Nutrition and feeds of Nile tilapia broodstock and fry.
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Studies on some aspects of tilapia and feed formulation conducted at BRS are reviewed in this paper. The effect fo varying dietary crude protien on growth and spawning frequency of tilapia was determined under laboratory conditions. The weight of male fish increased as dietary crude protein increased; however, weight gain of male fish did not follow a definite due to the asynchronous nature of spawning of the tilipia. Results suggested that when diets contain high-quality protein, and feedig is at station level, the influence of increasing dietary protein on spawning frequency and growth of the females are not cxonsiderable. In another study, tilapia broodstock in cages and tanks had the best growth and highest fry production when fed a 40% CP diet. Ipil-ipil leaf mal as a sole or major source of dietary protein caused weight loss among tilapia breeders, drastic reduction in fry production, and eventually cessation of reproduction. The growth of breeders describers decreased significantly with the incorpotion of more than 40% ipil-ipil in the diet. For Nile tilapia fry, growth was enhanced by availability of high phytoplankton densities in the rearing medium through the culture period. Feeding the fry with unialgal culture of Navicula and Chroococcus resulted in highest gains and survival rates. Chlorella gave poor survival and growth. Rice bran or Moina as feed for the fry was nutritionally inadequate. Their nutritional value improved when both were combined as feed.
In: Fortes, R.D., Darvin, L.C., de Guzman, D.L. (eds.). Fish and Crustacean Feeds and Nutrition. Proceedings of the Seminar-Workshop on Fish and Crustacean Feeds and Nutrition, 25-26 February 1985, Iloilo City, Philippines. Los Baños, Laguna, Philippines: Philippine Council for Aquatic and Marine Research and Development. pp. 40-49
PublisherPhilippine Council for Aquatic and Marine Research and Development
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Effect of shrimp biomass and feeding on the anti-Vibrio harveyi activity of Tilapia sp. in a simulated shrimp–tilapia polyculture system The efficiency of Tilapia hornorum to control luminous bacteria in a simulated shrimp farm environment has been reported. However, the effects of different factors such as feed input and the shrimp biomass were not taken into consideration. This study investigated the effect of feeding and increased shrimp biomass on the efficiency of tilapia to inhibit the growth of luminous bacteria. Results showed that feeding enhances the antibacterial activity or improves the efficiency of tilapia to inhibit the growth of luminous bacteria. However, the efficiency of tilapia at a biomass of 500 g/m3 is reduced if the shrimp biomass is greater than 80 g/m3. This explains the discrepancies in the results obtained in the use of tilapia to control luminous bacterial disease in shrimp ponds. The effect of starvation on the bacterial load of tilapia, grouper and milkfish feces and the amount of feces in the intestine was also investigated. Results showed that total bacterial and presumptive Vibrio count of fish feces decreased after 1 week of starvation except for the presumptive Vibrio count of grouper. The amount of feces in the intestine also decreased as starvation progressed. Moreover, bacteria isolated from the three species have antibacterial activity against the luminous bacteria Vibrio harveyi.
Book chapterMRR Romana-Eguia, MA Laron & MR Catacutan - In MR Hasan & MB New (Eds.), On-farm feeding and feed management in aquaculture, 2013 - Food and Agriculture Organization
Series: FAO fisheries and aquaculture technical paper; No. 583The contribution of the Philippines to tilapia production in Asia has increased steadily in the past five years as it addresses hunger and poverty alleviation in the region. Commercial tilapia aquaculture in the Philippines has improved as farmers have become aware of the importance of adopting innovative husbandry technologies. These include the use of intensive culture, using novel feed ingredients, improving the quality of industrial aquafeeds, adopting cost- effective feeding strategies and efficient pond fertilization methods, and culturing improved genetic strains. A case study was conducted to: a) assess current tilapia feed management practices; b) determine recent nutrition-based innovations that include the use of alternative feed ingredients, the adoption of nutritionally complete commercial tilapia feeds, and improvements to feed management practices; and c) evaluate these factors in terms of improved production efficiencies. Thirty-two farmers from selected tilapia cage hatcheries, pond hatcheries, grow- out cages and ponds in Regions III and IV-A (known major tilapia producing regions in the Philippines) were interviewed. The issues addressed included their farm management practices, with particular focus on tilapia feed preferences; quality, procurement and storage methods; and feeding strategies. Their responses were collated and analysed in the context of information simultaneously gathered from the scientific literature, popular publications and relevant websites. The results from the case study highlight the importance of farmers being trained and remaining well-informed about recent improvements in feed technologies and the use of efficient cost-saving feeding strategies to optimize the production of seed and marketable tilapia. Recommendations on how to increase tilapia production through improved feed and feed management practices are described. Finally, recommendations for local regulatory agencies to implement aquafeed quality and nutrient standards are provided.
Influence of feeding rate and diet form on growth and survival of Nile tilapia (Oreochromis niloticus) fry Young Nile tilapia (12 mg mean body weight and 11 mm total length) were stocked at a density of 5 fish/l in twelve 50-l aquaria filled with 30 l of tap water. They were fed pellet crumbles containing 35% crude protein at various daily feeding rates expressed as percentages of fish biomass. Mean increases in body weight after 5 weeks were 63, 198, 232 and 228 mg for the 15, 30, 45 and 60% feeding rates, respectively, when ambient temperature ranged from 19 to 21°C. Corresponding survival rates were 53, 85, 87 and 84%. Growth and survival rates were enhanced significantly (P < 0.01) at the 30, 45 and 60% feeding rates. Two feeding trials were conducted to compare the growth and survival of fry fed pellet crumbles and an unpelleted form of the same diet. Results showed that growth and feed conversion were similar for both forms of diet. However, the survival rate of fry fed pellet crumbles was significantly higher (P < 0.01) than the survival rate of fry fed the unpelleted diet. Prior pelleting of the formulated diet for the tilapia fry given at 30% to 45% of fish biomass daily ensured high survival, fast growth and efficient feed conversion.