BROOKLYN - A group of Orthodox rabbis are saying that a Jewish staple, lox, isn?t kosher.

The rabbis say that a small, parasitic worm often affecting salmon makes the fish no longer kosher. They announced a ban on consumption of the fish last month.

However, bagel-and-lox lovers aren?t taking the news lightly. Other rabbis say the issue has already been resolved in historic texts dating back to 2,000 years ago.

The issue arose again after scientists discovered the worm, Salmon Anisakis, has mutated to mature quicker than normal.