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Production of Oocytes of Nile Tilapia (Oreochromis niloticus) for In Vitro Fertilization via Hormonal Treatments

Authors

  • AFA Fernandes,

    1. Laboratório de Aquacultura (LAQUA), Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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    • Both authors contributed equally to this work.
  • ÉR Alvarenga,

    1. Laboratório de Aquacultura (LAQUA), Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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    • Both authors contributed equally to this work.
  • DAA Oliveira,

    1. Laboratório de Aquacultura (LAQUA), Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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  • CG Aleixo,

    1. Laboratório de Aquacultura (LAQUA), Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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  • SA Prado,

    1. Laboratório de Aquacultura (LAQUA), Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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  • RK Luz,

    1. Laboratório de Aquacultura (LAQUA), Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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  • NLAF Sarmento,

    1. Laboratório de Aquacultura (LAQUA), Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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  • EA Teixeira,

    1. Laboratório de Aquacultura (LAQUA), Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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  • MR Luz,

    1. Laboratório de Aquacultura (LAQUA), Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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  • EM Turra

    Corresponding author
    1. Laboratório de Aquacultura (LAQUA), Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
    • Author's address (for correspondence): EM Turra, Laboratório de Aquacultura (LAQUA), Escola de Veterinária da Universidade Federal de Minas Gerais, Av. Antônio Carlos, no 6627, Caixa Postal 567, Campus da UFMG, CEP 30123-970, Belo Horizonte, MG, Brazil. E-mail: eduardoturra@yahoo.com.br

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Contents

Only a few studies have described hormonal treatments for induction of synchronicity and gamete collection in Nile tilapia (Oreochromis niloticus), both important for assortative matings in breeding programmes and essential for polyploidy technologies. In this study, we compared the effectiveness of carp pituitary extract (CPE), Nile tilapia pituitary extract (TPE), human chorionic gonadotropin (hCG) and gonadotropin-releasing hormone (GnRH) protocols on the induction of spawning and egg production in Nile tilapia. Among the hormonal treatments analysed, only hCG was effective for producing viable gametes for in vitro fertilization. To verify the viability of this hormonal treatment, hCG was tested using different doses (1000, 2000, 3000, 4000 and 5000 IU/kg) in a large number of females (208 animals) from two Nile tilapia lines. The results indicated that hCG doses between 1000 and 5000 IU/kg could be used to induce final oocyte maturation in Nile tilapia with collection of stripped oocytes. This is the first study to report differential reproductive responses to hormonal treatment between tilapia lines: line 1 was more efficient at producing eggs and post-hatching larvae after hCG induction than line 2. In conclusion, we demonstrated that the hCG protocol may be applied on a large scale to induce final oocyte maturation in Nile tilapia. The development of a protocol for in vitro fertilization in Nile tilapia may aid in breeding programmes and biotechnological assays for the development of genetically modified lines of Nile tilapia.

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