Hello,
My impression of the roll period and pitch in such a sea is that the rendering is quite correct, so I agree with groennegaard, the movements are realistic enough.
But I can understand that it doesnt fully seem to be realistically rendered for everyone. The trawler still rides "high" on the waves (no fish?, no ice?, no gasoil?) and one sees that there is no wind to push the crests of the waves, giving some eerie aspect to a rather short sea.
Regards,
Luc