Table Of Contents Page Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Methods of Taking and Recording Data Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 General Description of the Area. . . . . . . . . . . . . . . 7 A Brief Geologic History. . . . . . . . . . . . . . . . . . . . . 7 The Present Situation. . . . . . . . . . . . . . . . . . . . . . . . 10 THE STREAMS General Description. . . . . . . . . . . . . . . . . . . . . . . . . 11 Drainage Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1. Rogue Drainage. . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2. Klamath Drainage. . . . . . . . . . . . . . . . . . . . . . . . . . 26 Ecological Considerations. . . . . . . . . . . . . . . . . . . . 40 1. The Fish Present. . . . . . . . . . . . . . . . . . . . . . . . . . . 40 2. Water Temperature. . . . . . . . . . . . . . . . . . . . . . . . . 41 3. Chemical Conditions. . . . . . . . . . . . . . . . . . . . . . . . 42 4. Available Aquatic Foods. . . . . . . . . . . . . . . . . . . . . 44 5. Shade and Shelter. . . . . . . . . . . . . . . . . . . . . . . . . . 49 6. Stream Grade. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 TROUT STUDIES Species, Distribution, and Frequency. . . . . . . . . . . . 51 1. Brook Trout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 2. Dolly Varden Trout. . . . . . . . . . . . . . . . . . . . . . . . . 52 3. Rainbow Trout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 4. Brown Trout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Trout Foods Based on Stomach Analysis. . . . . . . . . 55 1. Foods of Brook Trout. . . . . . . . . . . . . . . . . . . . . . . 58 2. Foods of Dolly Varden Trout. . . . . . . . . . . . . . . . . 59 3. Foods of Brown and Rainbow Trout. . . . . . . . . . . 60 Age and Growth Studies. . . . . . . . . . . . . . . . . . . . . . . 60 Lengths, Weights, and Condition Factors. . . . . . . . 81 1. Condition factor of Brook Trout. . . . . . . . . . . . . . 82 2. Condition factor of Rainbow Trout. . . . . . . . . . . . 86 3. Condition factor of Dolly Varden. . . . . . . . . . . . . 88 4. Condition factor of a Brown Trout. . . . . . . . . . . . 88 5. Conclusions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Reproductive Capacity 1. Sex Representation in the Catch. . . . . . . . . . . . . . 90 2. Counts of Eggs in Ovaries of Trout. . . . . . . . . . . . 91 3. Natural Reproduction. . . . . . . . . . . . . . . . . . . . . . . 92 Page Parasites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 Unusual Observations. . . . . . . . . 96 1. Malformed Brook Trout. . . . . . . 96 2. Porcupine Quill in Side of Rainbow Trout. . . . . . . . . . . . . . . . . . . 96 Stream Trout Management in Crater Lake National Park General Fish Policy of the National Park Service. . . . . . . . . . . . . . . . . . . . 98 Past Practices, Policies, and Regulations. . . . . . . . . . . . . . . . . 99 1. Purposes of Planting Fish. . . . . 100 2. Planting Records. . . . . . . . . . . 101 3. Present Regulations. . . . . . . . . 105 4. Discussion. . . . . . . . . . . . . . . . 105 Proposed Management Plan. . . . . . 106 1. Recommended Fishing Regulations 107 2. Recommended Stocking Program. . 110 Summary and Conclusions. . . . . . . . 114 Literature Cited. . . . . . . . . . . . . . . 116 Appendix. . . . . . . . . . . . . . . . . . . . 181