Fish do not synthesize vitamin D, yet it is an important dietary source of vitamin D:

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; plankton – the chief food source of fish, was assessed as the possible dietary origin of vitamin D in fish.

Plankton are the diverse collection of organisms found in water that are unable to propel themselves against a current. The individual organisms constituting plankton are called plankters. In the ocean, they provide a crucial source of food to many small and large aquatic organisms, such as bivalves, fish and whales.

In a study, abundant amounts of provitamins D and vitamins D (D2 and D3) were found in the fresh water plankton. Researchers claim, the high amount of vitamin D observed was perhaps 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.

(Source of Information:, Wikipedia &

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