 These impoundments coincided with a postwar fishing boom, additional funds from sales of fishing licenses for the first large-scale attempts at bass fisheries management.This was especially true in the southern United States, where the largemouth bass thrived in waters too warm or turbid for other types of gamefish.With increased industrialization and development, many of the nation's eastern trout rivers were dammed, polluted, or allowed to silt up, raising water temperatures and killing off the native brook trout.