|
<br />c'
<br />C-,
<br />i'':>
<br />I .'
<br />
<br />Ul
<br />
<br />~
<br />
<br />species was similar to results reported during the 1970s. In the lower two reaches of the
<br />Mancos River (reach I and 2) four native fish species were collected in samples, These
<br />fish included bluehead sucker, tlannelmouth sucker, roundtail chub and speckled dace,
<br />Native fish in the upper Mancos (reach 3) consisted of blue head sucker, mottled sculpin
<br />and speckled dace, Non-native fish species collected in the lower reaches included
<br />common carp, red shiner, channel catfish, and rainbow trout. At site locations within
<br />reach 3 non-native fish that were collected included rainbow trout, brown trout, and
<br />fathead minnow, The two fish collections in Navajo Wash produced bluehead sucker,
<br />flannelmouth sucker, speckled dace and roundtail chub, Only native fish were collected
<br />in Navajo Wash during these sampling events, Roundtail chubs were present in both of
<br />the samples taken at Navajo Wash, and in all but one of the collections taken from the
<br />lower two reaches of the Mancos River during this time period,
<br />
<br />Me Elmo Creek. Me Elmo Creek was sampled on seven occasions between 1980 and
<br />1989. The presence and absence of various fish species was similar to data recorded
<br />during the 1970s. Native fish collected included bluehead sucker, flannelmouth sucker,
<br />and speckled dace. Non-native fish included common carp, red shiner, and speckled
<br />dace,
<br />
<br />San Juan Tributaries Upstream of Navajo Reservoir
<br />
<br />Piedra River, The Piedra River was sampled on seven occasions during the 1980s.
<br />Native fish collected included bluehead sucker, tlannelmouth sucker, mottled sculpin and
<br />speckled dace, Non-native fish that were common in collections included rainbow trout,
<br />brown trout, and white sucker. Three non-native fish that were collected but considered
<br />uncommon in occurrence (each collected only once in seven sampling occasions)
<br />included the fathead minnow, channel catfish, and cutthroat trout. Two sampling events
<br />during 1983 reported that the white sucker was the most common fish in collections.
<br />
<br />Los Pinos River. The Los Pinos River was not sampled between 1980 and 1989,
<br />however one location on Rock Creek, a tributary to the Los Pinos, was sampled, One
<br />native fish (the speckled dace) and two non-native fish (fathead minnow and white
<br />sucker) were collected,
<br />
<br />San Juan River, The San Juan River upstream from Navajo Reservoir was sampled on
<br />three occasions between 1980 and 1989, Results of fish collections indicated the
<br />presence of four native fish species (bluehead sucker, flannelmouth sucker, mottled
<br />sculpin, and speckled dace), and two non-native species (rainbow trout and brown trout),
<br />
<br />General trends in fish collections between 1980 - 1989 indicated that the presence and/or
<br />absence of native fish was more consistent among collections than non-native fish
<br />species. The white sucker appeared to become more prominent in collections, while
<br />black bullhead and plains killifish were not found in any collections during this period,
<br />White sucker were reported from the Animas, Florida, Piedra, Los Pinos, and San Juan
<br />river systems, Roundtail chub were collected in the Animas, Florida, and Mancos river
<br />systems,
<br />
<br />Draft Final Tributary Report
<br />M iller Ecological Consullants, Inc.
<br />
<br />Jannary 31, 2000
<br />Page 16
<br />
|