Fish and Wildlife Service (USFWS), 1990), speckled dace Rhinichthys osculus, flannelmouth sucker Catostomus latipinnis, and bluehead sucker C.
Most early fishery studies (1980-2002) focused on the lower 13.57-km corridor directly below Lower Atomizer Falls (hereafter, lower reach), which historically demarcated the upriver terminus of humpback chub, bluehead sucker, and flannelmouth sucker distributions (Kaeding and Zimmerman, 1983; Douglas and Marsh, 1996; Figs.
Rogers, "Factors affecting condition of flannelmouth
suckers in the Colorado River, Grand Canyon, Arizona," North American Journal of Fisheries Management, vol.
For example, the flannelmouth
sucker (Catostomus latipinnis), bluehead sucker (Catostomus discobolus), and white sucker (Catostomus commersonii) comprised 65-75% of the total catch in the upper Colorado River (Carter and others 1986).
Age and growth of bluehead suckers and flannelmouth
suckers in headwater tributaries, Wyoming.
Introduced into the frigid, bottle-green waters below Glen Canyon Dam for the pleasure of sport fishermen, trout have become a threat to fish native to the Colorado River--humpback chubs, flannelmouth
suckers, and bluehead suckers; they compete for food and prey on the young of these now rare or endangered species.
Non-listed species that will benefit from the plan include fish like the flannelmouth
sucker (Catostomus latipinnis), the yellow-billed cuckoo (Coccyzus americanus), and other neotropical migratory birds and bats that use riparian habitats.
The result is that three of the warm-water fish species native to the Grand Canyon (the humpback chub, razorback sucker, and flannelmouth
sucker) are either listed under the Endangered Species Act or considered candidates for listing.(124) Three other warm-water natives (the Colorado squawfish, bonytail chub, and roundtail chub) have been extirpated from the Grand Canyon.(125) As critical habitats like channels and sandbars have disappeared, so have the fish species that depend on them.
In such a scenario, southeastern blue suckers in the lower river may be a sink population dependent on reproduction upriver in Mississippi, similar to bluehead and flannelmouth
sucker populations above and below a salmonid barrier in the upper Colorado River system (Compton et al., 2008).
Hybridization of bluehead suckers with white (Catostomus commersonii), flannelmouth
(Catos tomus latipinnis), and mountain suckers (Catostomus platyrhynchus) has been documented in the Colorado River Basin (McAda, 1977; Bower, 2005; Compton, 2007; N.
Bluehead suckers (Catostomus discobolus) and flannelmouth
A recent population expansion of smallmouth bass in the Yampa River (33% of fish in our electric-seine samples, 2003-2007) occurred prior to our sampling and was concurrent with decline of small-bodied or juvenile native fishes including roundtail chub Gila robusta, speckled dace Rhinichthys osculus, bluehead sucker Catostomus discobolus, and flannelmouth
sucker Catostomus latipinnis since 2001 (R.