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Vitamin D content in Alaskan Arctic zooplankton, fishes, and marine mammals. David E. Kenny 1, Todd M. O'Hara, Tai C. Chen, Zhiren Lu, Xiao Tian, Michael F. Holick. Zoo Biology Volume 23 Issue 1, Pages 33 - 43 Published Online: 13 Feb 2004 Doi: 10.1002/zoo.10104

Food chain as origin of vitamin D in fish D. Sunita Rao and N. Raghuramulu. Comparative Biochemistry and Physiology Part A: Physiology Volume 114, Issue 1, May 1996, Pages 15-19 doi:10.1016/0300-9629(95)02024-1 Plankton, the chief food source of fish, was assessed as the possible dietary origin of vitamin D in fish. The presence of vitamin D compounds were examined in fresh water phytoplankton and zooplankton employing a series of chromatographic procedures. Abundant amounts of provitamins D and vitamins D (D2 and D3) were found in the fresh water plankton. The high amount of vitamin D observed may be due to exposure of plankton to sunlight because the plankton were caught during the summer month. Thus, plankton may be an important contributor to vitamin D in fish.

Evolution and function of vitamin D. Holick MF. Recent Results Cancer Res. 2003;164:3-28. Review. PMID: 12899511