I lived in San Diego for 45 years and associated with a lot of lobster fisherman.  When regulations were put in place and size and amount, as well as lottery for a limited amount of fishing licenses to collect they were up in arms, saying that "this is how they have fed their families for generations."
But, After a few years the lobsters they caught were in great numbers, and were larger than before.  They also discovered new things to do in the off season, like whale watching and fishing of different kinds, and scuba trips.
The problem is the fisherman cannot regulate themselves. They cannot resist the greed, and those virgin fishing waters.