My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
WSP02694
CWCB
>
Water Supply Protection
>
Backfile
>
2001-3000
>
WSP02694
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
1/26/2010 12:46:27 PM
Creation date
10/11/2006 11:18:00 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8240.200.10.C.4
Description
UCRBRIP Flooded Bottom Lands
Basin
Colorado Mainstem
Date
1/1/1995
Author
UCRBRIP
Title
Floodplain Habitat Restoration - 1995 Work Plan
Water Supply Pro - Doc Type
Publication
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
123
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
<br />A -\ <br /> <br />water control structures, to hold water during the growing season. Some <br />sites will also have inlet water and fish control structures. Prior to <br />spring runoff each year, most sites will be dry (or rotenoned) to control <br />nonnative fishes to the extent possible. Most sites will also be <br />drainable, so that fishes can be harvested to evaluate results, and so <br />that nonnatives can be prevented from entering the main channel. <br /> <br />In accordance with approved stocking plans, wild and/or hatchery-produced <br />razorbacks will be stocked into the sites for rearing; and wild <br />razorbacks will have access to the site during high flows, through the <br />inlet or over the banks. larval razorbacks will be reared to a size that <br />allows individual tagging (e.g., PIT-tagging), and released into the <br />river (subject to approval by the Recovery Implementation Program). <br /> <br />The Technical Advisory Group recommended the use of wild larvae, because: <br /> <br />1) Theoretically, wild larvae have already imprinted on their <br />natal spawning site, and they will know where to go when they <br />reach maturity; <br />2) Wild larvae are believed to be more fit for survival in the <br />harsh riverine environment than are hatchery-produced fishes; <br />and <br />3) They are believed to genetically represent the existing wild <br />population. <br /> <br />The Genetics Panel, on the other hand, recommended the use of <br />hatchery-produced larvae, because: <br /> <br />1) Hatchery-produced larvae would come from known parentage, with <br />a genetic make-up known to represent the wild population; and <br />2) Wild larvae might be from only a few crosses, and not <br />genetically represent the wild population, resulting in <br />unnatural selection and inbreeding. <br />3) Imprinting and fitness of hatchery-produced larvae were not <br />discussed. <br /> <br />I recommend implementing Objective I with both wild larvae and <br />hatchery-produced larvae, using both floodplain habitats and rearing <br />(hatchery) ponds. The floodplain habitats, connected to the river, <br />would be funded by the Floodplain Habitat Restoration Program. The <br />rearing ponds, not connected to the river, would be funded under the <br />Propagation Element of the Recovery Implementation Program (RIP). <br />New sites will be designed and constructed under each element of the <br />RIP, but with different funding sources. Once the fish are reared <br />to a size where likelihood of survival in the river is improved, <br />they can be PIT-tagged and released. It must be understood, <br />however, that most will never be recaptured. The fact that there <br />are so few razorbacks, that our sampling efficiency in large rivers <br />is so poor, and that razorbacks are less vulnerable to capture than <br />other species, is justification for development of a sound <br />monitoring/evaluation program with refined sampling strategies to <br />evaluate the efficacy of the Floodplain Habitat Restoration Program. <br /> <br />3 <br />
The URL can be used to link to this page
Your browser does not support the video tag.