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Linseed fibers modulate the production of short-chain fatty acids and improve performance and plasma and skin mucus parameters of silver catfish (Rhamdia quelen)

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Abstract

This study was conducted to evaluate the prebiotic action of distinct linseed fibers on diets for silver catfish (Rhamdia quelen) juvenile. For this, soluble and insoluble fractions of linseed fiber were concentrated separately and combined in four ratios (1:0.5, 1:1, 1:2, 1:4), which were added in diets and evaluated along with a control diet. After 45 days receiving the experimental diets, the animals were submitted to biometry for data collection and samples. The experimental design was completely randomized, data were submitted to analysis of variance, and the means were compared by Tukey’s test (P < 0.05). Fish performance was higher for the group that received the 1:2 and 1:4 diets. The production of intestinal acetic acid was higher in fish fed on the 1:2 diet, and butyric acid was higher with 1:4 diet and the propionic acid with the control diet. The control diet led to lower counts of goblet cells. Total proteins and globulins in plasma, mucoprotein, total immunoglobulins, and cutaneous mucus pH were higher in fish fed on diets 1:2 and 1:4. Cortisol levels and intestinal pH were lower in these treatments. The linseed fiber intake increased total plasma immunoglobulins and plasma alkaline phosphatase activity and in mucus. It was concluded that the use of 1:2 and 1:4 soluble fiber/insoluble linseed in the diet beneficially modulates the production of short-chain fatty acids in the digesta, with reflection on growth performance, number of goblet cells in the intestinal epithelium, and improvement in plasma and skin mucus parameters of fish.

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Data availability

The dataset generated during and/or analyzed during the current study are available in https://doi.org/10.17632/3yyfhw6fhn.1.

Abbreviations

BHT:

Butylhydroxytoluene

DWG:

Daily weight gain

IgT:

Total immunoglobulin

SE:

Standard error

SCFA:

Short-chain fatty acids

S:IF:

Soluble/insoluble fiber

UFSM:

Federal University of Santa Maria

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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 Higher Education Personnel Improvement Coordination (CAPES) by the Postdoctoral Research Grant/PNPD (Taida Juliana Adorian).

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Correspondence to Taida Juliana Adorian.

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Adorian, T.J., Mombach, P.I., Fagundes, M.B. et al. Linseed fibers modulate the production of short-chain fatty acids and improve performance and plasma and skin mucus parameters of silver catfish (Rhamdia quelen). Fish Physiol Biochem 46, 2355–2366 (2020). https://doi.org/10.1007/s10695-020-00885-7

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  • DOI: https://doi.org/10.1007/s10695-020-00885-7

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