SPECIES CODE: E006 V01
Listed Endangered (32 FR 4001, March 11, 1967) in the entire, except Salt and Verde R.
drainages, AZ, with Critical Habitat (59 FR 13374 13400, March 21, 1993).
pikeminnow is a member of the Cyprinidae family.
RANGE AND POPULATION LEVEL:
squawfish is endemic to the Colorado River
basin and much of its main tributaries.† The species has been collected in
Gila River and its tributaries, the San Pedro, Salt, and
the Colorado River mainstem from the United
Colorado River mainstem from the United States-Mexico
border to the Nevada State
line and the Salton Sea, which was sporadically filled
water from the Colorado River (Minckley 1973, 1985;
Colorado River and lower reaches of the Gunnison,
White, Yampa, Little Snake, Dolores, San
Juan, Uncompahgre, and Animas
1891; Ellis 1914; Beckman 1952; Lemons
1954; Johnson 1976; Valdez et al. 1982a), and Plateau Creek, a tributary
of the Dolores River
Fish and Wildlife Service, pers. comm. 1990.).
Colorado River mainstem (La Rivers 1962).
Mexico: San Juan
and Animas Rivers
(Koster 1957, 1960; Platania 1990).
Colorado, Green, Duchesne, San
Juan, White, and Dolores Rivers, and probably numerous
smaller streams (Ellis 1914; Holden 1973; Seethaler
Green River mainstem (Baxter and Simon 1970; Bosley
1960; Johnson and Oberholtzer 1987) and Little Snake River (Marsh et al. 1991).
Mainstem Colorado River and its tributaries and sloughs
from the United States-Mexico border to the Gulf of California
(Sonora and Baja
del Norte) (Follett 1961; Minckley 1979).
Colorado squawfish populations survive only in the Upper Basin, where their
numbers are relatively high only in the Green River Basin of Utah and Colorado
(compared with other rivers in the Upper Basin)(Tyus 1991).
construction of dams and water diversion has severely fragmented the speciesí
Fish and Wildlife Service. 1990. Colorado
Squawfish Recovery Plan. U.S.
Fish and Wildlife Service, Denver, Colorado.