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Last modified
7/14/2009 5:02:36 PM
Creation date
5/18/2009 12:09:01 AM
Metadata
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Template:
UCREFRP
UCREFRP Catalog Number
9552
Author
U.S. Fish and Wildlife Service.
Title
Management Plan for the Big-River Fishes of the Lower Colorado River Basin
USFW Year
2004.
USFW - Doc Type
amendment and supplement to the Bonytail, Humpback chub, Colorado pikeminnow, and Razorback sucker Recovery Plans.
Copyright Material
NO
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I <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />bonytail > 30 cm into Lake Moh~a~e (USFWS 1994b). Based on our <br />current knowledge, most of the fish <25 cm were eaten by predators or <br />otherwise perished because of their small size. Larger fish have either <br />been eaten, failed in some other way, or have yet to enter the catch <br />(Minckley and Thorson 2003). Annual week-long trips have been made to <br />Lake Mohave during the spring since 1980 to collect additional bonytail <br />broodstock. These trips generally resulted in few or no bonytail collected, <br />although occasionally ten or more fish were taken (Minckley and Thorson <br />2002). In addition to these trips, in 2001 and 2002, collecting efforts for <br />larger fish were expanded to five weeks. Qne large 52 cm bonytail was <br />collected in 2002 and transferred to Willow Beach National Fish Hatchery. <br />It was later transported to Dexter National Fish Hatchery but died enroute <br />(Minckley and Thorson 2003). Another five week effort will be made in <br />2003 to collect bonytail for broodstock. <br />Applicable Recovery Goals and Management Strategies: <br />' Recovery Goal: Maintain a genetic refugia and/orself-sustaining <br />population while moving towards recovery. <br />' Downlisting Criteria: <br />1. Genetic variability of bonytail identified and a genetic refuge <br />' (e.g. in Lake Mohave, Lake Havasu, or other suitable locations) is <br />maintained over a 5-year period. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />2. Two self-sustaining populations (e.g., mainstem and/or <br />tributaries) are maintained over 5-year period, starting with the first <br />point estimate acceptable to the Service, such that for each <br />population: <br />a. The trend in adult (age 4+; >250 mm TL) point estimates <br />does not decline significantly, and <br />b. Mean estimated recruitment of age-3 (150-249 mm TL) <br />naturally produced fish equals or exceeds mean annual <br />adult mortality, and <br />c. each point estimate exceeds 4,400 adults (MVP). <br />Delisting Criteria: <br />21 <br /> <br />
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