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The Colorado squawfish was the most uniformly distributed of the <br />rare species and was collected in low numbers in all strata. YOY, <br />juveniles, and adults were collected in all strata. Standardized sam- <br />pling collections indicated strata B, E, and D were more important for <br />young; however, more rigorous fall collections indicated strata E, F, and``--- <br />A contained more YOY and juveniles than the other strata. A total of 47 <br />adult Colorado squawfish were caught within standardized stations, 1979 <br />to 1981. Stratum F contained the largest number of adults (15), followed <br />by E (12), B (8), A (6), D (4), and C (2). <br />Only four razorback suckers were collected during 3 years of stand- <br />ardized sampling, two in stratum F and one each in strata B and E. <br />However, relatively large numbers of razorback suckers were collected in <br />stratum F during special collections (see section on razorback sucker). <br />Nonetheless, this species seems to be quite rare in the Green River. <br />Members of the genus Gila were collected in all strata during stand- <br />ardized sampling. Strata C contained the largest number of Gila spp. <br />Five specimens of humpback chub and one of bonytail chub were collected <br />from this stratum as well as numerous roundtail chub. Gila spp. col- <br />lected from the other strata were considered to be roundtail chubs. A <br />more thorough discussion of the distribution of Gila spp. and their <br />taxonomy is contained in the section on Habitat Preferences and Taxonomy <br />of Gila spp. <br />A measure of fish diversity can be obtained from Figure 11 by divid- <br />ing the total number of fishes collected in a stratum with the number of <br />Figure 11 <br />7000 <br />6500 <br />6000 <br />5500 <br />5000 <br />4500 <br />w 4000 <br />m <br />3500 <br />z <br />c 3000 <br />F <br />2500 <br />2000 <br />1500 <br />1000 <br />500 <br /> _ _ 7547 <br /> <br />N= 19 __- <br /> <br /> <br />-- <br />N=16 N=20 <br /> <br />- - <br />- <br />_-- N=15 '- N=14 N=13 <br /> <br /> <br /> <br /> -= ::::: i <br />Y J A Y J A Y J A Y J A Y J A Y J A <br />SMafum A B C D E - F <br />• Total number of fishes collected during standardized sampling <br />program <br />29