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An reference seemingly pertinent to the waterfowl/fish-eating bird habitat issues is found in Bouffard and Hanson (1995). I discussed the potential implications of the data and recommendations found in this reference with CDOW Habitat Biologist J. Toolen. It appears that the case could be made that it would be beneficial for bird species diversity and reproduction success to have floodplain aquatic habitats of varying sizes that both contain fish and are fishless. This information was forwarded to D. Wydoski (USFWS) for incorporation into the floodplain Environmental Assessment. Job No. 4: Mainstem Removal of Nonnative Fishes to Benefit Native Fishes Job Objective: To estimate comparative removal rates of different strategies targeting reductions in numbers and biomass of selected nonnative fish species in riverine and floodplain habitats. Segment Objective 1: Review proposals for removal of nonnative fishes from mainstem riverine habitats. INTRODUCTION Job No. 1 and 2 dealt with the implications of the r r including their preventive intent in controlling nonnative fish impacts. Job No. 3 was involved with the active control measure on pond reclamation to remove and reduce impacts of nonnative fish species from Critical Habitat for the endangered fishes. Job No. 4 deals with the third component of nonnative fish control in western Colorado -- mainstem removal of nonnative fishes to reduce deleterious impact to endangered and other native fishes. The Segment Objective for this Job fit the workload as several measures to address nonnative fish control in rivers were reviewed. METHODS AND MATERIALS Written comments were supplied for the following proposals/documents pertaining to the issue of nonnative fish control in western Colorado rivers: Comments on Normative fishes in the upper Colorado River Basin and a strafe i& plan for their control (Tyus and Saunders 1996) including a compilation of comments by other CDOW administrator and biologists. • Proposal by CDOW to liberalize bag limits for nonnative sport fish within mainstem river reaches within Critical Habitat. An educational flyer prepared by CDOW with funding from the Recovery Program to inform anglers about the rationale for nonnative fish control, answers to questions about specific fish removal programs, and a discussion of warmwater fishing opportunities in western Colorado. Three proposals from the Recovery Program including removal of fishes from ponds reconnected to the mainstem Colorado River to restore floodplain habitat, a proposal to remove channel catfish from the Yampa River within Dinosaur National Monument, and a proposal to remove nonnative fishes from the Green River, Utah within the vicinity of Old Charlie Wash. 24