<b>Physical and chemical water parameters and <i>Streptococcus</i> spp. occurrence in intensive tilapia farming in the State of Espírito Santo, Brazil</b> - doi: 10.4025/actascibiolsci.v35i1.11797

  • Maria Isabel Suhet Faculdade de Ciências Agrárias e Veterinárias
  • Ruben Pablo Schocken-Iturrino Faculdade de Ciências Agrárias e Veterinárias
Palavras-chave: lake, aquaculture standards, net cage

Resumo

This study evaluated the influence of intensive farming of tilapia on physical and chemical parameters and on the occurrence of Streptococcus spp. in the water of the lake and of cages. Throughout a year, monthly samplings were taken in the rainy and dry seasons for a year, at two sampling sites, lake and net cages. For the determination of water quality, physical and chemical water parameters were evaluated and compared to the standards established by Conama Resolution no. 357/2005. The presence of Streptococcus spp. in the water was determined by plating on blood Agar and biochemical screening. Mean values of water parameters were tested using the Kruskal-Wallis test comparing sampling sites and seasons. Ammoniacal nitrogen (ammoniacal-N), total phosphorus (total-P) levels and occurrence of Streptococcus spp. have increased in the water of the net cages. The mean values of several parameters have decreased during the rainy period, except for pH, temperature and ammoniacal-N. Total-P and dissolved oxygen levels, during dry and rainy periods, respectively, exceeded the standard established for freshwater class 2, recommended for aquaculture, which can be harmful to the fish. Therefore, constant monitoring of the physical,chemical and microbiological water parameters is recommended since the Juara lake is also used for recreational purposes.

 

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Biografia do Autor

Maria Isabel Suhet, Faculdade de Ciências Agrárias e Veterinárias
Programa de Pós-Graduação em Microbiologia Agropecuária - FCAV/UNESP
Ruben Pablo Schocken-Iturrino, Faculdade de Ciências Agrárias e Veterinárias
Departamento de Microbiologia Agropecuária - FCAV/UNESP
Publicado
2012-07-19
Como Citar
Suhet, M. I., & Schocken-Iturrino, R. P. (2012). <b>Physical and chemical water parameters and <i>Streptococcus</i> spp. occurrence in intensive tilapia farming in the State of Espírito Santo, Brazil</b&gt; - doi: 10.4025/actascibiolsci.v35i1.11797. Acta Scientiarum. Biological Sciences, 35(1), 29-35. https://doi.org/10.4025/actascibiolsci.v35i1.11797
Seção
Aquicultura e Recursos Pesqueiros

 

0.6
2019CiteScore
 
 
31st percentile
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0.6
2019CiteScore
 
 
31st percentile
Powered by  Scopus