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<br />
<br />Fish Sampling 1990 - 1994
<br />
<br />Between 1990 and 1994 there were more recorded fish collections on tributaries to the
<br />San Juan River than occurred in all the years prior to 1990 combined, Rivers that were
<br />sampled included the Animas, Florida, La Plata, Mancos, Los Pinos, Navajo, Piedra, and
<br />, San Juan. Smaller streams reported here included Cherry Creek, Long Hollow Creek, Mc
<br />Elmo Creek, and Stollsteimer Creek.
<br />
<br />San Juan Tributaries Downstream of Navajo Reservoir
<br />
<br />Animas River, Recorded sampling efforts in the Animas River indicate that this stream
<br />was sampled at least 70 times during the early 1990s, Native fish that appear to be
<br />common throughout the Animas River include the bluehead sucker, tlannelmouth sucker,
<br />mottled sculpin and speckled dace. Only one individual ofroundtail'chub was collected
<br />on one occasion during this time period, This suggests that this species has become rare
<br />in occurrence in the Animas River. Non-native fish that occurred commonly in
<br />collections included the common carp, white sucker, rainbow trout, brown trout, and in
<br />the upper reaches cutthroat trout. Fathead minnows and green sunfish were also
<br />collected, but on a less frequent basis.
<br />
<br />Florida River, The Florida River has been sampled 21 times since 1990. Native fish
<br />collected included the bluehead sucker, tlannelmouth sucker, mottled sculpin, speckled
<br />dace and roundtail chub. Although roundtail chubs were often present in collections they
<br />always constituted a small proportion of the total fish collected. Non-native fish in
<br />collections consisted of black bullhead, common carp, white sucker, green sunfish,
<br />fathead minnow, cutthroat trout, rainbow trout, and brown trout. Of the non-native fish
<br />collected the white sucker and brown trout were most common in occurrence, The white
<br />sucker (which was not found in collections made during the 1970s, and was the least
<br />common non-native fish collected during the 1980s) was found in more than 75% of all
<br />fish collections made on the Florida River during the early ]990s,
<br />
<br />La Plata River, Between 1990 and 1994 the La Plata River was sampled 68 times, and
<br />two tributaries (Cherry Creek and Long Hollow Creek) were sampled three times for a
<br />total of 71 sampling events in the La Plata drainage. Native fish that appear to be
<br />abundant throughout the La Plata River include the bluehead sucker, tlannelmouth
<br />sucker, and speckled dace. Roundtail chub were present in some collections from reach I
<br />and 2, however only one specimen was collected in reach 3, In a small section of reach
<br />2, from the state line north for about 2 miles, roundtail chubs were numerous in
<br />collections, Non-native fish collected in the La Plata consisted ofrainbow trout, brown
<br />trout and fathead minnow, Other non-native species that were less common in
<br />collections included black bullhead, red shiner, and brook trout. The two sampling sites
<br />on Long Hollow Creek produced three native fish (bluehead sucker, tlannelmouth sucker
<br />and speckled dace), and one non-native fish (brown trout), Only blue head suckers were
<br />captured at the site on Cherry Creek,
<br />
<br />Draft Final Tributary Report
<br />Miller Ecological Consultants, Inc.
<br />
<br />January 3], 2000
<br />Page 17
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