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Journal articles on the topic "Nile tilapia - Economic performance. eng"
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Elkafrawy, Ibrahim. "Impacts of Feeding Restriction Regimes on Economic and Productive Performance of Nile Tilapia Fish." Journal of Current Veterinary Research 2, no. 2 (October 1, 2020): 39–45. http://dx.doi.org/10.21608/jcvr.2020.121514.
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Passinato, Érica Bevitorio, Francisco Oliveira de Magalhães Junior, Filipe Dos Santos Cipriano, Ricardo Henriquede Bastos Souza, Kauana Santos de Lima, Jorge Chiapetti, and Luis Gustavo Tavares Braga. "Performance and economic analysis of the production of Nile tilapia submitted to different feeding management." Semina: Ciências Agrárias 36, no. 6Supl2 (December 16, 2015): 4481. http://dx.doi.org/10.5433/1679-0359.2015v36n6sup2p4481.
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The productive performance and the variable cost of production were evaluated for different feeding strategies for tilapia during the production cycle. A sample of 2,000 juvenile tilapia was distributed (23.55 ± 2.38 g) into five treatments and with four repetitions as follows: C (feed consumption to apparent satiety), R20 (beginning feed restriction when fish reached an average weight of 20 g), R200 (beginning feed restriction when fish reached an average weight of 200 g), R400 (beginning feed restriction when fish reached an average weight of 400 g) and R600 (beginning feed restriction when fish reached an average weight of 600 g). The fish were given extruded commercial feed containing 34% crude protein until they reached a weight of 200 g, at which time they received feed containing 32% crude protein. Monthly biometrics were performed in order to determine the food restriction starting point, which was one day of restriction followed by six feeding days. The following parameters were evaluated: water quality, productive performance variables, the variable costs of production and excreted nitrogen. The results were subjected to analysis of variance, and the means were compared using Tukey’s test (5% significance). No statistical differences were observed in final weight, weight gain, feed consumption, feed conversion or survival. The fish from the R20 treatment had the lowest variable cost of production (g fish-1) and the lowest nitrogen excretion into the water. This suggests that feed restriction from the early stages of life does not compromise the productive performance and contributes to reducing the variable costs and the quantity of nitrogen excreted into the environment. Thus, a one-day per week feed restriction strategy can be applied from the earliest stages of life without compromising the productive performance or body composition of Nile tilapia. This strategy can also reduce variable costs of production by means of reducing relative labour and feed costs.
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Passinato, Érica Bevitorio, Francisco Oliveira de Magalhães Junior, Filipe Dos Santos Cipriano, Ricardo Henriquede Bastos Souza, Kauana Santos de Lima, Jorge Chiapetti, and Luis Gustavo Tavares Braga. "Performance and economic analysis of the production of Nile tilapia submitted to different feeding management." Semina: Ciências Agrárias 36, no. 6Supl2 (December 16, 2015): 4481. http://dx.doi.org/10.5433/1679-0359.2015v36n6supl2p4481.
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<p>The productive performance and the variable cost of production were evaluated for different feeding strategies for tilapia during the production cycle. A sample of 2,000 juvenile tilapia was distributed (23.55 ± 2.38 g) into five treatments and with four repetitions as follows: C (feed consumption to apparent satiety), R20 (beginning feed restriction when fish reached an average weight of 20 g), R200 (beginning feed restriction when fish reached an average weight of 200 g), R400 (beginning feed restriction when fish reached an average weight of 400 g) and R600 (beginning feed restriction when fish reached an average weight of 600 g). The fish were given extruded commercial feed containing 34% crude protein until they reached a weight of 200 g, at which time they received feed containing 32% crude protein. Monthly biometrics were performed in order to determine the food restriction starting point, which was one day of restriction followed by six feeding days. The following parameters were evaluated: water quality, productive performance variables, the variable costs of production and excreted nitrogen. The results were subjected to analysis of variance, and the means were compared using Tukey’s test (5% significance). No statistical differences were observed in final weight, weight gain, feed consumption, feed conversion or survival. The fish from the R20 treatment had the lowest variable cost of production (g fish-1) and the lowest nitrogen excretion into the water. This suggests that feed restriction from the early stages of life does not compromise the productive performance and contributes to reducing the variable costs and the quantity of nitrogen excreted into the environment. Thus, a one-day per week feed restriction strategy can be applied from the earliest stages of life without compromising the productive performance or body composition of Nile tilapia. This strategy can also reduce variable costs of production by means of reducing relative labour and feed costs. </p>
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Sousa, R. M. R., C. A. Agostinho, F. A. Oliveira, D. Argentim, P. K. Novelli, and S. M. M. Agostinho. "Productive performance of Nile tilapia (Oreochromis niloticus) fed at different frequencies and periods with automatic dispenser." Arquivo Brasileiro de Medicina Veterinária e Zootecnia 64, no. 1 (February 2012): 192–97. http://dx.doi.org/10.1590/s0102-09352012000100027.
