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Last modified
7/14/2009 5:02:32 PM
Creation date
5/20/2009 10:54:46 AM
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UCREFRP
UCREFRP Catalog Number
8033
Author
Lentsch, L. D., et al.
Title
Endangered Fish Interim Management Objectives for the Upper Colorado River Basin Recovery And Implementation Program -Final Report.
USFW Year
1998.
USFW - Doc Type
55,
Copyright Material
NO
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n <br />Table 2. Species, sex ratio (during spawning: males : females), reference source and associated <br />comments for selected fish species. <br />t <br />CJ <br /> <br /> <br />1 <br />1 <br />1 <br />F <br /> <br /> <br /> <br /> <br />f <br />I <br />SPECIES SEX RATIO SOURCE COMMENTS <br />Colorado Squawfish 9 : 1 Holden and Stalnaker 1975 <br />Colorado Squawfrsh 8-10: fewer females Miller et al. 1982 actual sex ratio not reported <br />Colorado Squawfish 2 : 1 Hamman 1980 artificially spawned in <br /> Willow Beach Hatchery <br />Colorado Squawfish 13.85:1 Tyus 1990 <br />Colorado Squawfish 5.6:1 Seethaler 1978 <br />Colorado Squawfish 2-3 : 1 Hamman 1986 artificially spawned <br /> 57.3% of eggs viable <br /> 31% survived to fry <br />Colorado Squawfish 2-3 : 1 Hamman 1981 natural spawn in a raceway <br /> spawned more than one <br /> time with possibly more <br /> than 2 or 3 different males <br />Northern Squawfish I+ A 1 McPhail and Lindsey 1970 more than one male <br /> spawned with any one <br /> female <br />Northern Squawfish 50-200: 1 Patten and Rodman 1969 -spawning ground sex ratio <br /> -actual spawning <br /> 1-6:1 observation 1-6 males <br /> spawned with 1 female <br /> -females and males both <br /> spawned more than one <br /> time <br />Northern Squawfish 1+: 1 Casey 1962 -each female attended by <br /> one or more males <br />Northern Squawfish 50-100:1 Beamesderfer 1992 -spawning ground sex ratio <br /> -multiple matings of both <br />- sexes with many different <br /> individuals of opposite sex <br /> -suggests female choice and <br /> male competition by speed <br /> of swimming and ability to <br /> keep up with female <br />Northern Pike 2-3 : 1 Craig 1996 -spawning ground sex ratio <br /> -also 2-3 males spawned <br /> with any one female <br /> -900/ofertilization <br />Northern Pike 3-6:1 Kozmin 1980 <br />Northern Pike 3.56:1 Harrison and Hadley 1983 <br />Razorback Sucker 1.61:1 Tyus 1987 <br />6 <br />
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