Dinâmica temporal da qualidade da água em viveiros de camarão marinho durante um ciclo de cultivo

Abstract

The continuous water renewal, which the shrimp farms require, creates a serious problem of effluent discharge. They are closely linked to excess organic matter, thus causing a serious risk of environmental degradation. In this context, the present work evaluated the temporal dynamics of limnological variables in shrimp nurseries during a growing cycle. The research was carried out in two nurseries at Fazenda Costa Dourada Camarões Ltda., Located in the municipality of Sirinhaém, on the southern coast of Pernambuco, 75km from Recife. The cultivation cycle lasted 96 days, where the main environmental variables were monitored in situ and weekly water samples were collected for laboratory analysis, as well as two nictemeric cycles and monitoring of the expenditure in the two nurseries of the studied farm. The variables monitored in situ included temperature, pH, dissolved oxygen, salinity, conductivity and dissolved total solids through portable field monitors. In the laboratory, the concentrations of chlorophyll-a, nitrate, nitrite, ammonia, total phosphorus, total phosphate, orthophosphate and alkalinity were analyzed. All hydrobiological variables were analyzed in the Laboratory of Limnology of the Department of Fisheries of UFRPE. The results of the analyzes showed that the effluents of the farm, in relation to total phosphorus and total phosphate, presented high values, with potential impact on the recipient estuary. Therefore, monitoring in the region is necessary in order to subsidize information of great importance for the practice of sustainable shrimp farming.