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<br />Mancos River. The Mancos River was sampled 29 times, and in three different reaches
<br />during the early 1990s, Results of these sampling efforts were similar to results from
<br />previous decades. Native fish were generally more common in fish collections than non-
<br />native fish. Native fish collected throughout the Mancos River consisted of blue head
<br />sucker, flannel mouth sucker, speckled dace, roundtail chub, and in reach 3 mottled
<br />sculpin. Non-native fish consisted of common carp, red shiner, channel catfish, rainbow
<br />trout and fathead minnows. Most of the non-native fish were collected in reach I with
<br />the exception of rainbow trout which were only found in reach 3, Roundtail chub were
<br />relatively common in collections throughout the Mancos River.
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<br />Mc Elmo Creek. Me Elmo Creek was sampled on 4 occasions from] 990 to 1994.
<br />Results of sampling suggest that three native fish (bluehead sucker, flannelmouth sucker,
<br />and speckled dace) were common. One non-native fish (fathead minnow) was common
<br />in all collections, Three non-native fish (common carp, red shiner, ,and green sunfish)
<br />were collected less frequently,
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<br />San Juan Tributaries Upstream of Navajo Reservoir
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<br />Los Pinos River, The Los Pinos River was sampled six times during the early 1990s,
<br />Results ofrecent sampling are similar to the results of sampling from previous decades,
<br />especially regarding the presence of native fish, Native fish collected included bluehead
<br />sucker, flannelmouth sucker, mottled sculpin and speckled dace, The non-native fish
<br />(white sucker, rainbow trout, and brown trout) collected during the 1970s were all present
<br />in recent collections, however eight species of non-native fish that had not previously
<br />been collected in the Los Pinos River were detected during the 1990s, Non-native fish
<br />that were collected for the first time during the 1990s included the black bullhead,
<br />channel catfish, golden shiner, green sunfish, cutthroat trout, kokanee salmon, and
<br />fathead minnow,
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<br />Piedra River. The results of six sampling events on the Piedra River during the early
<br />1990s suggest that there had been little change in fish composition since the early 1980s,
<br />Native fish in this system consisted of the bluehead sucker, flannel mouth sucker, mottled
<br />sculpin, and speckled dace. Non-native species included white sucker, rainbow trout,
<br />brown trout, and one species that had not previously been collected in the Piedra River,
<br />the common carp. Stollsteimer Creek (a tributary to the Piedra River) was sampled once
<br />in 1992. Results of the single sampling event indicated that four native fishes (bluehead
<br />sucker, tlannelmouth sucker, mottled sculpin, and speckled dace) and two non-native fish
<br />(fathead minnow and white sucker) were present,
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<br />Navajo River. During 1992 and 1993, a total of seven sampling events were conducted
<br />on the Navajo River. Fish species reported during these recent surveys were similar to
<br />those which were found during the 1970s with the exception of three non-native fish
<br />(black bullhead, common carp, and green sunfish) that were only found during recent
<br />sampling events. Other non-native fish that appear to be more established in the Navajo
<br />River included the white sucker, rainbow trout, fathead minnow, and brown trout. Native
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<br />Draft Final Tributary Report
<br />Miller Ecological Consultants, Inc.
<br />
<br />JanuarJ 3], 2000
<br />Page 18
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