justonemoretank;3743557; said:Krill contains thiaminase. It should not be fed exclusively. Please read here on thiaminase:
http://www.wetwebmedia.com/ca/volume_6/volume_6_1/thiaminase.htm
Not so much krill as prawn. Really the only fish that contain large amounts of thiaminase are cyrpinids, e.g. goldfish.