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CHAPTER 1 - INTRODUCTION This Final Report was submitted to Bureau of Reclamation (Reclamation) by BIO/WEST, Inc. (B/W) in partial fulfillment of Reclamation Contract No. 0-CS-40-09110 entitled Characterization of the Life History and Ecology of the Humpback Chub in the Grand Canyon. The report presents fmdings of a fisheries investigation as part of Reclamation's evaluation of Glen Canyon Dam operations. Information contained in this report was collected in 36 monthly trips through Grand Canyon from October 1990 through November 1993 and is summarized in Trip Reports and Annual Reports for 1990 (Valdez 1991),1991 (Valdez et al. 1992), and 1992 (Valdez and Hugentobler 1993). An Executive Summary and an Appendix were issued as companion documents to this Final Report and an electronic database is available from BIW or Reclamation for data collected during this investigation. Six supplemental reports were produced in response to specific tasks or amendments of the contract: ~ Supplement No. I: Data Collection Plan ~ Supplement No. II: Evaluation of Sampling Design ~ Supplement No. ill: Photographic Record of Humpback Chub ~ Supplement No. IV: Grand Canyon Fisheries Integrated (GCFIN) Database ~ Supplement No. V: Development of a Population Model for Humpback Chub (Gila ~ in Grand Canyon. ~ Supplement No. VI: Flow Routing Model A complete list of reports and publications produced during this investigation is included in Appendix A. The reader is referred to the Executive Summary and to Chapter 10 - INTEGRA nON for a synopsis of findings. BACKGROUND This investigation was conducted as part of the Native and Endangered Fish (NEF) Studies (Fig. I- 1) of the Phase II Draft Integrated Research Plan (DIRP, U.S. Department of Interior 1990) of the Glen Canyon Environmental Studies (GCES) (See Box 1-1). The DIRP was developed as a roadmap to provide overall research direction and logic, as well as technical information transfer to GCES researchers, the scientific community, and the interested public. The objective of the NEF Studies GCES I I I I r I I II '" IV V VI Economic Recreation Archaeology Geomorphology Beach Studies Hydrology Studies Studies Studies and Geologic Transport! Studies Mapping Sediment VII VIII IX X XI Water Qualityl Trout Native and Bald Eagle Long- Term Productivity Dynamics Endangered Studies Monitoring Studies Fish Studies Proaram Fig 1-1. Components ofthe Glen Canyon Environmental Studies (GCES) Phase II Draft Integrated Research Plan.