My back yard is the Gulf of Mexico whose fisheries are in the midst of a re-birth. We are seeing new abundance in the stocks of red snapper, several species of grouper (red, gag, black, scamp, goliath, etc.). Pompano, king mackeral and billfish are more plentiful now than they were back in the 70's.
This is the opposite of decline.
The alarmists have an agenda and if you've been here on FR a while, you will recognize their pattern.
You're correct about the alarmist hand wringing by the untenured con-men. These boys and girls are just fishing for taxpayer grants.
I'm not a sea fisherman, preferring instead to fish inland where the things living in the water don't eat you in one bite, but I do have a basic understanding of supply and demand.
We constantly hear how the salmon are in trouble, and something must be done. If the ocean salmon are in trouble, why am I buying "wild" salmon for 98¢ a pound at the market? When asked this question, the eco-conmen just turn and walk away without replying.