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G~)J553 5 BIOLOGICAL RESOURCES A. AOUATIC RESOURCES Goal: To protect, restore, and enhance native fish populations in Glen and Grand Canyons, as well as recreationally-important cold water sportfish populations in Glen Canyon, and the aquatic foodbase upon which they depend. Definition: Aquatic resources include invertebrates, algae, macrophytes, and fish, with specific concerns for Threatened and Endangered Species, and plant and animal matter contributing to the primary food base. MANAGEMENT OBJECTIVES. STAKEHOLDER INFORMATION NEEDS. MANAGEMENT ACTIONS A.l- Aquatic Food Base Definition: The aquatic food base is comprised of organisms originating from aquatic and riparian sources. It includes organisms such as Cladophora and other aquatic plants including macrophytes, diatoms, detritus, aquatic and terrestrial insects, and may include fish. MO 1: Maintain and enhance the aquatic food base in the Colorado River ecosystem to support desired populations of native and non-native fish. At a minimum, maintain continuously inundated areas for Cladophora and aquatic invertebrates at or above 5,000 cfs discharge levels from Glen Canyon Dam. IN 1.1 Determine status and trends in aquatic food base species composition and population structure, density and distribution and the influence of ecologically significant processes. IN 1.2 Determine the effects of past, present, and future dam operations under the approved operations criteria on the aquatic food base species composition, population structure, density, and distribution in the Colorado River ecosystem. IN 1.3 Determine the aquatic food base species composition, population structure, density, and distribution required to maintain desired populations of native and non-native fish in the Colorado River ecosystem. (IN's 1.7 through 1.12 were moved to Appendix Biological Resources 1) Revised 6-10-98