Calcium, Sardines, Water, and Oil

[Guest guest]

I was browsing through the cans of sardines at WalMart last night,

and I was noticing that the sardines in spring water with skin and

bones intact had 30% of daily calcium. I thought this was an

excellent source of calcium and EFA for the price and calories. Then

I looked at the same product in oil and it had 70% of the daily

calcium. The brand, net weight, and source of sardines are the same

(Great Value - from Morocco). Is this probably a labelling error, or

is this a phenomenon of calcium/oil/water that has escaped me to date?

Thanks for any pointers anyone might have.

Katrina.