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The performance of Nile tilapia (Oreochromis niloticus) raised in cages furnished with an automatic dispenser, supplied at different frequencies (once per hour and once every two hours) and periods (daytime, nighttime and both) was evaluated. Eighteen 1.0m³ cages were placed into a 2000m² pond, two meters deep with a 5% water exchange. One hundred and seventy tilapias, with initial weight of 16.0±4.9g, were dispersed into each 1m³ cage and the feed ration was adjusted every 21 days with biometry. Data was collected from March to July (autumn and winter). Significant difference to final weight (P<0.05) among treatments was observed. The increase in feeding frequency improves the productive performance of Nile tilapias in cages and permitted better management of the food. The better feed conversion rate for high feeding frequency (24 times day-1) can result in saving up to 360kg of food for each ton of fish produced, increasing the economic sustenance for tilapia culture and suggesting less environmental pollution.
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Sadek,, Mohammed. "The Effect of some Dietary Medicinal Herbal Extracts on Growth Performance and Economic Efficiency of Nile Tilapia." Journal of Animal, Poultry & Fish Production 9, no. 1 (July 15, 2020): 47–54. http://dx.doi.org/10.21608/japfp.2020.130634.
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Afram, Foster, Nelson Winston Agbo, Daniel Adjei-Boateng, and Hillary Egna. "Effects of Feeding Strategies on Growth Performance and Economic Returns on the Production of Nile Tilapia (Oreochromis niloticus) in Fertilized Ponds." Aquaculture Studies 21, no. 2 (February 8, 2021): 63–73. http://dx.doi.org/10.4194/2618-6381-v21_2_03.
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This study evaluated the effects of restrictive feeding strategies on the profitability of tilapia production in fertilized ponds. Sex-reversed tilapia fingerlings (~60g) were cultured for five months under three feeding strategies; alternate-day full ration (100%), 66.7% and 75% of full ration daily. Fish fed 75% of the full ration daily had the highest final weight (411.3±39.32 g), followed by fish fed 66.7% of the full ration daily (352.0±9.17 g) and the fish fed alternate-day full ration (227.8±22.17 g). Fish that received the alternate-day full ration had the lowest feed intake (223.8±29.77 g fish-1) and a better feed conversion ratio (1.30±0.12) compared to the fish fed 66.7% (1.51±0.12) and 75% (1.52±0.09) of full ration daily. Crude protein, dry matter, ash content and the hepatosomatic index of the fish were not affected by the feed restriction. The crude lipid, mesenteric fat and the viscerosomatic indices were significantly (P<0.05) lower in fish that received the alternate-day full ration. While the cost of production was lowest in the alternate-day ration, it had the lowest economic returns (US$ 82.95±8.60) compared to fish that received 66.7% and 75% of full ration daily (131.16±22.62 and 162.48±19.64 US$, respectively). These results indicated that tilapia can be cultured in fertilized ponds and fed with two-thirds of daily full ration given in intensive systems without any effect on economic returns.
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Kirimi, James G., Levi M. Musalia, Adiel Magana, and Jonathan M. Munguti. "Performance of Nile Tilapia (Oreochromis niloticus) Fed Diets Containing Blood Meal as a Replacement of Fish Meal." Journal of Agricultural Science 8, no. 8 (July 17, 2016): 79. http://dx.doi.org/10.5539/jas.v8n8p79.
