When I was doing location catering years back, a fellow caterer sent 30 or so people from the crew to the hospital after serving escolar.
They were dropping like flies. I won't touch it.
Escolar's wax ester content can cause keriorrhea (Greek: flow of wax), gempylotoxism or gempylid fish poisoning . Keriorrhea is similar to diarrhea, only the body will expel yellowish-orange drops of oil instead of liquid bowel movements. Some individuals suffering from escolar-induced keriorrhea also report other digestive issues, including stomach cramps, diarrhea, headaches, nausea, vomiting, and anal leakage; onset may occur between 30 minutes and 36 hours following consumption. This condition may also be referred to as steatorrhea.
Two known ways to reduce the likelihood of escolar-induced keriorrhea are to limit portions to six ounces or less and to consume portions close to the tail, which typically have a lower wax ester content. Reports conflict on whether deep skinning, freezing or grilling will reduce the likelihood of keriorrhea.