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n <br />' Table 4. Summary of empirical demographic information for the endangered Colorado River fish <br />(modified from Crowl and Bouwes 1997). <br />1 <br />1 <br />1 <br />1 <br /> <br /> <br /> <br /> <br /> <br />d <br />1 <br />1 <br /> <br /> COLORADO <br />SQUAWFISH RAZORBACK <br />SUCKER HUMPBACK <br />CHUB <br />Number of populations 3 3 4 <br />Population size (1) 600-1400 500-1000 600-1000 <br />Sex ratio (M:F) 6:1 1.5:1 - 2.5:1 1:1 <br />Fecundity (eggs/female) 10,000 82,500 2,523-4,831 <br />Life-span (years) 20 3040 20-30 <br />Survival/year <br />egg/larval <br />age 0-1 49-53% 2.5% 100/0 <br />age 1-2 10% <br />age 2-3 10% <br />age 3-4 75.5% <br />adult 81-86% 71% 60% <br />10 <br />F1