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ESTM - Mestrado em Aquacultura

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http://hdl.handle.net/10400.8/5484

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Browsing ESTM - Mestrado em Aquacultura by Author "Andrade, Flávio André Monteiro"

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  • Nutritional tools to enhance the resilience to stress and diseases of the whiteleg shrimp Penaeus vannamei
    Publication . Andrade, Flávio André Monteiro; Baptista, Teresa Maria Coelho; Barreto, André Barreto
    The Pacific white shrimp (Penaeus vannamei) is currently one of the most widely farmed aquaculture species. Industry faces challenges related to diseases and environmental fluctuations, which compromise productivity and sustainability. Since shrimp cannot be vaccinated, due to the lack of acquired immunity, and the use of antibiotics in aquaculture is increasingly restricted, immunomodulation through nutrition emerges as a viable alternative. This study evaluated the potential of supplementing diets with extracts derived from Salicornia ramosissima for juvenile P. vannamei, testing their ability to enhance resilience to extreme farming conditions, such as acute and chronic stress induced by air exposure. Five diets were formulated: one control and four supplemented with 0.1% and 0.5% inclusions of XAD and Ext3 extracts. Shrimps were fed the experimental diets for 29 days under normal and chronic stress conditions, followed by an acute stress challenge in the groups reared under normal conditions. Zootechnical parameters, survival after acute stress, and immunological and antioxidant biomarkers were analysed. Results showed that, in general, the extracts did not compromise growth or survival, except for the Ext3 at 0.1% treatment, which exhibited higher FCR. The stress methodologies effectively induced physiological responses, with differences in biomarkers between control and stressed groups. Although no clear effects were observed under chronic stress, some indications of a protective effect of the extracts were noted under acute stress, but these were not confirmed by mortality data. In conclusion, supplementation with S. ramosissima extracts did not impair shrimp performance and revealed promising trends that justify further investigation.
    2025-11-14Master thesis Embargoed access Show more