Frequências Alimentares do Piaractus brachypomus em Sistema de Recirculação de Água Fechado

Abstract

Fish activity has grown in Brazil and contains native species that have a potential market. The aim of research was evaluate the performance of Pirapitinga (Piaractus brachypomus) in a closed recirculating aquatic recirculation system (RAS). The fingerlings were submitted to different feeding frequencies (once, twice or three times a day) at regular intervals, using a feeding rate to 5.0% of the biomass. Pirapitinga fingerlings with initial weight 8.0±0.2g were stocked in 12 aquariums with 12L, in a randomized block design, with four replications. The experimental period comprised 42 days, and commercial feed containing 45% crude protein for omnivorous fish was used. The means of pH, temperature (°C) and dissolved oxygen (O2) were, respectively; 7.69±0.04; 26.59±0.08°C; 3.68±0.07-1 mg/L. Body weight gain (WG), apparent feed conversion (FCR), specific growth rate (SGR) and condition factor (K) were evaluated. There were higher SGR for the feeding frequency of twice or three times a day (3.47 vs. 3,43%.day-1), and better FCR for the referred frequences (3.57 vs. 3.29). In Pirapitinga (Piaractus brachypomus) fingerlings cultivation, in closed RAS with biomass up to 6g/L, the once feeding frequency is insufficient to suit FCR and SGR.