Provitamin D&lt;sub&gt;3&lt;/sub&gt; Contents in Fish Meat

Okazaki, Emiko; Katayama, S.; Shibata, Nobukazu

doi:10.2331/suisan.56.1695

Cited by 1 publication

(1 citation statement)

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“…1987; Rao & Raghuramulu 1995). Younger (smaller) fish appear to have higher concentrations of 7‐DHC (still 1/10 of the values in humans) than older (bigger) fish (Okazaki et al 1990), but this relation with age and vitamin D 3 does not exist (Mattila et al . 1997).…”

Section: Origin and Hydroxylation Of Vitamin D Metabolitesmentioning

confidence: 99%

The significance of vitamin D for fish: a review

Lock

Waagbø²,

Bonga

et al. 2010

Aquaculture Nutrition

132

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Fish store large quantities of vitamin D in their liver and fat tissues, including the fat associated with muscle, and this makes fish an important dietary source of vitamin D. Fish do not synthesize vitamin D and are fully dependent on dietary sources to meet their requirement. Under natural circumstances planktonic vitamin D accumulates in the aquatic food chain. In aquaculture, formulated diets are used and vitamin D intake can be manipulated. The minimum dietary requirement for vitamin D has been established in several fish species. The role of vitamin D in fish physiology is still enigmatic. Till the 1970s there was consensus that fish accumulate but not metabolize vitamin D. There is substantial evidence now, four decades later, that fish have a vitamin D endocrine system with similar functions as in mammals. We here summarize the major characteristics of the fish vitamin D endocrine system. The hydroxylation of vitamin D to more polar metabolites, their plasma levels and protein-bound transport in blood plasma will be discussed. The vitamin D receptor profile, receptor distribution and responses to vitamin D are reviewed for the key target tissues (gill, intestine, kidney and bone). We will address the classical slower actions through transcription factors as well as the faster G-protein coupled (membrane) receptor mediated effects. We then review the dietary requirement of vitamin D in aquaculture and address some lesser known functions of the vitamin D endocrine system. KEY WORDS

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Section: Origin and Hydroxylation Of Vitamin D Metabolitesmentioning

confidence: 99%