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<p>A 100 days experiment was conducted to determine the effect of feeding blood meal (BM) as a replacement of fish meal (FM), as the main source of animal protein, on growth rate and economic performance of Nile tilapia in fertilized pond. Three isonitrogenous diets (35% crude protein) were formulated using either FM as the main source of animal protein (Diet 1); 50% replacement of FM with blood meal (Diet 2); or 100% replacement of FM with BM (Diet 3). Three hundred Nile tilapia fingerlings (12±3 g) were randomly distributed into three groups of four replicates of 25 fingerlings per cage. The groups were randomly assigned the 3 diets which were fed at 2% of their biomass at 10 am and 4 pm every day. Percentage daily weight gain (DWG), relative growth rate (RGR), specific growth rate (SGR), survival rate and feed utilisation efficiency were measured. Fish fed diet 1 were larger (50.69 g) (P < 0.05) than those fed diet 2 (48.47 g) and 3 (40.37 g). Replacement of FM with 50% and 100% BM reduced the incidence cost (45.55, 37.83 and 31.88, respectively). The profit index was highest with 100% (9.42) replacement of FM, compared to 50% (7.95) and 0% (6.69). Although replacing FM with BM was associated with reduced growth, the economic return was better (P < 0.05). Based on the present results, it was economical to use BM as a major protein source instead of FM in formulating fish feed.</p>
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Fava, Aldo Felipe, Gildete de Souza Bezerra, Dacley Hertes Neu, Fabio Bittencourt, Altevir Signor, Aldi Feiden, Pitagoras Augusto Piana, and Wilson Rogério Boscolo. "Effect of feed processing during the nursery rearing of the Nile tilapia (Oreochromis niloticus)." Revista Agraria Academica 4, no. 4 (July 1, 2021): 55–66. http://dx.doi.org/10.32406/v4n4/2021/55-66/agrariacad.
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This study aimed to compare 5 feed processing for O. niloticus fingerlings: ME1: micro-extruded 1 mm; ED03: extruded and disintegrated 0.3 mm; ED06: extruded and disintegrated 0.6 mm; BF03: bran 0.3 mm and BF06: bran 0.6 mm. Feed conversion was lower in ME1 and ED06. The protein retention coefficient was statistically higher in ME1. The fish proximate composition did not differ among treatments. Although superior in ME1 weight gain did not differ statistically from ED06. ME1 resulted in nitrogen and phosphorus in water statistically lower. ME1, ED06 and BF06 obtained the highest partial net revenues. Thus, ME1 presented the best zootechnical indices, economic performance and reduced impact on water quality.
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Mahanama, Dulmini, Kumudu Radampola, and Erangi Heenkenda. "Effect of Cassava Starch Sources on Growth and Feed Utilization of Nile Tilapia Fingerlings (Oreochromis niloticus) Reared Under Two Dietary Protein Levels." Aquaculture Studies 21, no. 4 (August 8, 2021): 169–79. http://dx.doi.org/10.4194/2618-6381-v21_4_04.
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A 42-day experiment was performed to evaluate the growth performance and feed utilization of Nile tilapia (Oreochromis niloticus) fingerlings fed iso-lipidic diets (5% lipid) contain 17% or 25% of cassava starch extract from fresh root (R starch) or from dry chips (D-starch) at 37% and 30% protein levels. The diets were ie: 37% protein -FM25R17 & FM25D17, 30% Protein- FM15R25 & FM15D25. 144 fish (1.11+0.02g) were distributed in 12 tanks (54 L). Protein level or starch source had no impact on final weight, length, average daily gain, specific growth rate, food conversion ratio, hepato somatic index, viscero somatic index, and Whole-body composition of fish. Protein Efficiency Ratio was not affected by starch source; however, it was significantly higher in diets with low protein content. Apparent Digestibility Coefficient of dry matter was not affected by starch source but was significantly high in low (30%) protein diet. Inclusion of R starch substantially reduced the cost of feed and increased economic profitability. Tilapia fed FM15R25 diet showed similar growth and nutrient utilization to fish fed 37% protein diets and cost of FM15R25 diet was lower than other diets. Therefore, FM15R25 is the best practical diet among the tested diets for Nile tilapia fingerlings.
