resumo
The nutritional value and developmental variations of cultured fish were assessed for European seabass and gilthead seabream specimens reared in semi-intensive aquaculture systems in two Portuguese estuaries. Quantification of total protein and of carbohydrate and fatty acid profiles was carried out to determine differences between the composition of the same species in two development stages reared in four distinct farms. A significant influence of the rearing site on the nutritional composition of the same species was found for adult European seabass regarding saturated, monounsaturated and highly unsaturated fatty acids contents, both between estuaries and within each estuary. In gilthead seabream, saturated, monounsaturated, polyunsaturated and highly unsaturated fatty acids content were also influenced by the rearing site. Carbohydrate analysis showed a significant influence of the rearing site on free sugar and polysaccharide content in fish of both species, and there was no influence on the species' protein content. Differences in fatty acid and carbohydrate content among juvenile and adult stages were found for all the groups studied. The present study supported the existing evidence that semi-intensive rearing systems are subjected to the variability of extrinsic factors in the rearing sites, influencing the nutritional value of the same species, namely regarding lipid and carbohydrate profiles, depending on the production site. From a consumer's perspective, such differences may come as a disadvantage of the rearing method, as it is expected for a product to provide equal nutritional properties and benefits regardless its origin, especially within the same country.
palavras-chave
FATTY-ACID COMPOSITIONS; BREAM SPARUS-AURATA; DICENTRARCHUS-LABRAX L.; CORONARY-HEART-DISEASE; FISH-MEAL REPLACEMENT; QUALITY CHARACTERISTICS; PROTEIN-UTILIZATION; MONDEGO ESTUARY; AMINO-ACID; WILD
categoria
Environmental Sciences & Ecology
autores
Rocha, CP; Cabral, HN; Nunes, C; Coimbra, MA; Goncalves, FJM; Marques, JC; Goncalves, AMM
nossos autores
Cláudia Nunes
Investigador Auxiliaragradecimentos
This study was supported by Fundacao para a Ciencia e a Tecnologia (FCT) through the strategic projects UID/MAR/04292/2013 granted to Marine and Environmental Sciences Centre (MARE) and UID/AMB/50017/2013 granted to Centro de Estudos do Ambiente e do Mar (CESAM) and QOPNA (UID/QUI/00062/2013). A. M. M. Goncalves and C. Nunes thank FCT for the financial support provided through the post-doctoral grants SFRH/BPD/97210/2013 and SFRH/BPD/100627/2014, respectively, co-funded by the Human Potential Operational Programme (National Strategic Reference Framework 2007-2013), European Social Fund (EU), and the program POPH/FSE. A. M. M. Goncalves also acknowledges University of Coimbra for the contract IT057-18-7253. This research was partially supported by PORBIOTA, E-Infrastructure Portuguese Information and Research in Biodiversity (POCI-01-0145-FEDER-022127), supported by Competitiveness and Internationalization Operational Programme and Regional Operational Programme of Lisbon, through FEDER, and by the Portuguese Foundation for Science and Technology (FCT), through national funds (OE) and partially supported by the Regional Operational Programme CENTRO2020 within the scope of the project CENTRO-01-0145-FEDER-000006. The authors also thank the support given by the aquacultures involved in this study.