[buzzbaiter]

Millstone varies widely in type of water from shallow, fast moving riffles to nearly stagnant, snag-filled sections. Based upon what I read here, it was mostly the faster water surveyed and water near dams/eel weirs. Also gamefish tend to evade capture which is why state agencies often incorporate multi collection techniques over many days including nightboat electroshocking and trapnetting. I think this was more of a "what the heck lets see whats in there" survey as to opposed to a full court press, lets capture everything survey.