ranchers, you guys, the fda uses them for testing to determine if there is toxic elements in the air and water, the effects can be on the endocrine system, they have been doing this for a long time, and have training videos that teach their employees how to do it. >> the flood head minnow is used in toxicity tests, this method has been developed over the last twenty years in duluth, minnesota. >> you know, 2009 doesn't sound like it was all that long ago until you see a training video main in 2009, and it feels like, where is the delorean? anyway, this fat head minnow