%0 Journal Article
%T Characterization of effluents from bullfrog (Lithobates catesbeianus, Shaw, 1802) grow-out ponds Caracteriza  o de efluentes de viveiros de engorda de r -touro (Lithobates catesbeianus, Shaw, 1802)
%A Fernanda de Freitas Borges
%A Luiz Augusto do Amaral
%A Marta Verardino De St¨¦fani
%J Acta Limnologica Brasiliensia
%D 2012
%I 
%X AIM: Current analysis characterizes the effluent from bullfrog-rearing ponds during the grow-out phase; METHODS: Temperature, pH, dissolved oxygen, electric conductivity, turbidity, total phosphorus, N-NH3, N-NO3, BOD5 and COD and the number of thermotolerant coliforms (Escherichia coli) of the inlet and outlet water of the ponds were analyzed twice a week. Assay consisted of a completely randomized experimental design with two treatments (inlet and outlet water) and six repetitions in a split-plot, coupled to collection over time as subplot; RESULTS: All variables were significantly different (p < 0.05) between treatments and over time (p < 0.05). Average rates of temperature, pH and dissolved oxygen levels of the supply water were higher when compared to those of the effluent. The other variables such as conductivity, turbidity, total phosphorus, ammonia, nitrate, biological oxygen demand, chemical oxygen demand and E. coli were higher in the effluent when compared to rates in the supply water; CONCLUSIONS: The management during grow-out phase caused the deterioration of the water quality, with increasing levels of dissolved nutrients and the number of thermotolerant coliform. Ammonia and phosphorus levels in the effluent, caused by waste food, skin and feces, accelerate the eutrophication process of the receiving water body. Further studies on effluent treatment are required. OBJETIVO: Caracterizar a qualidade do efluente na fase de engorda da r -touro; M¨¦TODOS: Quinzenalmente foram mensurados a temperatura, pH, oxig¨ºnio dissolvido, condutividade el¨¦trica, turbidez, PT, N-NH3, N-NO3, DBO5, DQO e n¨²mero de coliformes termotolerantes (Escherichia coli) da ¨¢gua de abastecimento e do efluente das baias de cria  o. O delineamento experimental utilizado foi o inteiramente casualizado com dois tratamentos (¨¢gua de entrada e sa¨ªda das baias) e seis repeti  es, em esquema de parcelas subdivididas, sendo as subparcelas as coletas no tempo; RESULTADOS: Todas as vari¨¢veis apresentaram diferen a significativa (p < 0,05) para os tratamentos e entre as coletas (p < 0,05). Os valores m¨¦dios de temperatura, pH e oxig¨ºnio dissolvido da ¨¢gua de abastecimento das baias foram superiores aos do efluente. As demais vari¨¢veis; condutividade el¨¦trica, turbidez, f¨®sforo total, am nia, nitrato, demanda bioqu¨ªmica de oxig¨ºnio, demanda qu¨ªmica de oxig¨ºnio e E. coli foram superiores no efluente, em rela  o ¨¤ ¨¢gua de abastecimento; CONCLUS ES: O manejo realizado na fase de engorda de r -touro deteriora a qualidade da ¨¢gua utilizada, aumentando as concentra  es de nutrientes dissol
%K eutrofiza  o
%K nutrientes
%K ranicultura
%K qualidade de ¨¢gua
%K eutrophication
%K nutrients
%K raniculture
%K water quality
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2012000200005