Functional Feeds to Tackle Meagre (Argyrosomus regius) Stress: Physiological Responses under Acute Stressful Handling Conditions

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Monteiro, M (Author) Other; Sousa, C (Author) Other; Coutinho, F (Author) Other; Castro, C (Author) Other; Fontinha, F (Author) Other; Guerreiro, I (Author) Other; Pousao, P (Author) Other; Matos, E (Author) Other; Diaz Rosales, P (Author) Other; Oliva Teles, A (Author) FCUP; Enes, P (Author) FCUP; Ana Couto (Author) FCUP

Journal

Title: Marine Drugs

Vol. 52

Final page: 598

ISSN: 1660-3397

Publisher: MDPI

Indexing

ISI Web of Knowledge - 15 Citations

Scopus - 15 Citations

Other information

Authenticus ID: P-00V-MA3

DOI: 10.3390/md19110598

Abstract (EN): Marine algae are recognised sources of bioactive compounds that have attracted great interest as nutritional supplements for aquaculture fish. Intensive rearing conditions often expose fish to husbandry-related stressors, rendering fish more susceptible to disease and reducing production yields. The present work evaluated the potential of two marine algae extracts (Fucus vesiculosus and Nannochloropsis gaditana) as nutritional supplements to mitigate stress effects in meagre (Argyrosomus regius) exposed to an acute handling stress (AS). A plant-based diet was used as a control, and three other diets were prepared, which were similar to the control diet but supplemented with 1% of each algal extract or a combination of the two extracts (0.5% each). The effects of supplemented diets on stress biomarkers, antioxidant enzyme activities, and immune response were analysed in fish exposed to AS after 4 weeks of feeding. Supplemented diets did not affect growth performance but the inclusion of F. vesiculosus promoted higher feed efficiency, as compared to the control group. Dietary algal extracts supplementation reduced plasma glucose levels, increased white blood cell counts, and reduced the expression of pro-inflammatory genes when compared with the control. N. gaditana supplementation led to a reduction in hepatic antioxidant enzyme activity and glutathione levels, while F. vesiculosus supplementation increased muscle glutathione reductase activity and reduced lipid peroxidation. These findings support the potential of algal extracts as nutraceuticals in aquafeeds to enhance the ability of fish to cope with husbandry-related stressful conditions and ultimately improve fish health and welfare.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 19