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Last modified
8/11/2009 11:32:58 AM
Creation date
8/10/2009 5:14:48 PM
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UCREFRP
UCREFRP Catalog Number
9713
Author
VanHaverbeke, D.R.
Title
Stock assessment and fisheries monitoring activities in the Little Colorado River within Grand Canyon during 2004.
USFW Year
2005.
USFW - Doc Type
U.S. Fish and Wildlife Service
Copyright Material
NO
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<br />(1,292 fish; 57% of total HBG captured in October; Figure 16). Another group of <br />H BG on both trips fell into the 1 00 to 200 mm size class (1,121 fish; 40% of total <br />HBG captures; modes -130 mm), with no clear distinctions between cohorts. A <br />greater number of HBG ~ 200 mm were captured during the October trip (149 <br />fish; 6% of total HBC captured in October) than during the September trip (74 <br />fish; 3% of total HBC captured in September). Cumulative length frequencies for <br />HBC (Figure 17) show capturing higher proportions of fish < 100 mm at Boulders <br />and Coyote reaches on both trips compared to Salt reach. <br /> <br />Flannelmouth sucker length frequency distributions show that a greater number <br />of fish were captured during the October trip (76 fish; 95% of total flannelmouth <br />sucker captured on both trips) than during the September trip (4 fish; 5% of total <br />flannelmouth sucker captured on both trips); Figure 18). Most flannelmouth <br />sucker were captured in the Boulders reach (Table 11). Thirty-two presumed <br />age-O flannelmouth sucker (TL < 130 mm) were captured in October, and two in <br />September. <br /> <br />Bluehead sucker length frequency distributions were similar to flannelmouth <br />sucker length frequencies in that a greater number of fish were captured during <br />the October trip (158 fish; 86% of total bluehead sucker captured during both <br />trips) than during the September trip (25 fish; 14% of total bluehead sucker <br />captured on both trips; Figure 19). Only 25 presumed age-O bluehead sucker <br />were captured during October and five during September. <br /> <br />Sexual Condition <br /> <br />During the September trip, only two ripe male bluehead suckers were captured <br />(TL = 214 and 245 mm) in Boulders reach. During the October trip, four ripe <br />male HBC (TL range = 200-385 mm) were captured; two in Boulders and two in <br />Salt reach. Three ripe male flannelmouth sucker were captured (TL range = 320 <br />to 490 mm), all in Boulders reach. In addition, 87 ripe bluehead sucker (TL range <br />= 167 to 290 mm) were captured, all but five of them being captured in Boulders <br />reach. Only six of these ripe bluehead were female. Finally, two ripe female <br />speckled dace were captured in October. <br /> <br />Predation <br /> <br />Twenty-one black bullhead and 11 channel catfish were examined for stomach <br />contents during the fall trips. Three of the bullhead (TL range 184 to 227 mm) <br />had a total of six HBC in their stomachs (prey length range 44 to 62 mm). Five <br />others had unidentified fish remains in their stomachs. The remaining bullhead <br />had insects or detritus in their stomachs or had empty stomachs. Two of the <br />channel catfish (TLs = 408 and 205 mm) had unidentified fish remains in their <br />stomachs. The remainder had insects, detritus or empty stomachs. <br /> <br />23 <br />
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