I recall seeing someone with a suggestion on a topic like this. I haven't done it and I take no any opinion on it other than it beats letting the eel starve to death.
Find a narrow bottle (one opening just large enough for the eel to slip partly inside), place some food in it then place it near the eel. Supposedly, the eel will slip it's head in and eat, while the other fish will largely be unable (or unwilling) to do so.