My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
7339
CWCB
>
UCREFRP
>
Public
>
7339
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/11/2009 11:32:56 AM
Creation date
8/10/2009 3:22:23 PM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
7339
Author
Valdez, R. A.
Title
A Review of the Hatchery Program for Threatened and Endangered Fishes of the Colorado River.
USFW Year
1985.
USFW - Doc Type
Logan, Utah.
Copyright Material
NO
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
34
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 />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3-13 <br /> <br />Using the wet method, eggs from ripe females are handstripped into a <br />plastic pan and milt from two or more males is added. The eggs are first <br />sti rred gently with a feather and then "cl ayed" with sl urri ed bentonite <br />foll owi ng fertil i zati on to prevent them from cl umpi ng. The eggs are then <br />poured into floating egg baskets, gently washed to remove the bentonite, and <br />allowed to water harden for 30 minutes. After water hardening, the eggs are <br />enumerated gravimetrically and placed in Heath incubator trays since <br />razorback sucker eggs are too fragile to withstand the roll ing action of <br />incubator jars (Inslee 1981). <br /> <br />The optimum temperature for incubati ng razorback sucker eggs is about <br />70oF. Hatchi ng occurs in 96 to l44 hours with a peak at about 120 hours. <br />The fry can be held in small tanks until swimup and then are reared readily <br />in outdoor earthen rearing ponds. <br /> <br />In 1982, females at Dexter NFH produced an average of 103,746 eggs per <br />fish (Jensen 1983a). In 1983, 46 female razorbacks produced an average of <br />124,522 eggs per fish (Jensen 1984). <br /> <br />Inslee (1981) measured water hardened eggs from five fish with average <br />egg diameters of 0.089 inch and a volumetric displacement of 93,542 per <br />quart. No other volumetric or gravimetric estimates are available for <br />razorback sucker eggs. <br />
The URL can be used to link to this page
Your browser does not support the video tag.