food and living space. However, HD gave significantly higher biomass yield per area than LD and can be very useful to give good returns for local consumption and where resources like land, water and capital are inadequate. There is therefore need to determine the optimum management levels necessary to boost fish growth of under high-density systems. Key words: Feed Conversion Ratio Nile Tilapia Specific Growth Rate BiomassWorld Journal of Fish and Marine Sciences. 01/2014; 6(2).
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ABSTRACT: The purpose of this study was to test polyculture of Nile tilapia and the native Mayan cichlid, as an alternative production method of tilapia. The experiment had a 2 × 4 factorial design: the first factor was the population of tilapia (mixed-sex and 95% males) and the second factor was the proportion of Nile tilapia: Mayan cichlid (3:1, 5:1, 7:1 and 1:0). Proportion of 1:0 was tilapia monoculture. At stocking, tilapias were 11 weeks old and weighed 24.0 g and Mayan cichlids weighed 5.0 g. Recirculating water systems were used, with 24 fiberglass tanks 1 m3 with permanent water flow (7 L min− 1) and aeration. Each treatment had 3 replicates distributed randomly, and 24 fish were introduced in each tank (30 fish m− 3). The experiment lasted 21 weeks, until tilapia reached marketable size. Fish were fed with extruded formulated diets for tilapia (40% and 30% crude protein). Daily feeding rate was restricted to between 4% and 1.8% of the fish biomass. Temperature, DO and pH (28.0 ± 1.1 °C, 5.2 ± 1.2 mg L− 1 and 7.9 ± 0.2) were within the appropriate ranges for growth, and TAN, nitrites and total alkalinity (0.29 ± 0.22 mg L− 1, 0.04 ± 0.03 mg L− 1 and 238 ± 27 mg L− 1) were within safe ranges. Average survival was high (99%) and no differences were found between populations and among proportions. Nile tilapia Stirling strain showed early (45 g after 3 experimental weeks) sexual maturation and growth dimorphism. Significantly better total yield, FCR and final tilapia body weight were obtained in the 95% male population (9.26 kg m− 3, 1.39 and 383 g) than in the mixed-sex population (7.70 kg m− 3, 1.52 and 315 g). The presence of the Mayan cichlid did not affect tilapia performance. The final weight of Mayan cichlid was significantly higher in the mixed-sex tilapia population (45.9 g) than in the 95% male population (34.4 g). Mayan cichlid growth was inversely proportional to its density, with final weights of 45.5 g, 39.0 g and 34.3 g (7:1 > 5:1 > 3:1). The differences in Mayan cichlid growth are associated with intraspecific competition for available tilapia larvae. Mouth brooding tilapia females with eggs or larvae were observed in both tilapia populations and in all proportions. When fish were weighed some tilapia females released their larvae in the tanks, and both Mayan cichlid and tilapia males were observed preying on them.Aquaculture. 01/2014; s 418–419:26–31.