My two friends recently had a dish called Butterfish (or Escolar). They loved it and raved on and on about it and said I had to try it. So I did some research on it to see what it was so I could try it, and learned that its a trendy fish in some upper-class restaurants, gaining popularity. I also learned that it contains a high level of gempylotoxin, a strong purgative oil similar to castor oil and may lead to intestinal cramping and diarrhea.
My two friends have stomachs like goats. When I showed thiem this article they both busted up laughing and admitted they had severe gastric problems and that they didnt tell each other because they were embarrassed. One friend though there was maybe something wrong with his breakfast, the other thought he was coming down with something. They thought it was hysterical in hindsight...
Do your research if you want to try it. I have not had it so I cannot say how it would affect a crohnie but if my 2 friends got sick (not CD'ers) I can only assume it would do numbers on me. I think I'm going to stick to salmon!!!