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<br />o <br />...., <br />'"-.... <br /> <br />13 <br /> <br />. .~) <br /> <br />l- <br />OJ <br /> <br />Table 2.1. Native Fish Fauna of the San Juan River Basin <br /> <br />Species Status <br /> <br />Colorado River Cutthroat Trout <br />Roundtail Chub <br />Bony tail Chub <br />Colorado squawfish <br />Speckled Dace <br />Flannelmouth Sucker <br />Bluehead Sucker <br />Razorback Sucker <br />Mottled Sculpin <br /> <br />CO <br />NM <br />E <br />E, CO, NM, UT <br />C <br />A <br />A <br />E, CO. UT <br />R <br /> <br />E = <br />CO = <br />NM = <br />UT = <br />A = <br />C = <br />R = <br /> <br />Endangered, United States <br />Protected, Colorado <br />Protected, New Mexico <br />Protected, Utah <br />Abundant, generally distributed and typically numerous <br />Common, generally distributed but typically not numerous <br />Rare, not generally distributed and never numerous <br /> <br />2.1.2 Non-native Fish Fauna <br /> <br />Since the late l800's, at least 40 non-native fish species have <br />been introduced to the Upper Colorado River Basin. In the San <br />Juan River SUb-basin, 23 non-native fish species have been <br />reported (Table 2.2). Of these, 21 have been documented in the <br />San Juan River since 1987. Most non-native species were rare (or <br />incidentally captured in the San Juan arm of Lake Powell). In <br />warmwater reaches of the mainstem San Juan River, common carp and <br />channel catfish were the only common and generally distributed <br />non-native fish species. Rainbow, cutthroat (Snake River <br />subspecies), and brown trouts were common in coldwater reaches of <br />the San Juan River (including the Navajo Dam tailwater reach) and <br />its upper tributaries. Red shiner, fathead minnow, and <br />mosquitofish were the most common non-native species found in <br />low-velocity habitats associated with the mainstem San Juan <br />River. Other non-native fish species, such as black bullhead, <br />plains killifish, green sunfish, and largemouth bass, were very <br />rare and several probably derived from upstream or downstream or <br />off-channel impoundments. <br /> <br />Some non-native fish species were introduced by federal, state, <br />and tribal agencies to establish food or recreational fisheries <br />while others became established as a result of bait minnow, <br />fishermen, or accidental releases. In New Mexico and Utah, <br />stocking of non-native warmwater species has been discontinued, <br />