Avaliação da qualidade de efluentes na criação de rã-touro (Lithobates catesbeianus)
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Data
2010-07-12
Autores
Borges, Fernanda de Freitas [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
O estudo foi realizado no Setor de Ranicultura do Centro de Aquicultura da Universidade Estadual Paulista, Câmpus Jaboticabal/SP em dois períodos distintos, compreendendo uma fase de girinagem e uma fase de engorda no ciclo de criação de rã-touro. Os objetivos foram verificar as características físicas, químicas e microbiológicas da água de entrada e de saída dos tanques em cada fase do ciclo. Os resultados obtidos foram comparados com a legislação ambiental CONAMA 357 de 2005, para verificar se o manejo utilizado em cada fase causa alterações na qualidade da água. Foram analisadas as variáveis temperatura, pH, oxigênio dissolvido, condutividade elétrica, turbidez, nitrogênio amoniacal, nitrato, fósforo total, DBO5, DQO e Escherichia coli em cada etapa do ciclo. O delineamento experimental foi o Inteiramente Casualizado, com dois tratamentos, água de abastecimento e efluente e seis repetições (tanques) em um esquema de parcelas subdivididas, sendo as sub-parcelas as coletas no tempo. As coletas das amostras foram realizadas a cada quinze dias no período da manhã. Na fase de girino o experimento foi realizado entre novembro de 2008 e janeiro de 2009 e teve duração de 76 dias, até os animais completarem a metamorfose. Não foi observada diferença significativa (p>0,05) entre os tratamentos para temperatura, condutividade, turbidez, DQO e E. coli. Entretanto, esses parâmetros variaram nas diferentes coletas. As variáveis pH, oxigênio dissolvido, fósforo total, amônia, nitrato e DBO5 tiveram diferença significativa (p<0,05) entre os tratamentos. Porém, somente as concentrações de fósforo total e DBO5 encontraram-se acima da recomendada pela legislação. A fase de recria teve duração de 77 dias, compreendendo o período de novembro de 2009 a janeiro de 2010, até os animais atingirem o peso de abate. Todas as análises apresentaram diferença significativa...
The study was performed at the frog culture Sector, Aquaculture Center, Sao Paulo State University, Campus Jaboticabal, SP in two different periods, including a tadpole and growout phase in the cycle of creation of the bullfrog. The objectives were to verify the physical, chemical and microbiological water inlet and outlet of the tanks at each stage of the cycle. The results were compared with environmental legislation CONAMA 357, by 2005, to verify whether management used at each stage cause changes in water quality. The variables temperature, pH, dissolved oxygen, electrical conductivity, turbidity, ammonia nitrogen, nitrate, total phosphorus, BOD5, COD and E. coli at each stage of the cycle. The experimental design was completely random, with two treatments, water supply and sewage and six repetitions (tanks) in a split plot, and the sub-plots samples collected over time. The collections of samples were taken fortnightly during the morning. At tadpole phase, the experiment was conducted between November 2008 and January 2009 and lasted 76 days until the animals complete metamorphosis. There was no significant difference (p> 0.05) among treatments for temperature, conductivity, turbidity, COD and E. coli. However, these parameters varied in different samples. The pH, dissolved oxygen, total phosphorus, ammonia, nitrate and BOD5 were significantly different (p<0.05) among treatments. But, only the concentrations of total phosphorus and BOD5 were found above the recommended legislation. The growing phase lasted 77 days, including the period November 2009 to January 2010, until the animals reach slaughter weight. All analysis showed significant differences (p<0.05) among treatments and between collections. The variables, dissolved oxygen, total phosphorus, ammonia, BOD5 and E. coli had their values above those permitted by law... (Complete abstract click electronic access below)
The study was performed at the frog culture Sector, Aquaculture Center, Sao Paulo State University, Campus Jaboticabal, SP in two different periods, including a tadpole and growout phase in the cycle of creation of the bullfrog. The objectives were to verify the physical, chemical and microbiological water inlet and outlet of the tanks at each stage of the cycle. The results were compared with environmental legislation CONAMA 357, by 2005, to verify whether management used at each stage cause changes in water quality. The variables temperature, pH, dissolved oxygen, electrical conductivity, turbidity, ammonia nitrogen, nitrate, total phosphorus, BOD5, COD and E. coli at each stage of the cycle. The experimental design was completely random, with two treatments, water supply and sewage and six repetitions (tanks) in a split plot, and the sub-plots samples collected over time. The collections of samples were taken fortnightly during the morning. At tadpole phase, the experiment was conducted between November 2008 and January 2009 and lasted 76 days until the animals complete metamorphosis. There was no significant difference (p> 0.05) among treatments for temperature, conductivity, turbidity, COD and E. coli. However, these parameters varied in different samples. The pH, dissolved oxygen, total phosphorus, ammonia, nitrate and BOD5 were significantly different (p<0.05) among treatments. But, only the concentrations of total phosphorus and BOD5 were found above the recommended legislation. The growing phase lasted 77 days, including the period November 2009 to January 2010, until the animals reach slaughter weight. All analysis showed significant differences (p<0.05) among treatments and between collections. The variables, dissolved oxygen, total phosphorus, ammonia, BOD5 and E. coli had their values above those permitted by law... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Efluente - Qualidade, Rã touro, Girino, Lithobates catesbeianus, Ranicultura, Effluent, Bullfrog, Tadpoles, Lithobates catesbeianus, Frog culture
Como citar
BORGES, Fernanda de Freitas. Avaliação da qualidade de efluentes na criação de rã-touro (Lithobates catesbeianus). 2010. v, 85 f. Dissertação (mestrado) - Universidade Estadual Paulista, Centro de Aquicultura, 2010.