4.5 Article

Dietary nucleotides enhance growth performance, feed efficiency and intestinal functional topography in European Seabass (Dicentrarchus labrax)

Journal

AQUACULTURE RESEARCH
Volume 50, Issue 7, Pages 1921-1930

Publisher

WILEY
DOI: 10.1111/are.14078

Keywords

aquaculture; intestine; microvilli; morphology; nucleosides; nucleotides

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Nucleotides, nucleosides and nucleic acids (NU) have many critical functions in supporting life and increasing evidence suggests that exogenous supply can benefit the health of mammals and fish. For these reasons, a 6-week feeding trial was conducted on juvenile European seabass (Dicentrarchus labrax) with diets containing 0%, 0.15% and 0.3% inclusion of a NU mixture (Laltide (R)) derived from the yeast Saccharomyces cerevisiae. At the end of the study no significant differences were found in fish performance, although a tendency towards better performance was indicated in fish fed the Nu0.3 diet. In relation to histological assessment, a significantly greater perimeter ratio; internal to outer (IP/OP) was observed in the posterior intestine of fish fed supplemental NU. Microvilli heights in the posterior intestine were also shown to be significantly promoted in fish fed NU diets (p < 0.05). Goblet cell abundance was shown to be unaffected by the inclusion of NU in the diet (p > 0.05). Overall, this study indicates that orally administered NU may be effective promoters of gut functional topography with marginal associated improvements to fish performance. Nonetheless, longer exposure and/or commercial scale application, and in diets that were challenging in use of high inclusion levels of plant by-products would potentially amplify improvements in production characteristics, in turn benefiting fish culturists.

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