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Abou-Zied, R. "EFFECT OF DIET EXTRUDED TYPE ON GROWTH PERFORMANCE, FEED UTILIZATION AND ECONOMIC EFFICIENCY OF NILE TILAPIA IN COMMERCIAL FARMS." Egyptian Journal of Nutrition and Feeds 18, no. 1 (April 1, 2015): 143–50. http://dx.doi.org/10.21608/ejnf.2015.104795.
Full textDissertations / Theses on the topic "Nile tilapia - Economic performance. eng"
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Squassoni, Gustavo Henrique. "Avaliação econômica e produtiva de tilápia do Nilo, revertida e não revertida, na fase de recria/." Jaboticabal : [s.n.], 2010. http://hdl.handle.net/11449/95253.
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Orientador: Maria Célia PortellaCoorientador: Dalton José Carneiro
Banca: Cláudio Angelo Agostinho
Banca: Maria Inêz Espagnolli Geraldo Martins
Resumo: A piscicultura nacional passa por um momento delicado onde a maior preocupação é o mercado. O desenvolvimento deste setor produtivo depende de adaptações nos diferentes sistemas de produção adotados atualmente, sendo necessário adequar-se às restrições impostas pelo mercado, bem como analisar a viabilidade econômica de produções alternativas. O presente estudo teve como objetivo avaliar o desempenho produtivo e econômico da tilápia do Nilo durante a fase de recria, submetida ou não ao processo de reversão sexual, em três diferentes sistemas de cultivo: semi-intensivo com utilização de fertilização orgânica de viveiros, semi-intensivo com utilização de dieta formulada e sistema intensivo em hapas com oferecimento de dieta formulada. Utilizou-se um delineamento inteiramente casualizado, com seis tratamentos em esquema fatorial 3 x 2, referente aos três sistemas de produção e aos dois grupos de animais. Para a realização do experimento, foram utilizados 12.920 juvenis de tilápia do Nilo, com peso médio inicial de 0,3 g, distribuídos em 12 viveiros escavados e 6 hapas, na densidade de 20 e 600 peixes/m3, respectivamente. Não foram observadas diferenças no desempenho de peixes revertidos ou não revertidos. Os peixes dos tratamentos submetidos ao sistema semi-intensivo com dieta formulada apresentaram melhores (p<0,05) ganho em peso, conversão alimentar aparente e taxa de crescimento específico (42,3g; 1,17; 3,71%, respectivamente). Os itens de maior importância na participação dos custos totais foram os relacionados à aquisição de juvenis e alimentação, respectivamente. De maneira geral, o período desfavorável (inverno) e o custo elevado da ração utilizada (R$2,33/kg) proporcionaram prejuízos. Na simulação da produção, verificaram-se maiores lucros operacionais para os tratamentos semi-intensivos em viveiros com dieta formulada, com utilização... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The national aquaculture is currently in a period in which part of the market is changing. To be successful, the aquaculture should be able to adapt its production systems aiming at to adjust and meet the market restrictions. The new trends point to different possibilities of aquaculture production that potentially increase the incomes. The objective of this study was to evaluate the growth, economic performance and microbiological characteristics of Nile tilapia reared in different production systems during the initial growth phase. Specifically, mono and mixed-sex Nile tilapia juvenile were raised in three farming systems: semi-intensive using only organic fertilization (swine manure), semi-intensive using formulated diet, and intensive system in hapas using diet formulated. The experiment was developed in two factorial design (3 x 2); considering as factors, three production systems and two groups of fish submitted or not to the process of sex reversal. In the experiment, 12,920 Nile tilapia juvenile (initial weight 0.3g) were distributed into 12 ponds and 6 hapas at the densities of 20 and 600 fish/m3, respectively. There were no differences of growth performance of the mono or mixed-sex fish. The fish subjected to semiintensive system with formulated diet have shown better (p <0.05) weight gain, feed conversion ratio and specific growth rate (42.3 g, 1.17 and 3.71%, respectively). The items of highest importance in the composition of the total costs were related to the acquisition of juveniles and feed, respectively. In general, the unfavorable period (winter) and the high cost of the feed used (R$ 2.33 / kg) resulted in losses. In the analysis of the production simulation, the treatments with mono-sex tilapia in semi-intensive ponds fed with formulated diet resulted in higher operating profits, due to the higher survival rates and growth observed in this group... (Complete abstract click electronic access below)
Mestre
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Buzollo, Hellen. "Processamentos e níveis proteicos das dietas nos desempenhos técnico e econômico da produção de tilápia-do-nilo em gaiolas /." Jaboticabal : [s.n.], 2011. http://hdl.handle.net/11449/95248.
