7358

• UCREFRP Catalog Number: 7358
• Author: Wydoski, R. S., K. Gilbert, K. Seethaler, C. W. McAda and J. A. Wydoski
• Title: Editor
• USFW Year: Series
• USFW - Doc Type: 1980
• Copyright Material: NO

4

7. Ames, L. 1976. The establishment of a data baseline of the aquatic insects of the Yampa
and White Rivers in northwestern Colorado. Dep. Zool. Entomol., Colorado State Univ.,
Fort Collins. 35 pp.

DISTRIBUTION, ENERGY, INSECT, RIVER-White, Yampa, SURVEY

Progress report on a study of aquatic insects in the Yampa and White Rivers near areas to
be affected by energy development.

8. Anderson, B. W." and R. D. Ohmart. 1979. Riparian revegetation: an approach to mitigating
for a disappearing habitat in the Southwest. Pages 481-487 in G. A. Swanson, techni-
cal coordinator. The mitigation symposium: a national workshop in mitigating losses
of fish and wildlife habitats. U. S. Forest Serv., Gen. Tech. Rep. RM-65.

ALTERATION, HABITAT, RIVER-Colorado, WILDLIFE

Presents a technique for mitigating for losses of southwestern riparian habitats. This
technique is based upon a pilot study of riparian vegetation on the lower Colorado River.

9.

Anderson, O. L.
Project.

1975. Management of scientific collaboration in the Lake Powell Research
Lake Powell Res. Proj. Bull. No. 12. 19 pp.

PLAN, RESERVOIR

Provides an outline of how collaboration has been accomplished between scientists from
various disciplines who are involved in research on Lake Powell.

10. Andreasen, J. K. 1973. Reproductive life history of Catostomus atdens and Catostomus
discobo1us in the Weber River, Utah. M. S. Thesis, Brigham Young Univ., Provo,
Utah. 31 pp.

DESCRIPTION, FISH, LIFE HISTORY

Although this study involved one fish species from outside the Colorado River, Catostomus
discobolus is 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.

11. Andreasen, J. K., and J. R. Barnes. 1975. Reproductive life history of Catostomus ardens
and C. discobolus in the Weber River, Utah. Copeia 1975(4): 645-648.

FISH, LIFE HISTORY

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 proliferate rapidly after spawning and spermatozoa overwinter in the lobules
of the testes. Recruitment oocytes (diameter(O.45 rom) are present in the ovary throughout
the year. The largest oocytes gradually increase ~n size until spawning occurs during May
to July in C. discobolus and mid-May to June in C. ardens. Spawning in 1972 occurred in a
period of maximum water temperature. The gonad Index data correlated well with the stages
of development of the testes and with increasing oocyte diameter.

12. Andrews, A. K. 1970. The distribution and life history of the fathead minnow (Pimephales
promelas Rafinesque) in Colorado. Ph.D. Thesis, Colorado State Univ., Fort Collins.
141 pp.

ABUNDANCE, AGE-GROWTH, ECOLOGY, FISH, FOOD HABITS, LIFE HISTORY, MOVEMENT, POPULATION,
SURVEY