Sunflower meal with and without phytase supplementation in diets for silver catfish (Rhamdia quelen) juveniles

Kátia A Weiler, Jhonis E Pessini, Milena S S Sanchez, Mariana L Rodrigues, Wilson R Boscolo, Luiz E Pezzato, Fábio Bittencourt, Altevir Signor


Background: The cost of feed in fish farming can exceed 70% of the total costs. Thus, the feed industry have sought to formulate balanced diets including low-cost by-products. Objective: To evaluate sunflower meal as a partial substitute (0, 10, and 20%) for soybean meal, with or without phytase supplementation (1,500 FTU/kg) in isoproteic (27% crude protein (CP)) and isoenergetic diets (3,400 kcal/ED/kg of feed) for silver catfish (Rhamdia quelen) juveniles. Methods: A total of 360 fish (weight: 15.77 ± 0.56 g) were randomly distributed in 24 tanks in a completely randomized design following a factorial scheme (3x2) with 4 replicates. The fish were evaluated on the following variables after 90 days: productive performance, hematological variables, histology of intestinal tissue, bromatological composition of carcass, and composition of bone mineral matter. Results:  20% dietary inclusion of sunflower meal improved weight gain and protein efficiency. No difference was observed in the other treatments and no interactions were observed between the other factors. Conclusion: 20% sunflower meal can be included in the feed of silver catfish as a substitute for soybean meal. Phytase inclusion (1,500 FTU/kg) did not improve the nutritional value of the treatments.


aquaculture; aquiculture; alternative feed; diet supplementation; enzyme; fish nutrition; phytase; productive performance; Rhamdia quelen; silver catfish; sunflower meal

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DOI: Abstract : 163 PDF : 184

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