ESTUDO DE CASO SOBRE ASPECTOS DA ATIVIDADE DA PISCICULTURA NA MICROBACIA DO RIO DOS BOIS EM CEZARINA/GO

Abstract

A study of parameters that act on water quality in micro-watershed dug ponds is important because it enables a holistic approach aimed to promote better activity management and provide considerable information about the ecosystems involved. The aim of this study was to quantify physical and chemical parameters of water in dug ponds (small dams and tanks) of fish within a micro-watershed during a diurnal cycle. The field work was performed at days 08, 13, 18 and 23 of July 2009 in a small catchment of the Rio dos Bois, in the municipality of Cezarina, State of Goiás. The sampling occurred over a period of 24 hours with the collection every 6 hours in two different sites: the upstream and downstream of the ponds. To characterize the water quality parameters it was analyzed: weather temperature, water temperature, transparency, ammonia, hardness, alkalinity, dissolved oxygen, pH and orthophosphate. Comparing the parameters of water quality upstream and downstream of the ponds in the study, the figures show that there was no statistically significant differences ( > 0.05) between the points for the variable ambient temperature, water temperature, transparency, ammonia, hardness, alkalinity, dissolved oxygen and orthophosphate and showed a statistically significant ( <0.05) for the parameter pH. To optimize culture conditions, we suggest some techniques of Good Management Practices (GMP) adopted in aquaculture.