This summer as many as 150 thousand fish died in four major fish kills in southeast Minnesota. Contamination from area farms was blamed for two of the kills and a spill from a local packing plant for a third. While news of the kills attracted lots of media attention, Department of Natural Resources officials don't even think they're finding all of the kills that take place. They're forming a group of scientists to try to figure out why fish kills occur and how to prevent them.