RT info:eu-repo/semantics/article
T1 Effect of feed supplementation with seaweed wracks on performance, muscle lipid composition, antioxidant status, digestive enzyme activities, and plasma biochemistry of gilthead seabream (Sparus aurata) juveniles
A1 Galindo, Ana
A1 P´erez, Jos´e A.
A1 Martín, Virginia
A1 Acosta, Nieves G.
A1 Reis, Diana B.
A1 Jim´enez Díaz, Ignacio Antonio
A1 Rosa, Gonçalo
A1 Venuleo, Marianna
A1 Marrero, Manuel
A1 Rodríguez, Covadonga
K1 Antioxidant capacity
K1 Beach-cast macroalgae
K1 Blood parameters
K1 Digestive enzymes
K1 Fatty acid profile
AB Macroalgal wracks are frequently considered as waste products. However, macroalgae are a rich source of protein andbioactive compounds with antioxidant and antimicrobial activities whose inclusion in aquafeeds is receiving growingattention. The aim of this study was to assess the use of beach-cast macroalgae as dietary supplement for gilthead seabream(Sparus aurata) juveniles. Fish were fed for 93 days with an extruded commercial diet (CD); a CD supplemented with 7% ofa dried-powder from a multispecific macroalgal wrack (30.9% Lobophora sp., 21.9% Dictyota sp., 19.6% Asparagopsistaxiformis, 17.5% Cymopolia sp., 1.8% Hypnea sp., 0.2% Laurencia sp., 0.1% Stypocaulon sp., and 8% not determined)(CD+MU7); a CD supplemented with a monospecific macroalgal wrack of 85% Lobophora sp. (CD+MOL7); and a CDsupplemented with a monospecific macroalgal wrack of 85% Dictyota sp. (CD+MOD7). Macroalgae were extracted with nhexanes,ethyl acetate and ethanol, and the antioxidant capacity of extracts was assessed, with ethyl acetate leading to themost active extracts (p < 0.05). The dietary inclusions of a 7% macroalgal wrack did not negatively affect S. auratasurvival, growth, body indexes, proximate composition, oxidative status and plasma parameters. Contrarily, fish fed onCD+MU7 and CD+MOD7 showed the highest monoacylglycerols content, while both monospecific diets led to the highesttotal saturated fatty acids content in muscle (p < 0.05). The digestive enzymes profile was slightly modified (p < 0.05), butwithout compromising fish performance. Finally, muscle from fish fed on CD+MOL7 seemed to display a better capacity tomodulate the glutathione metabolism (p < 0.05). In conclusion, a 7% of macroalgal wracks can be used as a dietarysupplement for S. aurata juveniles, depicting an attractive alternative for the effective harnessing of this usually discardedbiomass. Macroalgal inclusion may also reduce the use of fish-based ingredients for aquafeeds, diminishing the pressure onpelagic fisheries, and contributing to the blue bioeconomy strategy.
YR 2023
FD 2023
LK http://riull.ull.es/xmlui/handle/915/35873
UL http://riull.ull.es/xmlui/handle/915/35873
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 11-may-2024