Ictiobus, also known as buffalo fish or simply buffalo, is a genus of freshwater fish common in the United States, but also found in Canada, Mexico and Guatemala.
 They are the largest North American suckers, reaching up to 1.23 m in length.
 They are sometimes mistaken for carp because of the flat face and large, silver scales running along the body, though they lack the whisker-like mouth appendages common to carp.
 Buffalo fish live in most types of freshwater bodies where panfish are found, such as ponds, creeks, rivers, and lakes.
 "Ictiobus" was caught by the Lewis and Clark Expedition.
The Lewis and Clark Centennial Exposition, commonly also known as the Lewis and Clark Exposition, and officially known as the Lewis and Clark Centennial and American Pacific Exposition and Oriental Fair, was a worldwide exposition held in Portland, Oregon, United States in 1905 to celebrate the centennial of the Lewis and Clark Expedition.
 While not officially considered a World's Fair by the Bureau of International Expositions, it is often informally described as such; the exposition attracted both exhibits and visitors from around the world.
 During the exposition's four-month run, it attracted over 1.6 million visitors, and featured exhibits from 21 countries.
 Portland grew from 161,000 to 270,000 residents between 1905 and 1910, a spurt that has been attributed to the exposition.
Rex Ziak (pronounced "zeek") is a writer, historian, tour guide, and documentarian, who lives in Naselle, Washington, United States.
 Known for his Lewis and Clark studies, he is the author of "In Full View."
 After careful study of the expedition's journals and of the geography of the Columbia River estuary, Ziak discovered the previously unknown fact that from November 7, 1805 to December 6, the Lewis and Clark expedition stayed in what is now Pacific County, along the Long Beach Peninsula.
 This finding took six years for Ziak to piece together, using the comments in the expedition's journals to find the locations the explorers stopped at on their trip.
 A controversy arose between Oregon, long considered the end of the expedition, and Washington's historians over Ziak's findings, with many historians in Washington and elsewhere supporting his discovery and many in Oregon opposing it.
 In 1999, soon after his announcement, Ziak and David Nicandri, director of the Washington State Historical Society, began petitioning to give the newly found ending location, a camping spot called Station Camp, National Landmark Status.
 In addition, that year, US Representative Brian Baird had an amendment passed that changed the "federal designation of the Lewis and CLark National Historic Trail as ending not in Oregon but in Oregon and Washington."
Lewis and Clark Pass, el.
 6424 ft is a mountain pass on the continental divide in Montana.
 It lies at the head of the drainages of the west flowing Blackfoot River and the east flowing Dearborn River.
 The pass is in the Helena National Forest in Lewis and Clark County.
 The Continental Divide Trail traverses north and south through the pass.
 At the time of the Lewis and Clark Expedition the pass was a much-used pathway where the native people living in what today is Montana crossed over the continental divide.
 The pass was crossed by Meriwether Lewis on July 7, 1806, on the return leg of the Lewis and Clark Expedition with a party of nine men and his dog Seaman.
 The pass was named for the expedition's two leaders–Lewis and William Clark.
 Lewis and Clark Pass is the only roadless pass on the entire Lewis and Clark National Historic Trail.
 It has gone from being one of the most used continental divide passes prior to the pioneer era to one of the least visited passes today.
 It can be accessed by a 1.5 mi trail.
 Visitors will encounter the pass much as Lewis did in 1806.
 The furrows left by the countless dog and horse travois that crossed the pass are still visible (though fading) and this is one of the places along the expedition's route that visitors may still encounter a grizzly bear.
 On a clear day, like Meriwether Lewis in 1806 one can see Square Butte in Cascade County, Montana, 40 mi to the northeast.
Colter Falls, also Coulter Falls, (4.3m) waterfall, nearly 0.5 mi in width, part of the Great Falls of the Missouri, on the Missouri River in north-central Montana.
 Downstream of Colter Falls lies Rainbow Falls, and upstream is Black Eagle Falls.