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Orientador: Dalton José CarneiroBanca: Maria Inez Espagnoli Geraldo Martins
Banca: Giovani Sampaio Gonçalves
Resumo: O objetivo do estudo foi avaliar o desempenho produtivo e determinar os custos de produção buscando melhores lucratividades de tilápias-do-nilo criadas em gaiolas com dietas peletizadas e extrusadas contendo três níveis de proteína digestível. Foram utilizados 990 peixes revertidos para machos (116,02 ± 25,87g), distribuídos em 18 gaiolas (1,0 m3), em delineamento inteiramente casualizado com seis tratamentos e três repetições, em esquema fatorial 2 x 3, com 55 tilápias-do-nilo em cada gaiola. Os peixes foram alimentados com seis dietas com aproximadamente 4223 kcal kg-1 de energia digestível, contendo três níveis de proteína digestível (25,0; 28,0 ou 31,0 %). As tilápias foram arraçoadas seis vezes ao dia, durante 117 dias. Não houve mortalidade durante o período experimental. As tilápias alimentadas com dietas extrusadas, obtiveram melhor desempenho produtivo, apresentando as melhores médias para todas as variáveis analisadas. Quanto ao nível proteico, as maiores médias de consumo diário de dieta (CDD) (P<0,05) ocorreram com tilápias alimentadas com dietas de 31,0 % PD, diferente das taxas de eficiência proteica (TEP) e eficiência de retenção de proteína bruta (ERPB) que diminuíram com a elevação do nível proteico. Dietas extrusadas apresentaram as melhores médias de coeficiente de digestibilidade aparente (CDA) para proteína bruta (PB). O item de maior importância na participação dos custos totais foi relacionado à alimentação. De maneira geral, devido a baixa densidade de estocagem e altos custos operacionais, foram obtidos prejuízos em todos os tratamentos. Na simulação da produção, os indicadores econômicos mostraram que a densidade de estocagem e o custo da dieta foram fatores decisivos para se obter lucratividade. A adoção de estratégia alimentar pode aumentar os lucros operacionais da produção
Abstract: The objective of the study was to evaluate production performance and to determine production costs in order to optimize the profit from a net cage tilapia production fed pelletized and extruded diets containing three different levels of digestible proteins. The experiment used 990 reverted to males (116.02 ± 25,87g), distributed in 18 cages (1.0 m3) at a density of 55 tilapias per cage. Experimental design was completely randomized in a 2 x 3 factorial, with six treatments with three replicates. The fish were fed six diets containing approximately 4223 kcal kg-1 of digestible energy and three different levels of digestible protein (25.0, 28.0 or 31.0 %). Tilapias were fed six times daily, during 117 days. The different treatments did not affect survival rates. Tilapia fed extruded diets displayed better productive performance and better means for the studied variables. As for protein level, the higher averages of diet daily consumption (DDC) (P<0.05) were observed for tilapias that were fed the 31.0 % DP diet. On the other hand, protein efficiency ratio (PER) and protein productive value (PPV) decreased as protein level increased. Extruded diet displayed the best means of apparent digestibility coefficient (ADC) for crude protein (CP). While estimating total production cost, feeding cost was the most important. In general, due to low stocking density and high operational costs, no treatment was cost effective. Economic indicators obtained from the simulation of production study showed that stocking density and diet costs were decisive factors when determining how profitable the activity can be. The adoption of a feeding strategy increased operational profits of production
Mestre
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Squassoni, Gustavo Henrique [UNESP]. "Avaliação econômica e produtiva de tilápia do Nilo, revertida e não revertida, na fase de recria." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/95253.
