Elemental composition and bioaccessibility of farmed oysters (Crassostrea gigas) fed different ratios of dietary seaweed and microalgae during broodstock conditioning

• Published in: Food Science & Nutrition
• Main Authors: Cardoso, Carlos, Gomes, Romina, Rato, Ana, Joaquim, Sandra, Machado, Jorge, Gonçalves, José Fernando, Vaz‐Pires, Paulo, Magnoni, Leonardo, Matias, Domicilia, Coelho, Inês, Delgado, Inês, Castanheira, Isabel, Matos, Joana, Ozório, Rodrigo, Bandarra, Narcisa, Afonso, Cláudia
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley Open Access 2020
• Subjects: Bioaccessibility; Dietary Effects; Elemental Composition; Microalgae; Pacific Oyster; Seaweed; Composição dos Alimentos; Pacific; Crassostrea gigas; Pacific oyster
• Online Access: http://hdl.handle.net/10400.18/6491; https://doi.org/10.1002/fsn3.1044

Free PMC article: https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31428337/ [Correction added on 8 July 2019, after first online publication: New affiliation was added for Jorge Machado, José Fernando Gonçalves, and Paulo Vaz‐Pires.] The Pacific oyster (Crassostrea gigas) culture has been expanding, thereby leading to a greater importance of hatcheries. Broodstock conditioning is very important in the hatchery process, in which diet composition may have a strong influence on the offspring production and quality. Therefore, the current study evaluated elemental composition and bioaccessibility of oysters fed different ratios of dietary seaweed (SW) and microalgae. The dietary conditioning consisted of direct replacement of microalgae by SW at four substitution levels (0%, 25%, 50%, and 100% diet). It was observed that oysters fed 100% SW had the highest levels of Be, Cu, Zn, Sr, and Cd. The most important trend was a concentration decline of most elements with progressively lower levels of SW substitution for microalgae in the feeds. No Cd or Pb hazard (contents below 1.0 mg/kg for Cd and 1.5 mg/kg for Pb) was found in oyster meat. Regarding elemental bioaccessibility, values were similar, near 100% in the cases of Cu, Br, and I. Only for Mn and Pb, bioaccessibility percentages deviated more from 100%. Indeed, the value for Pb was 50% ± 7% (initial group), and for Mn, all values were equal or lower than 29% ± 2% (final group of oysters fed microalgae). It was observed that Mn, Cd, and Pb bioaccessibility increased with a growing share of microalgal biomass in the feed. Therefore, this study showed that SW incorporation into the feed influences elemental composition and bioaccessibility of the oysters. The current study was supported by Project INNOVMAR— Innovation and Sustainability in the Management and Exploitation of Marine Resources (NORTE‐01‐0145‐FEDER‐000035) within the line “INSEAFOOD, Innovation and valorization of seafood products,” funded by the Northern Regional Operational Programme (NORTE2020) through the European Regional Development Fund (ERDF). Moreover, the study was funded by the project AQUAMAX (Ref. 16‐02‐01‐FMP‐0047). This work was also supported by the following Postdoctoral Grants: Ref.: SFRH/BPD/102689/2014 (“Fundação para a Ciência e a Tecnologia,” FCT) for the author Carlos Cardoso, Ref.: SFRH/BD/129795/2017 (“Fundação para a Ciência e a Tecnologia,” FCT) for the author Joana Matos, and DIVERSIAQUA (MAR2020) for the author Cláudia Afonso. info:eu-repo/semantics/publishedVersion