Masculinização de larvas de tilápia do Nilo (Oreochromis niloticus L.) a partir de banhos de imersão com 17alfa-metiltestosterona

Bombardelli, Robie Allan; Hayashi, Carmino

doi:10.1590/s1516-35982005000200002

Cited by 13 publications

(12 citation statements)

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“…In spite of the inconsistency of the nutrition of breeders on progeny performance, the values observed for average final weight (0.31 to 0.38 g), average weight gain (0.30 to 0.36 g), standard length (2.04 to 2.24 cm), condition factor (3.12 to 3.86), specific growth rate (4.91 to 5.19%/day), stock uniformity (81.7 to 98.5), survival (97 to 100%) and sex reversal rate (100%) in Nile tilapia post-larvae can be regarded as zootechnically adequate for the end of the sex reversal stage (Toyama et al, 2000;Meurer et al, 2003b;Bombardelli & Hayashi, 2005;Boscolo et al, 2005;Meurer et al, 2007;Oliveira, 2010) (Table 2).…”

Section: Resultsmentioning

confidence: 99%

“…Then, the tilapias were weighed and the standard and total lengths were measured individually with a digital scale (MARTE ® AS2000) with ±0.01 g precision and an ichthyometer with ±0.1 cm precision, respectively. Next, all fries were fixed in 10% formaldehyde (Bombardelli et al, 2007) and the effectiveness of sex reversal was analyzed by staining the gonads with acetocarmine and observation using an optical microscope, according to Pompa & Green (1990).…”

Section: Methodsmentioning

confidence: 99%

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Growth of Nile tilapia post-larvae from broodstock fed diet with different levels of digestible protein and digestible energy

Sousa¹,

Freccia²,

Santos

et al. 2013

R. Bras. Zootec.

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-This study was carried out to evaluate the influence of different levels of digestible energy and digestible protein in diets of Nile tilapia (Oreochromis niloticus) broodstock on offspring growth during sex reversal stage. A total of 2,700 post-larvae (8.2±0.001 mg) derived from breeders fed nine diets with distinct levels of digestible protein (28, 34 and 40% DP) and digestible energy (2,800; 3,400; and 4,000 kcal DE.kg -1 ) were stored in twenty-seven 70 L tanks. After 30 days of growth, their average final weight (AFW, g), average weight gain (AWG, g), final standard length (SL, cm), condition factor (CF), specific growth rate (SGR, %/day), stock uniformity (UNI, %), survival (SUR, %) and sex reversal rate (SRR, %) were measured. Although female nutrition is thought to influence the performance or quality of progeny during early life stages, no influence of diets supplied to broodstock was detected on any parameter. Nonetheless, the offspring presented commercially satisfactory growth rates. Thus, diets containing 28% of digestible protein and 2,800 kcal of digestible energy.kg of diet -1 can be used to feed Nile tilapia broodstock without jeopardizing offspring performance during the sex reversal phase.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Growth of Nile tilapia post-larvae from broodstock fed diet with different levels of digestible protein and digestible energy

Sousa¹,

Freccia²,

Santos

et al. 2013

R. Bras. Zootec.

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“…Similar results were obtained by Cruz & Mair (1994), Guerrero III & Guerrero (1997) and Maine-Pinto et al (2000), which found that 17á-methyltestosterone has little or no effect on the growth and survival of Nile tilapia during the hormonal treatment. According to Bombardelli & Hayashi (2005), the lack of significant difference for weight, length and survival fry among treatments may be due to rapidly metabolized and excretion of hormone causing no anabolic effect. Guerrero III & Guerrero (1997) cite that low levels of androgens may have a positive effect on growth and fry survival of tilapia during treatment period compared with high levels of hormone.…”

Section: Resultsmentioning

confidence: 99%

Growth and survival of tilapia Oreochromis niloticus (Linnaeus, 1758) submitted to different temperatures during the process of sex reversal