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squassoni_gh_me_jabo.pdf: 417643 bytes, checksum: 2b7f2ef0b5e020632b1db1603aa276ca (MD5)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
A piscicultura nacional passa por um momento delicado onde a maior preocupação é o mercado. O desenvolvimento deste setor produtivo depende de adaptações nos diferentes sistemas de produção adotados atualmente, sendo necessário adequar-se às restrições impostas pelo mercado, bem como analisar a viabilidade econômica de produções alternativas. O presente estudo teve como objetivo avaliar o desempenho produtivo e econômico da tilápia do Nilo durante a fase de recria, submetida ou não ao processo de reversão sexual, em três diferentes sistemas de cultivo: semi-intensivo com utilização de fertilização orgânica de viveiros, semi-intensivo com utilização de dieta formulada e sistema intensivo em hapas com oferecimento de dieta formulada. Utilizou-se um delineamento inteiramente casualizado, com seis tratamentos em esquema fatorial 3 x 2, referente aos três sistemas de produção e aos dois grupos de animais. Para a realização do experimento, foram utilizados 12.920 juvenis de tilápia do Nilo, com peso médio inicial de 0,3 g, distribuídos em 12 viveiros escavados e 6 hapas, na densidade de 20 e 600 peixes/m3, respectivamente. Não foram observadas diferenças no desempenho de peixes revertidos ou não revertidos. Os peixes dos tratamentos submetidos ao sistema semi-intensivo com dieta formulada apresentaram melhores (p<0,05) ganho em peso, conversão alimentar aparente e taxa de crescimento específico (42,3g; 1,17; 3,71%, respectivamente). Os itens de maior importância na participação dos custos totais foram os relacionados à aquisição de juvenis e alimentação, respectivamente. De maneira geral, o período desfavorável (inverno) e o custo elevado da ração utilizada (R$2,33/kg) proporcionaram prejuízos. Na simulação da produção, verificaram-se maiores lucros operacionais para os tratamentos semi-intensivos em viveiros com dieta formulada, com utilização...
The national aquaculture is currently in a period in which part of the market is changing. To be successful, the aquaculture should be able to adapt its production systems aiming at to adjust and meet the market restrictions. The new trends point to different possibilities of aquaculture production that potentially increase the incomes. The objective of this study was to evaluate the growth, economic performance and microbiological characteristics of Nile tilapia reared in different production systems during the initial growth phase. Specifically, mono and mixed-sex Nile tilapia juvenile were raised in three farming systems: semi-intensive using only organic fertilization (swine manure), semi-intensive using formulated diet, and intensive system in hapas using diet formulated. The experiment was developed in two factorial design (3 x 2); considering as factors, three production systems and two groups of fish submitted or not to the process of sex reversal. In the experiment, 12,920 Nile tilapia juvenile (initial weight 0.3g) were distributed into 12 ponds and 6 hapas at the densities of 20 and 600 fish/m3, respectively. There were no differences of growth performance of the mono or mixed-sex fish. The fish subjected to semiintensive system with formulated diet have shown better (p <0.05) weight gain, feed conversion ratio and specific growth rate (42.3 g, 1.17 and 3.71%, respectively). The items of highest importance in the composition of the total costs were related to the acquisition of juveniles and feed, respectively. In general, the unfavorable period (winter) and the high cost of the feed used (R$ 2.33 / kg) resulted in losses. In the analysis of the production simulation, the treatments with mono-sex tilapia in semi-intensive ponds fed with formulated diet resulted in higher operating profits, due to the higher survival rates and growth observed in this group... (Complete abstract click electronic access below)
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Novaes, Alex Frederico de. "Volumes de tanques-rede na produção da tilápia-do-nilo : estudo de caso /." Jaboticabal : [s.n.], 2010. http://hdl.handle.net/11449/86682.
