&lt;b&gt;Effects of photoperiod on somatic growth and gonadal development in male nile tilapia

Navarro, Rodrigo Diana; Souza, Samatha Campos; Bizarro, Yvonaldo Wlademir Saldanha; Fortes‐Silva, Rodrigo; Navarro, Fernanda Keley Silva Pereira

doi:10.4025/actascitechnol.v37i4.26880

Cited by 13 publications

(7 citation statements)

References 20 publications

(5 reference statements)

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“…In our study, the GSI of red tilapia reared under different photoperiod regimes was not significant different, similar to the results obtained in Nile tilapia by previous authors (Navarro, Sousa, Wlademir, & Bizarro, 2015;Zutshi & Singh, 2017 et al, 2006). The results of photoperiods on GSI of tilapia are still confusing and inconsistency.…”

Section: Discussionsupporting

confidence: 92%

“…In our study, the GSI of red tilapia reared under different photoperiod regimes was not significant different, similar to the results obtained in Nile tilapia by previous authors (Navarro, Sousa, Wlademir, & Bizarro, ; Zutshi & Singh, ). In contrary, other studies have obtained high GSI and high spawning rate in O. niloticus reared under prolonged light (Campos‐Mendoza & Mcandrew, ; Rad et al, ).…”

Section: Discussionsupporting

confidence: 92%

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Effects of photoperiod on growth performance and melanogenesis pathway for skin pigmentation of Malaysian red tilapia

Atuganile

Zhu

et al. 2020

Aquac Res

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Farming of red tilapia is increasing rapidly. However, its commercial farming development is challenged by lack of clear information on genetic basis for skin colour and pigmentation differences due to environmental changes. This study investigated the effects of photoperiod (light:dark, L:D) on the growth and skin colour variation of Malaysian red tilapia. A total of 180 fish weighing 150.48 ± 0.44 g were reared under natural photoperiod (13L:11D, control), prolonged lightness (24L:0D) and prolonged darkness (0L:24D) in three replicates for 78 days. The weight gain of fish cultured under both prolonged light and darkness were significantly higher than fish under natural photoperiod. The tyrosinase level in ventral skin was significantly higher for fish cultured under prolonged darkness condition than in the other two photoperiod regimes. Contrary, the cysteine level in the dorsal skin was significantly higher in the fish cultured under natural photoperiod than in prolonged light and darkness. The relative mRNA expressions of SRY‐related HMG‐Box 10 (sox 10), tyrosine (tyr), tyrosine‐related protein 1 (tyrp‐1) and solute carrier family 7 member 11 (slc7a11) genes were significantly higher in ventral skin of fish under prolonged darkness than the other two photoperiods. This study demonstrates that photoperiod has an impact on melanogenesis and growth of red tilapia. Understanding the effects of photoperiod on genetic basis of red tilapia will help in selective breeding programme of the important economic traits for the development of commercial red tilapia farming.

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Section: Discussionsupporting

confidence: 92%

“…In our study, the GSI of red tilapia reared under different photoperiod regimes was not significant different, similar to the results obtained in Nile tilapia by previous authors (Navarro, Sousa, Wlademir, & Bizarro, ; Zutshi & Singh, ). In contrary, other studies have obtained high GSI and high spawning rate in O. niloticus reared under prolonged light (Campos‐Mendoza & Mcandrew, ; Rad et al, ).…”

Section: Discussionsupporting

confidence: 92%

Effects of photoperiod on growth performance and melanogenesis pathway for skin pigmentation of Malaysian red tilapia

Atuganile

Zhu

et al. 2020

Aquac Res

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“…In the microscopic analysis of gonads (Figure 1), we observed a dynamic spermatogenesis process, as described by Navarro, Sousa, Bizarro, and Navarro (2015) for the same species. No significant difference between treatments was detected for seminiferous tubules and intertubular space (Table 3).…”

Section: Resultsmentioning

confidence: 93%

<b>Vitamin C supplementation on growth performance and gonadal development in Nile tilapia

