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Page 23 Detailed information regarding the historical and current status of roundtail chub and associated threats from Division data is found in Table 2-1. Southeastern Region Though accounts of roundtail chub in this region are somewhat rare, recent information suggests that roundtail chub were present, but never abundant in mainstem habitats such as the lower Green, San Juan, and Colorado rivers; present in the Price, San Rafael, and upper Dirty Devil rivers (Tyus et al. 1982, Holden and Stalnaker 1975, Bezzerides and Bestgen 2002); and abundant in the Dolores River (Bezzerides and Bestgen 2002). Cavalli (1999) suggests that roundtail chub may have been extirpated from the Price River due to low flows in 1977 and 1993, a localized rotenone detoxification problem in 1977, and/or pollution-caused fish kills that have occurred in the past 20 years. Current surveys in the Price River seem to support this hypothesis. Although roundtail chub were observed in the San Rafael River during 2005, they were rare. This rarity and the absence of roundtail chub during 2004 surveys may be indicative of a decline in abundance within the drainage (Walker and Hudson 2004). Cavalli (1999) suggests that roundtail chub are slow to re-populate unoccupied habitats; therefore, roundtail chub may not move back into de-watered habitats until many years after habitat is suitable again. Detailed information regarding the historical and current status of round tail chub and associated threats is found in Table 2-2. Southern Region Roundtail chub were thought to be historically present in the Escalante and Fremont rivers (Bezzerides and Bestgen 2002) and continue to be observed in the Escalante River (Fridell et al. 2004; Morvilius and Fridell 2005). Recent accounts in the Escalante River suggest that nonnatives pose a limited threat and that de-watering, pollution, and disease also likely pose threats to their presence in parts of the Escalante (Mueller et al. 1998). Detailed information regarding the historical and current status of round tail chub and associated threats is found in Table 2-3.