 The Lewis and Clark Expedition was known to discover Westslope cutthroat trout at the base of the falls.
 The falls is now flooded in the impoundment behind Rainbow Dam.
 As Rainbow Dam's reservoir is a run-of-the-river reservoir, it rarely is emptied, so the falls is rarely seen even in extreme drought.
 The falls was named by Paris Gibson, founder of the city of Great Falls, Montana, while they were not named by Lewis and Clark, who measured it at "6 feet 7 inches".
York (1770 – before 1832) was an African-American explorer best known for his participation with the Lewis and Clark Expedition.
 Enslaved by William Clark's father and passed down through a will to William Clark, he performed hard manual labor without pay, but participated as a full member of the expedition.
 Like many other expedition members, his ultimate fate is unclear.
 There is evidence that after the expedition's return, Clark had difficulty compelling York to resume his former status, and York may have later escaped or been freed, but nothing is entirely clear on this.
The westslope cutthroat trout ("Oncorhynchus clarki lewisi"), also known as the black-spotted trout, common cutthroat trout and red-throated trout is a subspecies of the cutthroat trout ("Oncorhynchus clarki") and is a freshwater fish in the salmon family (family Salmonidae) of order Salmoniformes.
 The cutthroat is the Montana state fish.
 This subspecies is a "species of concern" in its Montana and British Columbia ranges and is considered "threatened" in its native range in Alberta.
Sacajawea State Park is a 284 acre Washington state park located at the confluence of the Snake and Columbia rivers in the city of Pasco.
 The Lewis and Clark Expedition camped at this location on October 16, 1805.
 The park bears the name of the Shoshone woman Sacagawea who was an active member of the expedition and who was married to French-Canadian interpreter and explorer Toussaint Charbonneau.
 The park's Sacajawea Interpretive Center features exhibits about her and about the Lewis and Clark Expedition.
 Park activities include hiking, boating, fishing, swimming, waterskiing, birdwatching, interpretive programs, wildlife viewing, and horseshoes.
 The park has a single campsite, reserved for paddlers on the Northwest Discovery Water Trail.
Traveler's Rest was a stopping point of the Lewis and Clark Expedition, located about one mile south of Lolo, Montana.
 The expedition stopped from September 9 to September 11, 1805, before crossing the Bitterroot Mountains, and again on the return trip from June 30 to July 3, 1806.
 Traveler's Rest is at the eastern end of the Lolo Trail.
 It was declared a National Historic Landmark in 1960 and added to the National Register of Historic Places in 1966.
 The boundaries were subsequently revised, and mostly lie within the 51 acre Traveler's Rest State Park, which is operated by the Montana Fish, Wildlife & Parks.
 Significant archeological findings made in 2002, including latrine sites with traces of mercury and fire hearths, make this the only site on the Lewis and Clark National Historic Trail that has yielded physical proof of the explorers' presence.
 Records made by Lewis and Clark often spell "Traveler's" as "Traveller's".
 This spot is largely unchanged from the days of Lewis and Clark.
 From this location, Lewis and Clark split up to explore Montana during their return trip, not reuniting until they reached Sanish, North Dakota.
Black Sandy State Park, located 15 mi north of Helena, Montana, in Lewis and Clark County, is a Montana state park on the shores of Hauser Lake, which is formed by Hauser Dam.
 The dam, at an elevation of 3835 ft , was built in the early 1900s and named after former governor Samuel Thomas Hauser.
 The park is along the Lewis and Clark National Historic Trail.
 The Lewis and Clark Expedition passed through the area in 1805.
 Prior to 1980, Montana Power Company owned the land and operated the park as a recreation area.
 In 1980, Montana Power turned over management of the park to Montana Department of Fish, Wildlife and Parks (FWP).
 In 1982, it was designated a state recreation area.
 Later on the land was also turned over to FWP.

Question: The Lewis and Clark Expedition was known to discover a fish also known as what?
Answer: black-spotted trout