The impact of food management of matrinxã (Brycon amazonicus) (Spix & Agassiz, 1829) on zootechnical performance and the water quality in dugout nurseries

Abstract

A concern for fish farming is the need to develop technologies, as they may provide greater weight gain, feed conversion improvement and impact minimization on water quality. Considering the importance of studies of this nature, this study aimed to evaluate the impacts of two types of food management: food supply with restriction, through of the use of the table corresponding to treatment 1 (T-1) and food supply ad libitum corresponding to treatment 2 (T-2), in cultivation of matrinxã (Brycon amazonicus). The zootechnical performance of the species and water quality were evaluated. For this, 626 homogeneous matrinxã fingerlings were stored, selected from the same batch, with an average weight of 2.8 to 3 grams, which were stored in 6 nurseries, with a density of 1.2 m2 for each fish, proportionally. Water analysis were carry out using the probe YSI-6600 multiparameter in situ and in laboratory. Results: For the zootechnical performance data obtained, such as Weight Gain (WG); Average Size (AS); Daily Weight Gain (DWG); Ration Consumption (RC) and Apparent Food Conversion (AFC), feeding management determined a significant difference for the (RC) and (AFC) with best result in (T-1). For water analysis data, the variables analysed remained within the conditions provided by CONAMA Resolution 357/2005 of the Brazil, except for soluble orthophosphate and total phosphorus. In conclusion, it is recommended that the food supply, with and scheduled feeding, and with a feeding frequency of twice to four times a day be used, depending on the stage of the cultivation's development.