Posted by John on Thursday, August 27, 2009 at 9:47pm.
I don't believe kelp is a countable noun, so your first and second sentences are correct.
Your third and fourth sentences are not correct, though. You'd simply say, "I ate kelp," or "I ate some kelp."
Here's a bit more information. Notice how the word is used in here:
http://en.wikipedia.org/wiki/Kelp
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