Nice looking boat. From the 1960’s? That is a “beam trawler”. So-called because the net is held open by an integral beam, rather than by trawl doors. They tow two small nets at once.
I have never seen a beam trawler in the US because this fishing method fell out of favor after WWII when more powerful engines and larger nets spread by trawl doors proved to be more efficient.
There are certain US fisheries, in certain places, at certain times, where trawling with trawl doors is prohibited, but theoretically, beam trawling is still allowed.
I’m not sure why beam trawling continues in Europe today. Obviously, there must be good reasons.
There are other European fishing methods, such as “Scottish seining” that have been tried in the US, but have never become established.