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Last modified
7/14/2009 5:02:30 PM
Creation date
5/20/2009 10:08:53 AM
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UCREFRP
UCREFRP Catalog Number
7741
Author
Burdick, B. D.
Title
A Plan to Evaluate Stocking to Augment or Restore Razorback Sucker in the Upper Colorado River - Final.
USFW Year
1992.
USFW - Doc Type
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<br />upper Colorado River. The reasons and importance for this were discussed in a <br />previous section of this plan. <br />Razorback sucker progeny (produced from paired matings) would be <br />maintained separately in tanks until they reach the desired size for tagging. <br />They would then be transferred to predator-free, grow-out ponds until they <br />reach the desired size (250 to 300 mm) for release into the river. Grow-out <br />ponds usually warm earlier and remain warm longer than the river resulting in <br />a longer growing season. Although stocking density for razorback sucker is <br />unknown, data from a previous study (Osmundson and Kaeding 1989b) provided a <br />starting point. In this study, razorback sucker were stocked in a Grand <br />Valley grow-out pond at a density of about 35 fish/acre. Their study <br />demonstrated that razorback sucker stocked in June at an average length of 55 <br />mm grew to an average of about 300 mm in six months; overall survival was <br />estimated to be 99.3% for a 2 1/2-year period following stocking into the <br />pond. Assuming growth rates could be duplicated, razorback sucker stocked <br />into ponds at a taggable length of 125-150 mm in the summer of one year could <br />be stocked the following spring into designated stream reaches. <br />Because productivity among ponds varies, growth and survival of razorback <br />sucker may also vary greatly among ponds. Consequently, it may be necessary <br />to experiment with different stocking densities in various ponds. Stocking <br />grow-out ponds with 100 to 125 mm long razorback sucker at a density of at <br />least 100-200 fish/surface acre is recommended initially. This stocking <br />density is based on the Osmundson and Kaeding study from age-0 razorback <br />sucker and discussions with other biologists (Roger Hamman and Mike Mulford, <br />pers. comm.) who have experience with catostomid culture. <br />28 <br />4
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