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<br />(..') <br />.::) <br />(-) <br />;".1) <br />C,jl <br />o <br /> <br />DRAFT <br /> <br />2. The present conditions of the San Juan River have been significantly <br />altered or impacted by the operation of Navajo Dam and other man-caused <br />impacts along the River. <br /> <br />3. There is an urgent need to collect in-depth biological, physical. and <br />chemical information on the fish and their habitats. and to assess <br />application all information. <br /> <br />In addition, the biologists agreed that the following major <br />assumptions/hypotheses need to be tested in the San Juan River Basin: <br /> <br />1. Late spring and early summer flows are important for spawning and <br />recruitment (flow and temperature) of Colorado squawfish. <br /> <br />2. Seasonally flooded lowlands may be important for razorback sucker <br />spawning. <br /> <br />3. The abundance of native species is directly related to predation and <br />competition by non-native species. <br /> <br />4. Elimination of instream migration barriers would increase access to <br />spawning areas and decrease .impacts on drifting larvae of Colorado <br />squawfish and razorback sucker. <br /> <br />5. The San Juan River, during certain hydrologic conditions, appears to <br />have suitable habitat for successful spawning. nursery and rearing of <br />native species. <br /> <br />6. Various life histcry stages of the native fish species may be <br />adversely affected by water quality impacts of the San Juan River, <br /> <br />7. Historic flow conditions (discharge volume, timing. duration, water <br />quality, and habitat availability) in the San Juan River were good for <br />native fish including the rare and endangered fish species. <br /> <br />3 <br />