RT journal article
T1 Effect of algal extracts on the metabolism, intestinal functionality and oxidative status of gilthead of seabream (Sparus aurata)
A1 Martínez Antequera, Francisca Purificación
A1 Simo Mirabet, Paula
A1 Román, M.
A1 Fuentes, J.
A1 Oliva Ramírez, Milagrosa
A1 Méndez-Paz, D.
A1 Vázquez-Sobrado, R.
A1 Martos Sitcha, Juan Antonio
A1 Moyano, F.J.
A1 Mancera Romero, Juan Miguel
A2 Biología
K1 Aquafeeds
K1 Algal extracts
K1 Bioactive compounds
K1 Antioxidant activity
AB Intensive aquaculture systems are associated with decrease in water quality and increased environmental stress and disease prevalence. This promotes the exploration of bioactive compounds that can be included in aquafeeds to enhance fish resilience under such negative conditions. The present study investigated the effects of dietary supplementation with two different extracts obtained from the green seaweed Ulva spp. on the growth performance, intestinal functionality, metabolic profile and oxidative status of gilthead sea bream (Sparus aurata). These extracts, either characterized to be enriched in protein (P) or carbohydrate (F) fractions, were included at 12 % in respective diets. After a 42-day feeding trial, a 10-day starvation challenge was conducted as a putative proof-of-concept on the effects of bioactive compounds under food-deprivation. No significant differences in growth performance were observed between the experimental groups during the feeding period. However, after starvation challenge, fish fed the Ulva-based diets exhibited reduced weight loss (∼5 % lower than the control group), indicating enhanced physiological resilience. No significant effect of the inclusion of algal extracts was observed on intestinal morphology or functionality. Biochemical analyses revealed that plasma lactate levels were significantly lower (∼15 %) in the P group, while plasma protein concentrations were reduced (∼9 %) in the F group compared to the control. Hepatic glycogen depletion was more pronounced in fish fed both supplemented-experimental diets after the starving period. Conversely, oxidative stress markers indicated enhanced antioxidant capacity in both experimental groups. Superoxide dismutase (SOD) activity was significantly higher (∼13 %), while malondialdehyde (MDA) levels, a marker of lipid peroxidation, were ∼ 15 % lower in Ulva-fed fish compared to controls. These findings suggest that Ulva spp. extracts may confer metabolic and antioxidant benefits, particularly under starvation-induced stress, without compromising growth performance. Further research is warranted to optimize inclusion rates and elucidate their long-term impacts.
PB Elsevier
SN 0044-8486
YR 2025
FD 2025
LK http://hdl.handle.net/10498/38141
UL http://hdl.handle.net/10498/38141
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 15-nov-2026