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DRAFI' AND PRECISIONAL DOCUMENT - FOR COORDINATION COMMmEE REVIEW ONLY artificial and human-modified system, ,- '.~..! :~-) Successful accomplishment of the Long Range Plan is dependent upon acquiring and utilizing information from a variety of disciplines, Considerable effort must be expended to characterize the biological altribules of individual fish species in the San Juan River, intra- and interspecific interactions, relation of various abiotic manipulations to the structure and dynamics of fish communities, and factors which may limit any species or native aquatic communities, CJ) -.J 3.0. GOALS 3.1. MAINTENANCE AND ENHANCEMENT OF THE NATIVE F1SH COMMUNITY OF THE SAN JUAN RIVER. The native fish community of the San Juan River basin was composed of at least eight species and perhaps ten, Among the verified native fishes, only speckled dace, flannelmouth sucker, and bluehead sucker remain comparatively common, Colorado cutthroat trout is eliminated from almost all areas of former occupancy. The range of roundtail chub is fragmented and it is generally rare where present. Mottled sculpin is restricted mainly to the San Juan River basin above Farmington, Colorado squawfish is found in low numbers only in mainstem habitats downstream of the Animas and San Juan confluence while razorback sucker is extremely rare and persists mainly as a few individuals that periodically enter the San Juan Arm of Lake Powell. If historically present, bony tail and humpback chub probably occurred mainly in the canyon-bound reaches of the lower San Juan River. Numerous human-induced modifications and manipulations of the aquatic habitats and introduction of non-native fishes have impacted all native fishes. including those that remain comparatively common. The overall strategy of maintenance and enhancement of the native fish community must be accomplished to enable the achievement of the more specific goals of recovery and conservation of Colorado squaw fish and razorback sucker. The successful accomplishment of this goal is dependent upon and will be assessed by the achievement of the following objectives, These general objectives provide the framework for development of interim management objectives and quantifiable recovery goals, 3, I, I, Mimickry of a natural hydrograph that reflects recent climatic (conditions to meet the biological and habitat needs of the fish while providing for human use of the water resources, 3,1.2, Conservation of all extant native fish species and enhancement of all depleted nalive species, 3,1.3, Removal or remediation of factors which impede or preclude successful accomplishment of conservation of the native fish community, 4