Reproductive traits in different Nile tilapia genetic groups

Silva, A. C. F.; Filho, Ruy Alberto Caetano Corrêa; Ventura, Arlene Sobrinho; Nunes, André Luiz; Laice, L. M.; Ribeiro, Ricardo Pereira; Oliveira, Carlos Antônio Lopes de; Almeida, Lucas Carvalho de; Barbosa, Phillipe Thiago Leite; Povh, Jayme Aparecido

doi:10.1590/1678-4162-11764

Cited by 7 publications

(2 citation statements)

References 19 publications

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“…Several factors can affect the interval between spawnings, including ambient conditions such as temperature and photoperiod (Campos-Mendoza et al, 2004;Yoshida et al, 2017), nutrition of the breeders (Bombardelli et al, 2017;Sarmento et al, 2018), reproductive management strategies such as egg collection in the mouth of females (Silva et al 2020), and the density and male to female ratio of breeders (Hughes & Behrends, 1983;Lovshin, 1982. ) However, in addition to environmental and management factors, individual genetic traits also in uence the reproductive performance of tilapia.…”

Section: Introductionmentioning

confidence: 99%

Genetic parameter estimates indicate the possibility of genetic gain by selecting for reproductive traits of females from a commercial tilapia population (Oreochromis sp.)

Gonçalves

Ataides

Carvalheiro

et al. 2022

Preprint

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This study aimed to verify the possibility of obtaining genetic gain by selecting breeders based on genetic parameter estimates for reproductive performance traits of female tilapia (Oreochromis sp.) from a commercial population. The study was conducted using a database containing information on reproductive traits collected from 2009 to 2021. During the breeding period, the animals were stocked in tanks in a 1:3 male: female ratio. Eggs were collected from the mouth of the females every five days, and the collected eggs were measured in 100 mL beakers to estimate the egg volume. To estimate the variance components and genetic parameters (heritability, correlation, and repeatability), a mixed animal model was used with the fixed effects of the production cycle and breeding tanks, in addition to the additive direct genetic and permanent environmental random effects. The heritability values were 0.26, 0.18, 0.15, and 0.13 for total egg volume, average egg volume, spawning frequency, and average spawning interval, respectively, with repeatability above 0.43 for all analyzed variables, demonstrating the ability of the evaluated breeds to maintain the same production level during the different cycles. The genetic correlations among the variables were high, with a correlation of -0.99 between the total egg volume and the average spawning interval. Thus, selecting for total egg volume, which had the highest heritability, would result in animals that produce a large volume of eggs and have short spawning intervals.

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Section: Introductionmentioning

confidence: 99%

Genetic parameter estimates indicate the possibility of genetic gain by selecting for reproductive traits of females from a commercial tilapia population (Oreochromis sp.)

Gonçalves

Ataides

Carvalheiro

et al. 2022

Preprint

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“…In turn, aquaculture is a fast-growing sector with a world fish production of 80 MT in 2016, which represents 88% of the world fish production (FAO, 2018). In this sector, the creation of tilapia is included, as the only aquaculture species with a consolidated improvement program in the country, which has contributed to the sharp increase in its production compared to other fish species (Silva et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Economic Viability of Cassava Residues in the Nile Tilapia Diet

Nascimento¹,

Ponciano²,

Alfaiate³

et al. 2021

JAS

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Fish feed represents between 50% and 70% of intensive aquaculture production costs. In this context, the present study aimed to evaluate the economic viability of the production of Nile tilapia under a diet with cassava residues in it. To evaluate the economic efficiency in relation to the inclusion of residues in the tilapia feed, the approximate cost of feed per kilogram of live weight (CMR) gained during the experimental period was determined, and later the cash flow of the production was raised for analysis of indicators: NPV (Net Present Value), CBI (Cost Benefit Rate), and IRR (Internal Rate of Return) submitted to different discount rates from existing financing sources in the region. It was found that tilapia under the diet with the inclusion of tapioca sweep in the diet, showed greater economic efficiency, and consequently higher NPV (R $ 4,583.33), IRR (15%) and CBR (1.17). In this sense, the viability analysis showed that cassava residues in diets of tilapia diets, indicate to be a viable strategy to better develop aquaculture production, in a more sustainable way, enhancing the technical and economic viability and minimizing the environmental impacts.

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