et al. 2016

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ABSTRACT. The study aimed to verify the vitamin C supplementation on performance and gonadal development of Nile tilapia. 160 fingerlings distributed in 16 tanks with 65 L capacity and constant water renewal in a closed recirculation system were used. The design was completely randomized with four treatments (0, 150, 300, and 600 mg of monophosphate L-ascorbic acid kg -1 diet) and four replications. We evaluated the weight gain parameters, apparent feed conversion, apparent feed intake and carcass yield to evaluate of production performance. We analyzed the sexual maturation stage and gonadosomatic index (GSI) to evaluate reproductive performance. There was no statistical difference in the performance parameters. It was observed significant difference to the GSI. No significance was found regarding other reproduction parameters. We recommend the use of 150 mg kg Suplementação de vitamina C sobre o desempenho e desenvolvimento gonadal de tilápia-do-Nilo RESUMO. O estudo objetivou verificar a suplementação de vitamina C sobre o desempenho produtivo e desenvolvimento gonadal da tilápia-do-Nilo. Foram utilizados 160 alevinos, distribuídos em 16 aquários com capacidade de 65 L e renovação de água constante em sistema fechado de recirculação. O delineamento foi inteiramente casualizado com quatro tratamentos (0, 150, 300, e 600 mg de monofosfato de ácido L-ascórbico kg -1 de ração ) e quatro repetições. Foram avaliados os parâmetros de ganho em peso, conversão alimentar aparente, consumo aparente de ração e rendimento de carcaça para avaliação de desempenho produtivo. Foram analisados o estádio de maturação sexual e índice gonadossomático (IGS) para avaliação de desempenho reprodutivo. Não houve diferença estatística para os parâmetros de desempenho. Foi observado diferença significativa para o índice gonadossomático. Não foi observada significância em relação a outros parâmetros reprodutivos. Recomenda se a utilização de 150 mg kg -1 de Vitamina C à ração de tilápia-do-Nilo para o índice reprodutivo.Palavras-chave: ácido ascórbico, Oreochromis niloticus, reprodução.

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“…Os efeitos são divididos em primários, secundários e terciários. Entre os efeitos primários encontram-se os aumentos de catecolaminas, adrenalina e noradrenalina, e corticosteroides no plasma (NAVARRO et al, 2015).…”

Section: Desenvolvimentounclassified

Importância Das Cores No Crescimento, Bem-Estar E Reprodução De Peixes

Navarro

2017

ArqVet

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NAVARRO, R. D. Importância das cores no crescimento, bem-estar e reprodução de peixes. Arq. Ciênc. Vet. Zool. UNIPAR, Umuarama, v. 20, n. 1, p. 45-48, jan./mar. 2017. RESUMO:O Brasil possui alto potencial para piscicultura devido às suas condições ambientais favoráveis à elevada diversidade de espécies nativas com potencial para corte e para ornamentação e à vasta disponibilidade de recursos hídricos. Os estímulos ambientais são cruciais na modulação do ciclo de vida dos animais e, dessa forma, as modificações inerentes a cor do ambiente pode afetar o comportamento e o desenvolvimento dos peixes. Poucos estudos têm sido dedicados ao entendimento dos efeitos do fundo ou cor de luz sobre a biologia dos peixes. Objetivou-se fazer uma revisão bibliográfica sobre os efeitos das cores no bem-estar, na reprodução e no crescimento dos peixes. A luminosidade, por exemplo, é uma condição ambiental essencial para a sobrevivência dos peixes. A luz também é o principal fator responsável pelo controle do ritmo biológico dos animais. A resposta ao estresse corresponde a uma série de alterações fisiológicas. Os efeitos são divididos em primários, secundários e terciários. A manipulação deste sincronizador ambiente pode auxiliar na produção e na qualidade do pescado dentro da área de piscicultura. O efeito das cores sobre o desempenho produtivo e reprodutivo de peixes dependerá dentre outros fatores, da espécie a ser estudada, do sexo e do estágio de desenvolvimento dessa espécie, e é de suma importância para melhor o bem-estar dos animais e obter maiores rendimentos no setor de piscicultura. PALAVRAS-CHAVE: Condições ambientais. Comportamento. Desempenho. IMPORTANCE OF COLORS ON GROWTH, WELFARE AND REPRODUCTION OF FISHABSTRACT: Brazil has a high potential for fish farming due to its favorable environmental conditions to a high diversity of native species with potential for food consumption and for decoration, as well as its vast availability of water resources. Environmental stimuli are crucial in modulating the life cycle of animals, and therefore the inherent color changes of the environment can affect the behavior and development of fish. Few studies have been devoted to understanding the effects of background or light color on fish biology. The purpose of this paper was to make a literature review on the theme of color effects on fish welfare, reproduction and growth. Brightness, for instance, is an essential environmental condition for fish survival. Light is also one of the main factors responsible for controlling the biological rhythm of those animals. Stress response corresponds to a series of physiological changes, with their effects being divided into primary, secondary and tertiary. The manipulation of this environmental synchronizer can aid in the production and quality of fish within the fish farming area. The effect of colors on the productive and reproductive performance of fish species under study depends, among other factors, on the sex and development stage of this species, and is of paramount importance for b...

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<b>Effects of photoperiod on somatic growth and gonadal development in male nile tilapia

Cited by 13 publications

References 20 publications

Effects of photoperiod on growth performance and melanogenesis pathway for skin pigmentation of Malaysian red tilapia

Effects of photoperiod on growth performance and melanogenesis pathway for skin pigmentation of Malaysian red tilapia

<b>Vitamin C supplementation on growth performance and gonadal development in Nile tilapia

Importância Das Cores No Crescimento, Bem-Estar E Reprodução De Peixes

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