Rice ethanol distillery residue as a protein source in the diet of silver catfish (Rhamdia quelen)

ABSTRACT

The objective of the study was to evaluate the partial replacement of the protein of fish meal by the protein from the intermediate residue of rice ethanol distilleries in the proportions of 0%, 25%, and 50% in Rhamdia quelen. Three hundred and seventy-five fish (3.56 ± 0.6 g/7.07 ± 0.46 cm) were distributed in 15 tanks and fed three times a day for 60 days. At the end of the period, biometrics were performed to collect data and tissues, evaluating growth parameters, sonatic indices, digestive enzyme activity, plasma and hepatic metabolism, body nutrient composition, protein, and fat deposition. Fish fed the control diet showed higher feed intake (765.86 ± 53.86 g). The 50% replacement diet reduced final growth (14.27 ± 3.88 g), deposition of body protein (1.63 ± 0.05 g) and increased free liver amino acids (8.72 ± 0.41). The use of intermediate residue from rice ethanol distilleries in silver catfish diets was inefficient, requiring further studies to evaluate the protein quality of this ingredient.

KEYWORDS:

• Rice biorefinery
• fish nutrition
• protein

Acknowledgments

The authors would like to thank the Rio Grande do Sul State Research Support Foundation (FAPERGS) for supporting the project (protocol 41822.540.15414.11072019), the National Council for Scientific and Technological Development (CNPq) for granting a research grant (Leila Picolli da Silva), and the Coordination for the Improvement of Higher Education Personnel (CAPES) for the Postdoctoral Research Grant/PNPD (Taida Juliana Adorian).

Disclosure statement

The authors declare that there is no conflict of interest related to this manuscript.

Data availability statement

The dataset generated and/or analyzed during the current study are available in http://dx.doi.org/10.17632/rxyg5w2t5f.1.

Additional information

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.