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used for mitigation, harvest augmentation, and broodstock development. <br />Supplementation of wild/natural runs has recently been receiving more emphasis. In <br />recent years, hatchery fish have been outplanted into streams. This program was usually <br />the result of extra hatchery production. Evaluations are underway on some of these <br />programs, including the South Fork of the Salmon and South Fork of the Clearwater <br />Rivers. Evaluation entail late summer fry and yearling snorkel counts primarily. <br />The Pahsimeroi River was one of the earliest locations where steelhead were outplanted. <br />This program introduced runs from the mid-Snake River to this tributary on the Salmon <br />River. Introducing the mid-Snake River run was made necessary by the construction of <br />three dams in the Hells Canyon section of the Snake River. These dams provide no fish <br />passage. Returning -adult steelhead are collected at the Pahsimeroi trap, but all natural <br />fish and some hatchery fish (to total one-third of run) are released upstream for natural <br />spawning. Adipose fin clips permit separation of hatchery fish and wild/natural fish. All <br />hatchery steelhead are adipose fin clipped in Idaho. The Pahsimeroi River project <br />releases approximately 900,000 smolts annually with an estimated adult return to Idaho <br />of 1.18 percent? Hatchery fish make up approximately 93 percent of the sportsman <br />catch on the Salmon River.3 Sport fishery regulations require that all wild/natural <br />steelhead (those with an adipose fin) be returned to the river. <br />Chinook <br />Springy -Historically the Snake River system produced most of the spring chinook salmon <br />in the Columbia River Basin (Fulton 1968). Today this run is only a remnant of what <br />used to occur. The LSRCP spring-summer adult goals for the Snake River were <br />established using the 1954-1967 counts at Ice`Harbor Dam.- The highest count was used <br />as the potential production for the Snake River. For spring-summer chinook salmon, the <br />potential run was estimated at 122,200 adults (Herrig 1990). In 1988, the spring chinook <br />salmon returning upstream of Ice Harbor Dam, the first dam in the Snake River, totaled <br />34,394 (Anon. 1989a). It was estimated that up to 80 percent of these spring chinook <br />were hatchery fish. <br />With very limited data, estimates were made that less than 10 percent of the chinook <br />salmon smolts passing Lower Granite Dam are wild a Data on the separation of <br />wild/natural from hatchery fish are being collected at upriver dams on the Snake River. <br />2Kent Ball, Idaho Department of Fish and Game, Salmon, Idaho, pers. comm., <br />January, 1990. <br />3ibid. <br />4Basham, p. 13. <br />14 <br />