You'd be surprised how much dolphin and shark used to get sold as "swordfish steaks" when stocks of the trendy fish of the 90's were getting depleted and the prices were going through the roof. Knowing commercial fishermen isn't always a good thing. That was the end of swordfish for me.
When Anthony Bourdain went to Chile on his original TV show, he went out on the boats. There he revealed that then trendy "Chilean Sea Bass" was a big, ugly, trash fish the locals referred to as "snotfish". Sales of "Chilean Sea Bass" went in the dumper.
Tony seems to have a personal crusade to ban the bland things from American restaurants. He's always ranting about them. He probably has nightmares about tilapia.