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Orientador: Maria Inez Espagnoli Geraldo MartinsBanca: João Donato Scorvo Filho
Banca: Teresa Cristina Ribeiro Dias Koberstein
Resumo: Nos últimos anos, a demanda pelo pescado tem aumentado significativamente. Atualmente, a pesca, que contribui com a maior parte deste produto, vem apresentando estagnação, ou ligeira queda na oferta em alguns anos como foi o caso de 2006. Em contrapartida, a aquicultura moderna, que passa por grandes avanços científicos e tecnológicos, vem suprindo esta deficiência no mercado. O Brasil, detentor de 12% de toda água doce mundial, deverá se tornar brevemente um grande produtor no cenário mundial. Um dos grandes diferenciais do país, além de possuir clima favorável, é a disponibilidade de grandes reservatórios, que tem sido aproveitado para o cultivo de peixes em tanques-rede. O presente estudo, desenvolvido em piscicultura comercial, no Reservatório de Furnas, curso médio do rio Grande, município de São José da Barra MG teve como objetivo comparar os principais indicadores zootécnicos e econômicos da tilapicultura em sistema super-intensivo (tanques-rede) em duas diferentes dimensões 6 e 18 m3. Foram utilizados 12.960 juvenis machos revertidos da tilápia-do-nilo (Oreochromis niloticus). Durante todo o período experimental, os peixes receberam ração extrusada especial para tilápias em cultivos super-intensivo e a oferta variou de acordo com a biomassa e temperatura da água, iniciando com 8% e decrescendo até 1%. Foram avaliados os seguintes índices zootécnicos: sobrevivência (%), peso médio (g), biomassa (kg), ganho de biomassa (kg), ganho em peso diário (g), conversão alimentar aparente e densidade (kg/m3). A análise econômica foi elaborada a partir da determinação do custo total de produção e do lucro de cada tratamento. Os dados deste estudo permitem concluir que, embora não diferindo nos principais indicadores zootécnicos, a produção de tilápias em tanques-rede de maior dimensão proporcionou menor custo total médio e maior rentabilidade
Abstract: In the past few years, demand for fish has increased significantly. At present, fishing, which contributes with the largest part of this product, has shown stagnation or slight falling in the offer in some years, as in the case of 2006. On the other hand, modern aquiculture, with technological and scientific improvement, has been supplying this deficit on the market. Brazil, with 12% of the world's fresh water, will probably become one of the greatest consumers soon. Besides the favorable weather, there is also the availability of large reservoirs, which has been used for the growing of fish in net cage. The present study, developed at Furnas reservoir, medium course of Grande river, in São José da Barra/MG, had as its aim compare the economic and zootechnic indicators of tilapiculture in super intensive system net cages in two different dimensions 6 and 18 m3. 12,960 reversed male juvenils from Nile tilapia were used (Oreochromis niloticus). During the experiment the fish received (extrusada) special ration for tilapia in super intensive culture and the offer varied according to the biomass and water temperature, beginning with 8% and decreasing until 1%. The following zootechnic indexes were evaluated: survival (%), average weight (g), biomass (kg), gain of biomass (kg), gain of daily weight (g), apparent nutritional conversion and density (kg/m3). The economic analysis was made after the determination of the total cost of the production and the profit of each treatment. The data in this study allows the conclusion that the production of tilapia in (net cages) of bigger dimension offered bigger rentability
Mestre
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Gayão, Ana Laura Borba de Andrade. "Nutrição e reversão sexual de tilápia do Nilo : parâmetros produtivos e estrutura do fígado /." Jaboticabal : [s.n.], 2009. http://hdl.handle.net/11449/100246.
