Cooperative Research Units
Education, Research And Technical Assistance For Managing Our Natural Resources
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Biomarkers of endocrine and reproductive disruption in fish of Lake Mead and the Colorado River


January 2007 - June 2010


This project addresses the endocrine and reproductive condition of fish in the Lake Mead ecosystem and is part of an overall study of the environmental health of the lake. Sampling will be conducted in multiple sites over a period of 1 year. In addition to standard morphometric measurements, reproductive endpoints will also be measured and include plasma sex steroid and vitellogenin concentration. Results obtained will be analyzed in the context of the presence and concentrations of environmental contaminants.

Research Products and Activities

Peer Reviewed Publications

  • Goodbred, S. L., Leiker, T. A., Pati�o, R., Jenkins, J. A., Denslow, N. D., Orsak, E., and Rosen, M. R. 2007. Organic chemical concentrations and reproductive biomarkers in common carp (Cyprinus carpio) collected from two areas in Lake Mead, Nevada, May 1999 - May 2000. U. S. Geological Survey Data Series 286, 18 p.
  • Patiño, R., Rosen, M.R., Orsak, E.L., Goodbred, S.L., May, T.W., Alvarez, D., Echols, K.R., Wieser, C.M., Ruessler, S., Torres, L. 2012. Patterns of metal composition and biological condition and their association in male common carp across an environmental contaminant gradient in Lake Mead National Recreation Area, Nevada and Arizona, USA. Science of the Total Environment 416:215-224.

Current Staff

Federal Staff: 95

Masters Students: 238

Phd Students: 144

Post Docs: 54

University Staff: 239

5 Year Summary

Students graduated: 673

Scientific Publications: 1905

Presentations: 4236



Funding Agencies

  • Lake Mead National Recreation Area


Cooperative Research Units Program Headquarters Cooperators

  1. U.S. Geological Survey