Ultraviolet radiation and water salinization on recirculating aquaculture systems

Authors

  • Lucas Pedro Gonçalves Junior Universidade Federal de Minas Gerais, Escola de Veterinária, Departamento de Zootecnia, Laboratório de Aquacultura, Avenida Antônio Carlos, no 6.627, CEP 31270-901 Belo Horizonte, MG.
  • Bernardo Santos Lara Universidade Federal de Minas Gerais, Escola de Veterinária, Departamento de Zootecnia, Laboratório de Aquacultura, Avenida Antônio Carlos, no 6.627, CEP 31270-901 Belo Horizonte, MG.
  • Samuel Alves de Carvalho Universidade Federal de Minas Gerais, Escola de Veterinária, Departamento de Zootecnia, Laboratório de Aquacultura, Avenida Antônio Carlos, no 6.627, CEP 31270-901 Belo Horizonte, MG.
  • Carlos Augusto Gomes Leal Universidade Federal de Minas Gerais, Escola de Veterinária, Departamento de Medicina Veterinária Preventiva, Laboratório de Doenças de Animais Aquáticos, Avenida Antônio Carlos, no 6.627, CEP 31270-901 Belo Horizonte, MG.
  • Kleber Campos Miranda Filho Universidade Federal de Minas Gerais, Escola de Veterinária, Departamento de Zootecnia, Laboratório de Aquacultura, Avenida Antônio Carlos, no 6.627, CEP 31270-901 Belo Horizonte, MG.
  • Henrique César Pereira Figueiredo Universidade Federal de Minas Gerais, Escola de Veterinária, Departamento de Medicina Veterinária Preventiva, Laboratório de Doenças de Animais Aquáticos, Avenida Antônio Carlos, no 6.627, CEP 31270-901 Belo Horizonte, MG.
  • Ronald Kennedy Luz Universidade Federal de Minas Gerais, Escola de Veterinária, Departamento de Zootecnia, Laboratório de Aquacultura, Avenida Antônio Carlos, no 6.627, CEP 31270-901 Belo Horizonte, MG.

DOI:

https://doi.org/10.1590/S1678-3921.pab2020.v55.26724

Keywords:

Oreochromis niloticus, ammonia, bacterial load, biofilter, nitrite

Abstract

The objective of this work was to evaluate the effects of ultraviolet radiation (UV) and water salinity on nitrification, water quality, bacterial load, and juvenile tilapia growth in recirculating aquaculture systems (RASs). The experimental period was divided into two phases. The first one lasted 20 days and evaluated the effects of salinity (0 and 2 g L-1) and UV (with or without) on water quality during the period of substrate colonization by nitrifying bacteria. In the second phase, after the storage of juvenile tilapia, the effects of the same experimental factors were evaluated on water quality, bacterial load, and fish growth performance. The RASs employed were efficient for ammonia removal, regardless of the treatments used. During the experimental period, the nitrite concentrations increased linearly, with a more pronounced increase after fish storage until 30 days of the experiment. There were no significant effects of UV, salinity, or the interaction of both on total ammonia, nitrite, and alkalinity. The low levels of salinity (2 g L-1) and UV did not affect the nitrification process and fish performance. The use of UV is efficient to reduce the bacterial load of recirculating aquaculture systems. 

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Published

2020-08-13

How to Cite

Gonçalves Junior, L. P., Lara, B. S., Carvalho, S. A. de, Leal, C. A. G., Miranda Filho, K. C., Figueiredo, H. C. P., & Luz, R. K. (2020). Ultraviolet radiation and water salinization on recirculating aquaculture systems. Pesquisa Agropecuaria Brasileira, 55(X), e01804. https://doi.org/10.1590/S1678-3921.pab2020.v55.26724

Issue

V.55, Jan./Dec., 2020 :Continuos publication

Section

AQUACULTURE