1. From http://www.whfoods.com/genpage.php?tname=foodspice&dbid=104
According to nutrient databases, one 3.5-oz (100-gram) serving of salmon contains between 361 and 685 IU of vitamin D (5).
However, it is usually not specified whether the salmon was wild or farmed. This might not seem important, but it can make a big difference.
One study found that wild-caught salmon contains 988 IU of vitamin D per 3.5-oz (100-gram) serving, on average. That's 247% of the Reference Daily Intake (RDI) (6).
Some studies have found even higher levels in wild salmon, ranging up to 1,300 IU per serving (7).
Farmed salmon contained only 25% of that amount, on average. Still, that means a serving of farmed salmon contains about 250 IU of vitamin D, which is 63% of the RDI (6).