Publication: Effects of Micro- and Macroalgae-Supplemented diets on Growth and Muscle Fibrillar Constitution of Gilthead Seabream, Sparus aurata L., in the Final on-growing Phase
Authors
Ayala Florenciano, María Dolores ; Chaves Pozo, Elena ; Sáez, María Isabel ; Alarcón, Francisco Javier ; Martínez, Tomás Francisco ; Arizcun, Marta
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Publisher
MDPI
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Description
© 2025 by the authors. This manuscript version is made available under the CC-BY 4.0 license http://creativecommons.org/licenses/by/4.0/ This document is the Published Manuscript version of a Published Work that appeared in final form in Fishes. To access the final edited and published work see https://doi.org/10.3390/fishes10060262
Abstract
The influence of algae in a final fattening diet for gilthead seabream, Sparus aurata, was studied in an 87 d feeding trial. Five groups were analysed (three tanks per group).
In the first 38 days, one lot was fed with standard algae-free feed (C1) and four batches
were fed with an algae-free diet low in fishmeal (FM) and fish oil (FO) and rich in terrestrial
vegetables (C2). Subsequently, the C2 diet was changed in three out of the four groups,
two of them being fed a diet with a microalgae blend (10%) plus 2% macroalgae (Alaria
esculenta), either in raw (C2-R) or hydrolysed (C2-H) form, and a third batch with a diet
lacking FM and FO but supplemented with 10% microalgae and 7% algae oil (C2-O) for
49 days. Body length and weight, muscle parameters, and conversion index were analysed
after 38 and 87 days. At day 38, no significant differences were observed in any parameter
between C1 and C2, but at the end of the trial (day 87), C2 displayed the lowest weight
gain and the worst conversion rate, whereas C2-R showed higher body weight, fibrillar
hypertrophy, and better conversion rates than the other groups, and C2-H displayed higher
hyperplasia values than the other groups.
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