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30 " ' <br />p'-.001). Total lengths for females were borderline (Kruskal-Wallis <br />p=.083). This trend in decreasing size indicates possible immigration or <br />movement of different fish into spawning areas during the spawning <br />season. <br />Average weights of razorback suckers also varied during the <br />spawning season (Figs. 9-10). Mean monthly condition factors (Fig. 11) <br />varied in relation to these monthly weight changes. The condition <br />factors of razorbacks decreased for both sexes between January and March <br />1982 (Fig. 11). The variability in condition factors after March 1982 <br />was too high to describe any trends late in the spawning season. <br />Condition factors for both sexes were high again by November 1982. The <br />condition factors of males decreased slightly between November 1982 and <br />February 1983, then dropped off abruptly in March, and increased again <br />by May. <br />The razorback suckers examined from three locations in Lake Mohave <br />and from Senator Wash Reservoir ranged in length from 370-577 mm SL. <br />Mean body depths were very close among the populations examined, with <br />means ranging from 242.9 at Six Mile Coves to 250.3 at Tequila Cove <br />(Fig. 12). Body depths of four razorback X fiannelmouth sucker <br />(Catostomus latipinnis) hybrids from Lake Mohave ranged from 203.7 to <br />208.2. These low depths reflect the reduced keel typical of this hybrid <br />combination. There was no overlap between razorback suckers and the <br />hybrids in body depth, although some individuals from the Arizona Bay <br />population did approach the hybrids. <br />Least depth of the caudal peduncle was similar in all populations. <br />Means ranged from 82.9 at Six Mile Coves to 85.7 in the upper Colorado <br />River system. There was a broad overlap between razorback suckers,