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Last modified
8/11/2009 11:32:58 AM
Creation date
8/10/2009 5:15:10 PM
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UCREFRP
UCREFRP Catalog Number
9714
Author
Ward, D., and W. Persons.
Title
Little Colorado River fish monitoring 2004 annual report.
USFW Year
2005.
USFW - Doc Type
Arizona Game and Fish Department.
Copyright Material
NO
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<br />6. Queried only data collected during the months of April and May. All years had data . <br />collected during April and May but some years had extensive effort at other times of <br />the year which if included biased CPUE trends. <br /> <br />RESULTS <br /> <br />A total of3,401 fish representing 11 species were captured in the LCR during <br />standardized monitoring in 2004. Native species dominated the catch and comprised 93 % of <br />total fish caught (Table 3). Speckled dace, humpback chub, flannelmouth sucker, and bluehead <br />sucker were the predominant species caught (Table 3 & 4). Catch rates of native fishes were <br />generally not as high as in 2003 but still represented an overall increase since the ~ <br />~~ <br />(Table 5 & 6, Figures 9-10). -r"": J\\ <br />/N~Vr~ ""U <br />The LCR was at or near base flow during the entire 2004 sampling period (approximately <br />.'/ <br />222 cfs, Robinson et al. 1998). Turbidity was also very low during the entire sampling period but <br />decreased overall as thetrip progressed from 29 NTU's at the beginning of the sampling period <br />to less than 6 NTU's at the end (FtgUre~. Water temperature ranged from 15 - 23 oc during the <br />sampling period (Figure 7 & 8). ~ <br />Native species <br />Humpback chub <br />A total of743 humpback chub were collected in standardized hoop net sets during the <br />2004 spring monitoring period. The number of humpback chub caught in 2004 was more than <br />double that of2003 (322) and the highest number recorded since 1992, but most of the fish <br />caught were less than 120 mm TL (Tables 4 & 8). In 2004 less than half as many humpback <br />chub 2: 150 mm TL were caught than in 2003 and there were also one third fewer recaptures. <br />Large chub appeared to be mostly spent adults. <br />We examined 87 humpback chub ~ 150 mm TL for presence of a PIT tag and 34 (39 %) <br />were PIT tag recaptures (Table 4). Four hundred thirty eight humpback chub (<100 mm) were <br />caught; the smallest was 36 mm TL, although most (346) were between 80 and 99 mm. Only <br />two ripe male HBC were found in 2004 and no ripe female chub were collected. Only one <br />Lernea was found on a HBC during the 2004 sampling and no other fish were reported with e)<t-€<f~ <br />parasites. Of the 51 new tags that were inserted only 2 of them were over 250 mm TL indicating <br /> <br />7 <br />
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