Uh no, not really. Key word: "can." I've had Escolar before. Like, went to the supermarket, bought a few pounds of big ol' chunks that were labeled "Escolar,"

Uh no, not really. Key word: "can." I've had Escolar before. Like, went to the supermarket, bought a few pounds of big ol' chunks that were labeled "Escolar," and served said fish as the main entree for dinner. I do not recall anal leakage. They're fatty. That's it. A cooked Escolar will taste like it was fried in butter, even if you put it in the pan totally dry. Absent food sensitivities (which probably exist), I doubt it causes any leakage beyond that caused by any other source of the same amount of fat, oil, or grease.