FAULTS IN MANAGEMENT IN THE FATTENING PHASE OF TILAPIA AND ITS RELATIONSHIP WITH DIFFERENCE IN FINISH WEIGHT

Abstract

Current analysis was undertaken in the western region of the state of Paraná, Brazil, an agro-stockbreeding reference center in fish production, characterized by 17 fish abattoirs and industries. The study informs the producer on fattening of fish lots and analysis of ponds´ water quality to verify faults in management that contribute towards the difference in fish finishing size. Six ponds in four small farms in the municipality of Toledo PR Brazil were monitored during five months (October 2018 – February 2019). Samples with 50 specimens per pond were used for biometry, weighed and measured individually. Weight difference was calculated by sample standard deviation of each lot. Multiparameter probe measured temperature, pH, electric conductivity, dissolved total solids, dissolved oxygen and turbidity. Results showed strong relationship between turbidity, total dissolved solids and electric conductivity and difference in tilapia size. Over population in the ponds was also detected. Standard deviation of weight increased according to fish growth. Results show that water quality directly affects the development of fish and lack of proper management contributes towards an increase in differences in tilapia weight and size.