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<br />LI 5T OF FI GURE5 <br /> <br />Fiqure Paqe <br />1 The lower San Juan River, with locations of major cities and <br /> <br />town s. . . . . . . . . " . . . . . . . . " . . . . . " . . . . 3 <br /> <br />2 Major tributaries of the San Juan River between Navajo Dam and <br /> <br />lake Powell ."..."...."".........."..". 3 <br /> <br />3 Sample reaches for the main-channel adult fish community <br />monitoring study (top). Detail of Reaches 1-3 showing instream <br />diversion structures (bottom). River miles are given for all <br />diversion structures. Single digit Arabic numerals indicate the <br />location of the structures . . . . . . . . . . . . . . . . . . . . 4 <br /> <br />4 Percent composition of the total catch for the seven most <br />abundant species in 1993 (top) and total number of fish in <br />thousands for the seven most abundant species 1991-1993 (bottom) . 11 <br /> <br />5 Number of fish captured per mile of electrofishing in Reaches 1-6 <br />in 1993. Data for the six most abundant species in each reach <br />are presented. Data for Reach 7 (Mexican Hat to Clay Hills) is <br />on the top of the following page. . . . . . . . .. .... 13 <br /> <br />6 Number of fish per mile of electrofishing in Reaches 1-7 for the <br />six most abundant species collected in 1993. . . . . . . . . . . . 14 <br /> <br />7 Total number (in thousands) of juvenile, and adult fishes weighed <br />and measured for the four most abundant species, 1991-1993, all <br />sampling trips in a year combined. First parenthetic number <br />indicates the total number of individuals characterized. Second <br />parenthetic number indicates percentage of the total catch for a <br />species represented by characterized fish in a given year. . . . . 15 <br /> <br />8 Number in thousands of fish weighed and measured by reach for the <br />four most abundant species, 1991-1993, all sampling trips in a <br />year combined. Numbers above columns indicate percentage of the <br />total number of characterized fish per species for a given year <br />represented by that age class. . . . . . . . . . . . . . .. . 16 <br /> <br />9 Percent composition by age class per reach for flannelmouth <br />sucker and bluehead sucker, 1991-1993, all sampling trips in a <br />year combined. Dashed lines indicate juvenile fish, solid lines <br />indicate adult fish. Circles represent 1991 data, asterisks 1992, <br />and triangles 1993 . . . . . . . . . . . . . . . . . . . . . 17 <br /> <br />10 Mean total length (Tl) in millimeters (mm) for flannelmouth <br />sucker and bluehead sucker, 1991-1993, all sampling trips in a <br />year combined. line and crosses represent mean Tl, asterisks <br />represent standard deviations, and error bars represent the <br /> <br />range. . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 <br /> <br />viii <br /> <br />, <br />t <br />I <br />, <br />I <br />t <br />I <br />, <br />I <br />t <br />, <br />I <br />I <br />,I <br />Ii <br />I <br />I <br />, <br />I <br />