odd topic but living in the absolute northern most range of the species i am lucky to see perhaps some odd behaviors. one im currious to what others nationwide have to say about is distribution and species range. the missisiippii river was damed up years ago, and as a result the range of a number of native fish have been dramiticaly impacted. in particular sturgeon, shovel nose(sppoon bill), and too some extent flatheads. most fish progression will be stoped by one of the many dams throughout the twin cities streach, but some will make it as far as the next dam up which has no lock, and no fish runs. interestingly on some extreamly rare instances flatheads have been caught in the pool above(which runs some 70 miles or so, and directly feeds tons of creeks).This section gets fairly heavy use so i imagine these individuals are thrown over the dam by kids. my curiousity and question is, why did the Flatheads dissapeare from this section(as some would have originaly been here before the damming began)??? it varies in habitat from the other rivers in that it is all sand and gravel and basicaly clear water. in some spots exceptions, and muddy creeks exist. is it possible that a lack of suitable nesting spots slowly reduced the population?? or perhaps heavy bait harvesting of minnows in this section decimated the population. what sayeth the board??