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• W3204162099 abstract "Abstract Vitamin B 12 (B 12 ) is an essential micronutrient for all animals, but is not present in plants and is produced de novo only by bacteria or archaea. Accordingly, humans must derive required B 12 from eating animal products or vitamin supplements, as deficiencies can lead to severe health issues including neuropathy. An often overlooked source in the human diet of B 12 is shellfish, in particular bivalves, which have significantly higher levels of B 12 than other animal sources, including all vertebrate meats. Origins and key metabolic processes involving B 12 in bivalves remain largely unknown, despite the exceptionally high levels. In this study, we examined in several Australian bivalve species, hypotheses concerning B 12 utilisation and uptake through diet or microorganism symbiosis. Vitamin B 12 is not distributed evenly across different tissues types of the Pacific oyster, the commercial scallop and Goolwa cockle (pipi), with higher accumulation in the oyster adductor muscle and gill, and mantle and syphons of the Goolwa cockle. Oyster larvae before first feeding already contained high amount of B 12 ; however, a significant decrease in B 12 concentration post metamorphosis indicates a higher utilisation of B 12 during this life event. We demonstrated that microalgal feed can be supplemented with B 12 , resulting in an enriched feed, but this did not result in an increase in larval B 12 concentrations when oyster larvae were fed with this diet relative to controls, thus supporting the theory that a B 12 producing microbiome within bivalves was the potential source of B 12 rather than feed. However, B 12 concentrations in the digestive tract of adult oysters were low compared to other tissue types, which might challenge this theory, at least in adults. Our findings provide insight into B 12 uptake and function in bivalve species, which will aid the promotion of bivalves as suitable B 12 source for humans as well as provide crucial information to the aquaculture industry in relation to optimisation of vitamin supplementation in bivalve hatchery production." @default.
• W3204162099 created "2021-10-11" @default.
• W3204162099 creator A5009297966 @default.
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• W3204162099 date "2021-10-08" @default.
• W3204162099 modified "2023-10-16" @default.
• W3204162099 title "Investigation of vitamin B12 concentrations and tissue distributions in larval and adult Pacific oysters and related bivalves" @default.
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• W3204162099 doi "https://doi.org/10.1101/2021.10.08.463682" @default.
• W3204162099 hasPublicationYear "2021" @default.
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