7086

• UCREFRP Catalog Number: 7086
• Author: U.S. Fish and Wildlife Service.
• Title: Indexed, Annotated Bibliography of the Endangered and Threatened Fishes of the Upper Colorado River System.
• USFW Year: 1977.
• USFW - Doc Type: Denver, Co.
• Copyright Material: YES

1. Abbott, C. C. 1861. Descriptions of four DESCRIPTION
new species of North American Cyprinidae. ENDANG. FISH
Proceedings Philadelphia Academy TAXONOMY
Natural Science 12(1860):473-474. COLORADO R.
4
First description of the humpback sucker,
Xyrauchen texanus, from the "Colorado" and
"New" rivers. (Wydoski)
2. American Society of Civil Engineers, Committee FLOW
on Sedimentation. 1971. Sediment transporta- SEDIMENT
tion mechanics: fundamentals of sediment
transportation. Proceedings American
Society Civil Engineers 97 (HY12):1979-
2022.
Reviews many aspects of sediment transport and
stream bedload movement. (Wydoski)
3. Andreasen, J. K. 1973. Reproductive life SPAWNING
history of Catostomus ardens and Catostomus DESCRIPTION
discobolus in the Weber River, Utah. M.S. FISH
thesis, Brigham Young University, Provo, LIFE HISTORY
Utah. 31 pp.
Although this study involved fish from outside
of the Colorado River, one species (Catostomus
discobolus) is also found in the Colorado River
basin. The yearly reproductive cycle for these
two fish was followed by a histological study
of the testes and measurements of oocyte diameters.
A monthly gonadal index was calculated for each
sex and species. Spawning in 1972 occurred
during maximum water temperature. (Wydoski)
4. Andreasen, J. K. 1973. Reproductive life SPAWNING
history of Catostomus ardens and C. BEHAVIOR
discobolus in the Weber River, Utah. FISH
Copeia 1975(4):643-648. (Abstr.) PHYSIOLOGY
9, 13
The yearly reproductive cycle in Catostomus
ardens and C. discobolus was studied by means
of gonad indices, histological sections of the
testes, and measurements of oocyte diameters.
Spermatocytes proliferated rapidly following
spawning and spermatozoa overwinter in the
lobules of .the testes. Recruitment oocytes
(less than .45 mm) are present in the ovary
13