972 resultados para Nile Tilapia
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Pós-graduação em Aquicultura - FCAV
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Níveis elevados de agressividade estão diretamente relacionados ao crescimento heterogêneo e ao canibalismo, podendo levar a perdas significativas na produção no setor da aquicultura. Uma alternativa para redução da agressividade poderia ser o aumento da produção de serotonina por meio da suplementação dietética com o aminoácido triptofano (TRP). A serotonina é um neurotransmissor que regula diversos processos comportamentais, dentre eles, a agressividade e o estresse. Assim, neste estudo avaliamos o efeito da suplementação dietética com triptofano TRP no comportamento agressivo em juvenis de tilápia-do-Nilo. Os peixes foram mantidos em aquários individuais durante sete dias e alimentados uma vez ao dia “ad libitum” com as dietas: T1(controle: 0,32% de TRP), T2 (1,28% de TRP) e T3 (2,56% de TRP). O índice de agressividade foi avaliado com base na resposta do peixe à sua imagem no espelho. Contabilizamos o número de ataques (mordidas) à imagem de um espelho posicionado em uma das laterais do aquário durante vinte minutos. Os peixes alimentados com T3 apresentaram menor frequência de mordidas (P = 0,010849) durante o período de observação, em comparação ao grupo controle. Concluímos que a dieta contendo 25,6mg/g TRP altera a agressividade em juvenis de tilápia-do-Nilo e que a rações suplementadas com TRP podem ser uma estratégia eficiente no manejo de pisciculturas. Também avaliamos os efeitos do TRP exógeno na ansiedade (teste do objeto novo) e estresse (teste do confinamento) em juvenis da tilápia-do-Nilo, porém não houve diferenças significativas entre os tratamentos
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Pós-graduação em Microbiologia Agropecuária - FCAV
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Pós-graduação em Zootecnia - FCAV
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Pós-graduação em Ciência e Tecnologia Animal - FEIS
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Pós-graduação em Zootecnia - FMVZ
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Employing the method of least squares and quadratic B-spline polynomials, different statistical models were tested to identify the most appropriate to model the mean trajectories of live weight and carcass yield of Nile tilapia (Oreochromis niloticus). Data of live weight (8,758) and carcass yield (2,042) of tilapias with ages between 106 and 245 days were obtained from 72 families derived from 36 males and 72 females. The sex and tank variables were considered as classificatory and the coefficients of quadratic polynomials B-spline of two to five intervals of the same size were used as covariables. According to most fit criteria used, the models with quadratic B-spline polynomial with five intervals of the same size presented the best adjustments. The increase in number of intervals of B-spline polynomial improved the fit of the polynomials to the data. The inclusion of classificatory effects from sex, tank, the interaction of these effects and the quadratic polynomial B-spline nested in this interaction indicated that, over time, each sex, grown in different tank, presented different mean trajectory, necessitating the inclusion of nesting time in the interaction sex x tank in order to avoid the under or overestimation of breeding values of the selection candidates in breeding programs of this species.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Pós-graduação em Biologia Animal - IBILCE
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Pós-graduação em Medicina Veterinária - FCAV
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The goal of this paper was to determine the effects of seven diets with differents fatty acids sources in hematology of Nile tilapia before and after cold stimulus. Seven diets, with 3% of fatty acid source, were formulated: soybean oil (OS); fish oil (OP); beef tallow (SB) and mixtures of OS+OP; OS+SB; OP+SB e OS+OP+SB. Fish (112 male of Nile tilapia of 30,0 +/- 2,65g) were totally randomly distributed, with four replicates, into 28 plastic aquaria (40 L; 4 fish per aquarium). Fish were fed four times per day for 35 days. At 35th day and also after seven days cold stimulus blood was collected and the profile hematological was evaluated. Leucocytes numbers were reduced in fish fed a SB and fish oil combination diet and were highest in fish fed SB diet before cold stimulus. Plasma protein was reduced in fish fed soybean oil diets and highest in fishes fed a combination of soybean oil, fish oil and SB diets. Anything fatty acids source promotes effective changes in fish health and cold tolerance promotion. Cold don't drastically reduced fish general health status.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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This study aimed to evaluate possible histopathological liver of tilapia fed diets containing fish silage and level protein. Sample of 180 fed with tilapia fingerlings fed with diets containing three protein levels (20, 24 and 28% CP), and Proportions residue fermented silage of tilapia (1/4 and 1/2) of were analyzed during 75 days. The tissue fragments were fixed in Bouin and included in Histosec (R). After that, between 2 to 5 mu m slices were done in a rotation microtome. The methods used for tissue analysis were hematoxilin/eosin and PAS. The histological slices were examined under light microscope (Olympus BX-50). The disarray in the morphology of the liver of fish fed biological silage was influenced by high protein levels, and increased proportions of 1/2 of animal protein diets. It was observed that the variation of hepatocytes is directly related to the type of diet for fish. In fish fed diets containing 28% CP, the liver showed disruption of the structure cordon of hepatocytes, necrosis and shifting points of the core to the periphery. Elevated levels of biological fish silage cause deleterious changes in the liver. The level of protein required to maintain the health of the associated development fish is 24% crude protein.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)