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I I I I I I I I I I I I I I I I I I I LIST OF FIGURES (Continued) Fi qure Paqe 8. Mean catch per effort (fish/10 m2) for post-larval, age-O Colorado squawfish collected by 3-mm-mesh seine from backwaters in 10-mile reaches of the Colorado River, August, September and October, 1984. 23 9. Large and small-scale maps of the Black Rocks study area. Below is a diagrammatic representation of the river profile showing river gradient and mean depth. . 33 10. Frequency distribution of discriminant scores for humpback chub Gila cypha, roundtail chub ~. robusta and unclassified Gila captured at Black Rocks, Colorado River, Colorado, 1983 and 1984. The hexagon and open star immediately below the abscissa designate the centroids of the populations of the two species. 36 11. Seasonal changes in the frequency of occurrence of pectoral-fin tubercles, tubercles on the body of fish, expressable gametes for male and female humpback chub and roundtail chub of mature size collected from the Black Rocks area of the Colorado River, Colorado, 1983. Solid and broken lines connect samples with three or more fish. Numbers near upper margins are sample sizes. . 39 12. Seasonal changes in the frequency of occurrence of pectoral-fin tubercles, tubercles on the body of fish, expressable gametes for male and female humpback chub and roundtail chub of mature size collected from the Black Rocks area of the Colorado River, Colorado, 1984. Solid and broken lines connect samples with three or more fish. Numbers near upper margins are sample sizes. . 40 13. Seasonal changes in the relative body condition, gonadosomatic index (GSI) and the ratio of mean ovum diameter (MOD) to GS1 for male and female humpback chub and roundtail chub of mature size collected from the Black Rocks area of the Colorado River, Colorado, 1983. Solid and broken lines connect mean values of samples with three or more fish. Numbers designate multiple observations. 43 14. Seasonal changes in the relative body condition, gonadosomatic index (GS1) and the ratio of mean ovum diameter (MOD) to GS1 for male and female humpback chub and roundtail chub of mature size collected from the Black Rocks area of the Colorado River, Colorado, 1984. Solid and broken lines connect mean values of samples with three or more fish. Numbers within graphs indicate multiple observations; numbers near upper margins are sample sizes. 44 15. Discharge, maximum water temperatures and estimated spawning times (::::::::::::::) of humpback chub and roundtail chub collected in the Black Rocks area of the Colorado River, Colorado, 1983 and 1984. 47 vii