I recently heard from two separate people about a custom not to eat any meat at the Seder (i.e. only fish and chicken are eaten). This was surprising to me, as the minhag mentioned in the Mishnah, Gemara and poskim refers specifically to roasted meat. Does anyone have information about this?
Taz (Orach Chaim 476:2) mentions such a custom. The people who did so were concerned that any kind of meat might be confused with roast (and as YS noted, the Ashkenazic custom is indeed not to eat roast meat at the Seder).
However, he understands Tur to be saying that it is improper to do so, because the joy of Yom Tov includes eating meat; the best approach, he says, is to eat cooked meat and not worry about any possible confusion.
Many Sephardim specifically eat lamb or goat during the Seder as a remembrance.