DO CANADIANS NEED AN I-68 TO FISH IN US. WATER?

I have heard different stories about needing an I-68 to fish in USA water. I am Canadian and have an American licence. I fish the Detroit River. Some guys have been stopped by the Coast Guard and told that they can lose their boats if they don't have the I-68. Anybody know for sure.
Also, I saw the US Coast Guard heading down river at about 6.15 this morning. Did antbody run into these guys today and did they check any Canadians? Thanks for the information

[Erie Drifter]

The way I understand it, you only need one to go on shore for over 72 hours.

http://www.ins.usdoj.gov/graphics/fo...forms/i-68.htm

Bill W. (War-N-Peace-ch 68)

All you need is a fishing licence for US waters.That form is only if you step on US soil.....Coast Guard could care a less how many fish you keep.There just a bit busy with nuts that want to blow stuff up.