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1 TABLE OF CONTENTS DISCLAIMER .............................................................. i EXECUTIVE SUMMARY .......................................................iii ACKNOWLEDGMENTS ......................................................... v PART I. INTRODUCTION ................................................. 1 History ...................................................... 1 General Description ........................... ............. 2 Distribution and Abundance ....................:... ......... 2 Historic Distribution.. ....................... ..... 2 Present Distribution and~Abundance ............... ...... 4 Life History ................................................. 6 Habitat Preference ....................................... 6 Temperature Preference ................................... 6 Reproduction and Migration ............................... 8 Growth ................................................... 11 Food Habits .............................................. 12 Cultural, Economic, and Biological Importance ................ 13 Importance of Tributaries .................................... 14 Reasons for Decline .......................................... 14 Sensitive Areas and Priority Recovery Areas .................. 17 Sensitive Areas .......................................... 17 Priority Areas for Recovery .............................. 17 PART II. RECOVERY ..................................................... 20 Ob.iective .................................................... 20 Downlisting Criteria ......................................... 21 Delisting Criteria ........................................... 21 Stepdown Outline ............................................. 23 Narrative .................................................... 27 LITERATURE CITED ............................................. 40 PART III. IMPLEMENTATION SCHEDULE ...................................... 51 vi n 1 1 1