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Last modified
8/11/2009 11:32:57 AM
Creation date
8/10/2009 4:28:24 PM
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UCREFRP
UCREFRP Catalog Number
7953
Author
Miller, W. H., et al.
Title
Colorado River Fisheries Investigations, 1979 Progress Report - Draft,.
USFW Year
1980.
USFW - Doc Type
(submitted in partial fulfillment of Contract No. 9-07-40l-1016 with the Water and Power Resources Service),
Copyright Material
NO
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<br />another source of experimental fish. <br />to be 50,000 of each species per year. <br />The demand for test fish is expected <br />About twice this number of eggs <br />should be collected for this purpose. While a single squawfish conceivably <br />could produce 100,000 eggs, several large humpbacks would be needed to <br />produce that many. <br />Spawning these fish by hand with hormonal injections will be necessary. <br />Preliminary tests on the use of various hormones on Northern squawfish <br />are planned by the University of Idaho, followed by tests on Colorado <br />squawfish at Logan and culminating with the broodstock at Willow Beach. <br />These tests are scheduled for May - June in Idaho, June - July at Logan, <br />and in,'July at Willow Beach. <br />Spawning requirements for the humpback chubs are not known and the <br />injection of carp pituitary last year had detrimental effect on these <br />fish. If they do not spawn-naturally in prepared raceways this-year <br />hormone injection will be tried before the middle of May- . We are.hoping <br />to be able to hand strip the eggs for ease of handling and hatching. The <br />Colorado and the Little Colorado River humpback chubs are being held <br />separately. Both groups should begin spawning in May or June and are <br />showing spawning colors at the present time. <br />Data gathered on natural spawning will consist of continuous temperature <br />recordings, depth and type of substrate utilized, date, time of day and <br />observation of spawning behavior. A photographic record of-male and <br />female fish will be made with close up pictures of the genital area, and <br />head, etc. to help in developing a method of sexing both squawfish and <br />chubs. Egg and fry development will be recorded photographically
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