I'm surprised there were any entries there. You may hear them on the HF marine channels, but I wouldn't be a bit surprised if they went out of band. Foreign fishing fleets are famous for this. Often they use illegally modified ham gear, which won't last anyway in a salt air environment. I've heard this myself, many times.
Of course, how accurate these listings are is quite another matter.
Here is the official USCG listing of the HF marine frequencies
73 Mike
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