2009

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The objective of this research was to evaluate the sex reversal technique using 17 --methyltestosterone (MT) hormone, submitted to temperature modification of fry Nilo tilapia storage, aiming to get the data of sex reversal combined with growth performance and fry survival. The experiment was performed at UFLA Fish Culture Station, using tilapia fry (0,008 ± 0.002 g e 0,9 ± 0.1 cm) obeying a totally randomized experimental delineation in a factorial scheme 4x4, in 4 temperatures (26º, 28º, 30º, 32ºC) and 4 hormonal doses (0, 20, 40, 60mg of MT/kg of ration) during 28 days, with 5 repetitions. As temperature raised, weight gain rate, size and survival increased (p<0.01); however, this temperature raise was not effective in modifying males ratio (p>0.01), which occurred only due to the used hormone treatment. The dose of 40 mg of MT/kg of ration provided similar results to those of 60mg of MT/kg of ration. Hence, the temperature band from 26º to 32ºC does not affect sex reversal rate, but temperatures around 30ºC improves the performance of tilapias related to the growth and survival, and the dose of 40 mg of MT/kg of ration is enough to achieve monosex populations.Index terms: Tilapia, 17 -methyltestosterone, temperature. RESUMOObjetivou-se, neste trabalho, avaliar a técnica de inversão sexual utilizando hormônio 17 -metiltestosterona (MT), submetidas à modificação da temperatura de estocagem das pós-larvas de tilápia, visando obter os melhores dados de inversão sexual aliado à performance de crescimento e sobrevivência das pós-larvas. O experimento foi conduzido na Estação de Piscicultura da UFLA, utilizando pós-larvas (0,008 ± 0,002 g e 0,9 ± 0,1 cm) de tilápia em delineamento experimental inteiramente casualizado em esquema fatorial 4x4, com 4 temperaturas (26º, 28º, 30º e 32ºC) e 4 doses hormonais (0, 20, 40 e 60mg de MT/kg de ração) durante 28 dias, com 5 repetições. À medida que se elevou a temperatura, a taxa de ganho de peso, o tamanho e a sobrevivência foram maiores (p<0,01); entretanto, esse aumento na temperatura não foi suficiente para alterar a proporção de machos (p>0,01), que ocorreu apenas em função do hormônio utilizado. A dose de 40 mg de MT/kg de ração proporcionou resultados semelhantes aos da dose de 60 mg de MT/ kg de ração. Portanto, a faixa de temperatura entre 26º e 32ºC não influencia na taxa de inversão sexual, mas temperaturas em torno de 30ºC melhoram o desempenho das tilápias quanto ao crescimento e à sobrevivência, e a dose de 40 mg de MT/kg de ração é suficiente para a obtenção de populações monossexo.Termos para indexação: Tilápia, 17 -metiltestosterona, temperatura.

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“…No Brasil, em 2000 e 2001, a tilapicultura seguiu a mesma tendência mundial (Borghetti et al, 2003), uma vez que a tilápia foi a principal espécie produzida nos anos de 2002de , 2003de (Crescêncio, 2005 e 2005 (IBAMA, 2007).…”

Section: Introductionunclassified

Desempenho reprodutivo e zootécnico e deposição de lipídios nos hepatócitos de fêmeas de tilápia-do-nilo alimentadas com rações de diversos níveis energéticos

et al. 2009

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RESUMO -Um experimento foi conduzido com o objetivo de avaliar os desempenhos reprodutivo e zootécnico e a deposição de lipídios no tecido hepático de fêmeas de tilápia-do-nilo alimentadas com rações contendo diferentes níveis de energia digestível, obtidos pela inclusão de óleo de soja. Foram utilizados 100 reprodutores e 300 reprodutoras, distribuídos em delineamento inteiramente casualizado com cinco tratamentos e quatro repetições. Os reprodutores, machos e fêmeas, foram alimentados com rações contendo, por quilograma, 35% de proteína bruta e 2.700, 2.950, 3.200, 3.450 ou 3.700 kcal de energia digestível. Os animais foram mantidos em hapas por 93 dias. O desempenho reprodutivo e zootécnico não foi influenciado pelos níveis energéticos das rações, o que pode estar relacionado ao curto período de tempo de alimentação com as dietas experimentais. Contudo, o aumento nos níveis de energia teve efeito linear nas deposições lipídicas nos hepatócitos.Desta forma, os níveis crescentes de energia digestível nas rações fornecidas às fêmeas de tilápia-do-nilo, obtidos pela inclusão de óleo de soja, apenas aumentam o tempo de sobrevivência das larvas ao jejum e a deposição de lipídios nos hepatócitos das fêmeas. Palavras-chave: fígado, nutrição, Oreochromis niloticus, ovários, peixe, reprodução Reproductive and animal performance and lipids deposition in hepatocytes for Nile tilapia females fed different levels of energy in the rationABSTRACT -The experiment was carried out to evaluate the reproductive and animal performance and lipids deposition in the liver tissue of the Nile tilapia female, fed diets containing different levels of digestible energy, obtained by soybean oil inclusion. Three hundred breeding females and 100 breeding males were used, distributed in a completely randomized design with five treatments and four replications. The broods were fed diets containing 35% crude protein and 2,700; 2,950; 3,200;3,450 and 3,700 kcal energy digestible/kg feed. The animals were stocked in hapas for 93 days. The reproductive and animal performance were not influenced by the energy levels. These results may be associated with the short period of time that the brood were fed the experimental diets. However, increasing energy levels caused a linear increase in lipids inclusions in hepatocytes. Thus, the increasing levels of digestible energy provided to Nile tilapia females, obtained by including soybean oil, only promoted increased lipid deposition in hepatocytes.

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Masculinização de larvas de tilápia do Nilo (Oreochromis niloticus L.) a partir de banhos de imersão com 17alfa-metiltestosterona

Cited by 13 publications

References 30 publications

Growth of Nile tilapia post-larvae from broodstock fed diet with different levels of digestible protein and digestible energy

Growth of Nile tilapia post-larvae from broodstock fed diet with different levels of digestible protein and digestible energy

Growth and survival of tilapia Oreochromis niloticus (Linnaeus, 1758) submitted to different temperatures during the process of sex reversal

Desempenho reprodutivo e zootécnico e deposição de lipídios nos hepatócitos de fêmeas de tilápia-do-nilo alimentadas com rações de diversos níveis energéticos

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