Full textAbstract:
Orientador: Dalton José CarneiroBanca: Margarida Maria Bastos
Banca: Claudinei da Cruz
Banca: Rosângela Kiyoko Jomori
Banca: Rodrigo Roubach
Resumo: O estudo teve como objetivo comparar o desempenho produtivo de tilápias do Nilo revertidas ou não por meio da utilização do hormônio 17-α-metiltestosterona (MT) adicionado a dietas práticas e analisar histologicamente o fígado dos peixes. Foram conduzidos quatro experimentos com tilápias do Nilo, da linhagem tailandesa, revertidas ou não revertidas, desde a larvicultura até a engorda em tanques-rede. As dietas utilizadas nos experimentos foram formuladas de forma a assemelharem-se às dietas comerciais utilizadas nas pisciculturas, sendo isocalóricas, variando os níveis e fontes de proteína bruta. Procurou-se simular as causas de fígado gorduroso e friável e mortalidade próxima ao abate de tilápias do Nilo cultivadas em regime intensivo. No primeiro experimento, conduzido com larvas desde a eclosão até 60 dias de idade, observou-se que o nível de 30 mgMT.kg-1 adicionado à dieta, possibilitou eficiência na reversão, melhor desempenho produtivo e menores danos ao fígado que na dosagem de 60 mgMT.kg-1. Nesse mesmo experimento, os peixes que não receberam hormônio tiveram maior taxa de sobrevivência e não mostraram alterações histológicas no fígado. No segundo experimento, a reversão sexual favoreceu o desempenho dos juvenis na fase de recria. Porém, não foi possível observar diferenças no desempenho entre os níveis de proteína da dieta. Um terceiro experimento com tilápias cultivadas em tanques-rede dos 120 aos 600 g de peso, os peixes mostraram melhor desempenho quando alimentados com dieta contendo 32% PB, sendo que o fato de terem passado pelo processo de reversão ou não, não influenciou o desempenho. Um quarto experimento foi realizado concomitantemente ao terceiro em laboratório com juvenis de 30 g até atingirem 200 g e as tilápias revertidas apresentaram... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The aim of the study was compared reversed or no reversed Nile tilapia growth performance and liver histology. Fishes were sex reversed with addition of 17-α- methyltestosterone (MT) at the diets. The study was divided in four experiments: larval phase, growth phase and the final phases in cages and at laboratory. The diets were isocalorics, formulated as commercials diets common used in the Brazil tilapia cultures, utilizing levels and sources protein. The objective was simulated the fat liver problem detected at tilapia farms. In the first experiment, there were used fries until 60 days of culture. There was observed that the level of 30 mgMT.kg-1 conducted to efficiency in the sex reversal with best growth performance and less liver damages than the level of 60 mgMT.kg-1. The fishes that didn't receive MT reached best survival and didn't show any liver alteration. In the second experiment, the facts of the fishes were sex reversed increased the growth performance of juveniles. But there was not difference in the growth performance by protein levels. The third experiment conducted at cages, with fishes of 120g until 600g, showed best growth performance when fed with 32% crude protein, but there was no difference by the fact of they were reversed or no. The fourth experiment was conducted at the same time of the third, at laboratory with tilapias of 30g until 200g. The reversed fishes showed best growth performance than the no reversed ones. Alterations of liver histology of the fishes reversed at the four experiments were noted. But there were more severe in the fishes fed with higher levels of crude protein.
Doutor
Book chapters on the topic "Nile tilapia - Economic performance. eng"
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Adeleke, M. L., D. Al-Kenawy, A. M. Nasr-Allah, M. Dickson, and Desalegn Ayal. "Impacts of Environmental Change on Fish Production in Egypt and Nigeria: Technical Characteristics and Practice." In African Handbook of Climate Change Adaptation, 789–805. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-45106-6_153.
Full textAbstract:
AbstractA survey approach was applied to examine the technical characteristics of fish farming practice in Egypt and Nigeria. Critical issues such as floods and other vices were considered in bringing out the inference and level of aquaculture in both countries. Multistage sampling technique was used to select the study area and the number of respondents. Both primary and secondary data were used in the analysis. Eighty fish farmers were randomly selected from each of the country, making a total of 160 respondents. The socioeconomic characteristics revealed that aquaculture is an antique venture in Africa with Egypt taking the lead, i.e., 99% of the respondents practice in large-scales production of more than 11 Fadden/acre per, and 100% males depend mainly on agricultural drainage water for their earthen ponds. Ninety-eight percent cultured tilapia (Oreochromis niloticus) which was believed to have originated from the Nile River. In terms of financial performance and partial economic analysis, tilapia production commands more sales in Egypt, while catfish (Clarias) production is seen as a promising venture in Nigeria. The fish farmers have various perceptions and reactions toward environmental changes factors such as cost of labor/manpower and inputs, poor water quality, and fish extension services, and climate change impedes aquaculture development in the countries. To achieve the scale of aquaculture expansion as observed in Asian and other developed part of the world, efforts should be geared toward continental and regional integration in order to encourage aquaculture practices in Nigeria and other parts of Africa. More so, government intervention and incentives should be paramount in Egypt to reduce the excessive exploitation of the private input suppliers.