I have sent them an e-mail asking for methods used to produce the 90% mortality determined. If you wish you can do the same at [email protected].My bad on asking for the source of your data. I was hoping that you might actually have a document with references to how this "90%" mortality was determined. Was this mortality based on turbine passage, spillway passage, avian predation, GBT, etc? How was the data determined: by PIT-tags, radio-tags, acoustic tags or some other methodology? I tried to find some document in NPCC's site but frankly didn't feel like getting bogged down. I just don't believe the 90% bit.