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| Format: | Artículo científico |
| Language: | en |
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Universidade Estadual de Maringá
2015
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| Online Access: | https://www.redalyc.org/articulo.oa?id=303141017002 |
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Table of Contents:
- Reproduction performance of female Nile tilapia under different environments and age classes Grazyella Massako Yoshida Carlos Antonio Lopes de Oliveira Natalí Miwa Kunita Gabriel Soriani Rizzato Ricardo Pereira Ribeiro Agrociencias spawning volume of eggs Oreochromis niloticus Current assay verifies the repr oductive performance of females of Nile tilapia in different age classes and reproductive environments. Four h undred and fifty-one females were evaluated in two different Brazilian environments, namely in Maringá, Paraná State, Brazil (Site 1 - hapas of 10 m 3 and Site 2 - hapas of 1 m 3 ) and in one environment in Alfenas, Minas Gerais State, Brazil (Site 3 – hapas of 14 and 28 m 3 ). The females were divided into three age classes, corre sponding to animals under one year (age 1); between one to two years (age 2); and over three years old (age 3). Spawning was veri fied once a week, from October 2012 to March 2013, corresponding to a 23-w eek assessment. The statistical analyses were performed with Proc Genmod from the statistical program SAS. Site 2 had the lowest results when compared to the other sites for multiple spawning, spawning frequency and volume of eggs/female for animals of age 2. Statistical differences were not dete cted between ages 1 and 2 fo r the same assessment site, although females at age 3 in Site 3 provided higher results than those at age 2. Results show that, precluding the use of animals in individual hapas (1 m³) and maintaining older females in the stock, may improve reproduction results. 2015 artículo científico 1806-2636 https://www.redalyc.org/articulo.oa?id=303141017002 en http://www.redalyc.org/revista.oa?id=3031 Acta Scientiarum. Animal Sciences application/pdf Universidade Estadual de Maringá Acta Scientiarum. Animal Sciences (Brasil) Num.3 Vol.37