A lot of times the wind and current pushes it diagonal with the surface so you can't see it. You will see it however if you have a fish finder or drop your sabiki down deep and get snagged whenever you drift 5 feet.
Kelp grows fast, so it breaks off fast too. Maybe a lot of it broke off and drifted away, and the wind pushed it down.
The only other thing I could think of it the kelp harvester boats just cleaned the area out.
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