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OVERVIEW TABLE 1.5 Physical Limitations on Fisheries of Perennial Streams Miles Percents Siltation 265,000 39.8 Bank erosion 152,000 22.8 Channel modifications 143,500 21.5 Migratory blockages 39,700 6.0 Bank encroachment 9,000 1.4 NOTE: Streams surveyed in 1982. sPercent of the 666,000 miles surveyed SouxcE: Judy et al., 1984. 29 Little change seemed to occur over the intervening 5-year period (Table 1.6). Regardless of when the survey was conducted, only 5 or 6 percent of the miles surveyed supported high-quality sport fisheries or exotic species. Minimal or lower-quality species of fish were found in more than one-third of the streams. Approximately three-quarters of the streams would support only slow-quality sport fishery. TABLE 1.6 Level of Aquatic Sport Species Supported by Fisheries of Perennial Streams Surveyed in 1977 and 1982 Class Level Supporteds 1977 Miles Percent 1982 Miles Percent 0 No species 29,000 4 29,000 4 1 Nonsport species 48,000 7 49,000 7 2 Minimal sport species 170,000 26 166,000 25 3 Low sport species 224,000 34 228,000 34 4 Moderate sport species 155,000 23 156,000 23 5 High sport and special species 38,000 6 35,000 5 Surveyed 666,000 100 666,000 100 NOTE: Streams surveyed in 1982. sThe fish are classed according to nongame (e.g., carp), game (e.g., bass), and spe- cial species (e.g., cutthroat trout). The descriptors of abundance (minimal, low, mod- erate, and high) were subjectively determined, the assessment being made by person- nel of the U.S. Fish and Wildlife Service and state fish management agencies. SOURCE: Judy et al., 1984.