9383

• UCREFRP Catalog Number: 9383
• Author: SWCA, I.
• Title: Recovery Goals for the four Colorado River Endangered Fish Species.
• USFW Year: 2000.
• USFW - Doc Type: Logan.
• Copyright Material: NO

I
I
I
I
I
I
I
I
I
I,
I
I
I
I
I
I
,
I
I

TABLE OF CONTENTS

1 RODUCTION ......................................................... 1

.1 Background ......................................................... 1

1.2 Development of Recovery Goals and Criteria .............................. 2
1.3 Definition of Recovery . . . . . . . . . . . . . . . . . . . . . . . 0 . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.0 DESIGNA nON OF RECOVERY AREAS " 0 . . . . . . . . . . . . . 0 . . . . . . . . . . . . . . . . . . . . 5
2.1 Upper Colorado River Basin ............................................ 6
2.2 Lower Colorado River Basin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3 San Ju over Basin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . . . .0. . . . . . . . . . 9

3.0 THREATS T SPECIES ..............................................10
3.1 The Pr t Threatened Destruction, Modification, or Curtailment of Its Habitat or

Range .... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1.1 Streamflow modification ...................................... 10
3.1.2 Habitat Alteration .... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 Overutilization for Commercial, Recreational, Scientific, or Educational Purposes 14
3.3 Disease or Predation ................................................. 14
3.3.1 Disease and Parasites .............. 0 . . . . . . . . . . 0 . . . . . . . . . . . . . . . 14
3.3.1 Nonnative fishes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
3.4 The Inadequacy of Existing latory Mechanisms ........................ 17
3.5 Other Natural or Manmade,f ac s Affecting Continued Existence ............ 18
3.5.1 Water Quality . ~~. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
3.5.2 Hybridization .. 0 . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . . . . . . . . . . . . . . . . . 19
3.5.3 Pesticides and Pollutants. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

4.0 RECOVERY CRITERIA..... 0........................................ 0....24
4.1 Humpback Chub .............................................. 0 . . . . . 24
4.1.1 Site-Specific Management Actions To Achieve Recovery. . . . . . . . . . . . . 24
4.1.2 Objective, Measurable Recovery Criten . ... . . . . . . . . . . . . 0 . . . . . . . . .27
4.2 Colorado Pikeminnow . . . . . . . 0 . . . . . . . . . . . . . ., . . . . . . . . . . . . . . . . . . . . . . 30
4.2.1 Site-Specific Management Actions To ieve Recovery. . . . . . . . . . . . . 30
4.2.2 Objective, Measurable Recovery Criteria. . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.3 Razorback Sucker .........................0.................0.......34
4.3.1 Site-Specific Management Actions To Achieve Recovery. . . . . . . . . . . . . 34
4.3.2 Objective, Measurable Recovery Criteria. . . . . . . . . . . . . . . . . . . . . . . . . . 36

4.4 Bonytail ..................................................... 0 . . . . . 40

4.4.1 Site-Specific Management Actions To Achieve Recovery. . . . . . . . . . . . . 40
4.4.2 Objective, Measurable Recovery Criteria. . . . . . 0 . . . . . 0 . . 0 0 . . . . . . . . . 41
4.5 Statistical Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . . . . . . . . . . .. ......43
4.5.1 Monitoring ...................................... 0 . .. ...... 43
4.5.2 Population estimates and confidence intervals. . . . . . . . . . . . . . . . . . .44

11