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~ , <br /> <br />1 <br />' 1. The Grand Canyon population is maintained as a core over a 5- <br /> year period, starting with the first point estimate acceptable #o the <br /> Service, such that: <br /> i <br /> mates. <br />a. The trend in adult (age 4+; >200 mm TL) .point est <br /> does not decline significantly, and <br />' b. mean estimated recruitment age of age-3 (150-199 mm <br /> TL) naturally produced fish equals or exceeds adult <br /> mortality, and <br />' c. each core population estimate exceeds 2,100 adults (MVP). <br /> Delisting Criteria: <br />' <br /> 1. The Grand Canyon population is maintained as a core over a 3- <br /> year period beyond downlisting, starting with the first point estimate <br />' acceptable to the Service, such that: <br /> a. The trend in adult (age 4+; >200 mm TL) point estimates <br /> does not decline significantly, and <br />' b. Mean estimated recruitment of age-3 (150-199 mm TL) <br /> naturally produced fish equals or exceeds mean annual <br /> adult mortality, and <br />' c. Each core population estimates exceeds 2,100 adults <br /> (MVP) <br />' Management Strategies: The AMWG is currently developing a <br />Comprehensive Action and Management Plan for humpback chub <br />in Grand Canyon. Once completed, that plan will be reviewed in the <br />' context of the LCRMP to determine if additional actions are <br />necessary to meet the Recovery Goals. <br />' ~ Razorback Sucker <br /> Current Status and Recovery Efforts: Based on collection records, the <br />' razorback sucker is very rare in this reach with fewer than 20 individuals <br /> reported since 1944 (Maddux e# al. 1987, Minckley and Carothers 1978, <br /> Valdez and Ryel 1995). individuals that were collected were generally <br />' taken from side tributaries (Paris and Little Colorado rivers and Bright <br /> Angel Creek. Hybrids (razorback sucker X flannelmouth sucker) have <br /> <br /> <br />16 <br /> <br />