This is a special warning post to protect my dear readers from harm by fish. I write this because we have increasingly encountered this particular fish on restaurant menus, a fish that should not be there. Eat it at your peril. We did, and now we know better.
The fish is called Escolar or Snake Mackerel, but more often is listed on menus as Super-White Tuna, Walu, Butterfish, and even as Sea Bass and Black Cod and a number of other fish that it isn't. This is a misrepresentation. It's hard to say if this is the fault of the fish wholesaler or the restaurant, but it's dishonest. The best thing to do is to ask the waiter if it's the same thing as Escolar and hope that you get the correct answer...or order something else. If you order the fish, it will be very rich and delicious, and you would be unlikely to attribute the alarming after effects to this tasty fish. That said, there have been lawsuits against restaurants. It is currently illegal to sell the fish in Japan and Italy. Some countries allow it to be sold, but only with a warning. It was also prohibited in the United States until the 1990s, but now it's legal to sell and becoming more common.
Wikipedia and the Medellitin Food Blog . I would also mention that it is probably (?) safe to eat the fish in a tiny portion such as on a sushi roll. Many sources claim that if you keep the serving under six ounces you should be fine. I can tell you from experience, (we split an 8-oz portion) that that's not true. There are also claims that only 1 in 3 people have problems with it. I don't buy that either.
Here is the back of the last card, associating good health with the fish. Believe it if you will.