Abstract
ABSTRACT This study evaluated the effects of feeding frequency and feeding rate on productive performance of hybrid surubims reared in cages with automatic feeding. Three feeding frequencies (6, 12 and 24 meals day-1), and two feeding rates (4% and 8% of body weight per day, BW day-1) were evaluated. Hybrid surubims (Pseudoplatystoma corruscans × Pseudoplatystoma fasciatum) with average weights of 24.20 ± 0.80 g were distributed in 18 cages of 1.0 m³ at a density of 60 fish m-3. Fish were fed commercial ration containing 40% crude protein, and feeding took place at night using automatic feeders. The study lasted 47 days. With a feeding rate of 4% BW day-1, the final weight (FW) of the surubims was higher when feed was supplied as 24 meals day-1 (66.92 g). However, using 8% BW day-1, the FW was greater with a feeding frequency of 12 meals day-1 (106.90 g). Regardless of feed frequency, the values of daily weight gain and standard length of surubims were higher with the feeding rate of 8% BW day-1. Therefore, the feeding rate of 8% BW day-1, provided in 12 meals day-1, provided better productive performance for hybrid surubims (Pseudoplatystoma corruscans × Pseudoplatystoma fasciatum) reared in cages.
Highlights
Surubims (Pseudoplatystoma spp.) are freshwater fish that have good meat quality and are considered highly valuable fish in Brazil (INOUE et al, 2009)
The aim of this study was to evaluate the effects of two feeding rates, one close to what is usually offered in commercial fish farms of surubims (4% of body weight per day), and another above this value (8% of body weight per day), divided into 6, 12 or 24 meals day-1, on productive performance of hybrid surubims reared in cages with automatic feeding
Surubims fed at a feeding rate of 4% BW day-1 had better growth with more frequent feeding, with higher values of final weight (FW) for the frequency of 24 meals day-1 (Table 1)
Summary
Surubims (Pseudoplatystoma spp.) are freshwater fish that have good meat quality and are considered highly valuable fish in Brazil (INOUE et al, 2009). The Pseudoplatystoma genus has three species: P. corruscans, native to the Paraná basin and São Francisco; P. fasciatum, present in the basins of Paraná and Amazon; and P. tigrinum, native to the Amazon basin (BALDISSEROTO; GOMES, 2005). The strain usually marketed is the hybrid between P. corruscans × P. fasciatum (CREPALDI et al, 2006). Since the 2000s, the use of hybrids in fish farming has received special attention, as hybridization may be used in order to take advantage of the favorable characteristics of the parental species, as well as improving performance of fish reared in captivity (FAUSTINO et al, 2007). The optimization of feed management techniques is important in order to be able to take full advantage of the potential growth of hybrid strains. According to Schnaittacher, King and Berlinsky (2005), optimizing feed management strategies in fish production is important for maximizing growth, improving feed conversion, minimizing heterogeneity and decreasing feed wastage
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