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Last modified
8/11/2009 11:07:39 AM
Creation date
8/10/2009 12:37:25 PM
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UCREFRP
UCREFRP Catalog Number
7125
Author
McAda, C. W.
Title
Aspects of the Life History of Three Catostomids Native to the Upper Colorado River Basin.
USFW Year
1977.
USFW - Doc Type
Utah State University,
Copyright Material
YES
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38 <br />fish were collected from different areas during different years and <br />seasons. Sample sizes were small so comparisons by area or year <br />cannot be made. Razorback suckers displayed considerable variability <br />in fecundity which is probably due to the differing stages of maturity <br />of the fish that were examined. Most of the fish examined had been <br />collected in the fall and were not fully mature. Sampling error was <br />minimal (Table 9) and does not account for the variability in <br />fecundity. The relationship was not significant between total lengths <br />or weight and fecundity. In fact, the relation appeared to be random. <br />Fecundity ranged from 27,614 to 76,576 eggs (Table 10). The fish <br />exhibiting the lowest fecundity was larger than the fish with the <br />greatest fecundity, but only contained one-third the number of eggs <br />found in the smaller fish. <br />Table 9. Sampling error in estimating the fecundity of two razorback <br />suckers by a gravimetric method. <br />Total Weight Estimated Actual no. <br />length (mm) (g) no. of eggs of eggs <br />446 1100 44,624 46,084 <br />529 1317 24,490 25,543 <br />Percentage <br />error <br />-3.16 <br />-4.12
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