Difference between revisions of "Aggregations Projects"
From Glen Canyon Dam AMP
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| + | == Aggregation: == | ||
| + | “A consistent and disjunct group of fish with no | ||
| + | significant exchange of individuals with other | ||
| + | aggregations, as indicated by recapture of PIT‐tagged | ||
| + | juveniles and adults and movement of radio‐tagged | ||
| + | adults.” (Valdez and Ryel 1995) | ||
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| + | ==There are eight recognized aggregations below Glen Canyon Dam:== | ||
| + | *30 Mile | ||
| + | *Little Colorado River inflow | ||
| + | *Bright Angel Creek inflow | ||
| + | *Shinumo Creek inflow | ||
| + | *Stephen Aisle | ||
| + | *Middle Granite Gorge | ||
| + | *Havasu Creek inflow (RM 157-160) | ||
| + | *Pumpkin Spring (RM 212.5-216) | ||
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| + | Humpback chub are also caught outside of the aggregations. Samples are also being collected at: | ||
| + | *Fern Glen - Stairway (RM 168.5-172.9) | ||
| + | *Froggy Fault (RM 196-198.5) | ||
| + | *Fall Canyon (RM 210-212) | ||
| + | *Bridge City (RM 237-244) | ||
| + | *Spencer & Surprise (RM 245-249.5) | ||
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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;">Updates</h2> | ! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;">Updates</h2> | ||
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| + | =There have been substantial increases in the captures of humpback chub in aggregation sampling since 2014, particularly at the LCR, Havasu, Pumpkin Spring, and in Western Grand Canyon. = | ||
| + | [[Image:AggregationsCPUE.jpg|center|600px]] [https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR12_Young.pdf] | ||
| − | | | + | [[Image:WGC CPUE.jpg|center|600px]] [https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR12_Young.pdf] |
| + | |||
| + | [[Image:SWEF hoopnetting.jpg|center|600px]] [https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR21_Rogowski.pdf] | ||
| + | |||
| + | ==Immigration== | ||
| + | Of 79 recaptures, Havasu & below (2014-2016): | ||
| + | *8 moved down from Havasu (3 Pumpkin; 5 Fern Glen) | ||
| + | *5 moved up from Pumpkin (3 Froggy; 2 Fall Canyon) [https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR12_Young.pdf] | ||
| + | |||
| + | ==[http://gcdamp.com/index.php?title=TEMPERATURE Temperature:] consistently >19C in Western Grand Canyon [https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR12_Young.pdf]== | ||
| + | *Humpback chub increases coincide with increases of [http://gcdamp.com/index.php?title=FISH flannelmouth sucker] [https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR12_Young.pdf] | ||
| + | |||
| + | ==Local Recruitment== | ||
| + | |||
| + | ==[http://gcdamp.com/index.php?title=Translocation_Projects Translocations:] Population reaching a critical mass== | ||
| + | *[http://gcdamp.com/index.php?title=Translocation_Projects Havasu translocations] | ||
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| − | + | *System Wide Electrofishing: 3 trips: 2 spring/summer, 1 in fall. Boat Electrofishing – near shore. Baited hoop nets and extended below Diamond to Pierce (new in 2016) | |
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'''2017''' | '''2017''' | ||
| + | *[https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR21_Rogowski.pdf System Wide Monitoring PPT] | ||
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR12_Young.pdf Humpback Chub Aggregations ] | *[https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR12_Young.pdf Humpback Chub Aggregations ] | ||
*[https://doi.org/10.3133/ofr20161177 Persons et al. 2017. Colorado River fish monitoring in Grand Canyon, Arizona; 2002–14 humpback chub aggregations: U.S. Geological Survey Open-File Report 2016–1177, 43 p.] | *[https://doi.org/10.3133/ofr20161177 Persons et al. 2017. Colorado River fish monitoring in Grand Canyon, Arizona; 2002–14 humpback chub aggregations: U.S. Geological Survey Open-File Report 2016–1177, 43 p.] | ||
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Revision as of 12:35, 27 April 2017
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Aggregation:“A consistent and disjunct group of fish with no significant exchange of individuals with other aggregations, as indicated by recapture of PIT‐tagged juveniles and adults and movement of radio‐tagged adults.” (Valdez and Ryel 1995) There are eight recognized aggregations below Glen Canyon Dam:
Humpback chub are also caught outside of the aggregations. Samples are also being collected at:
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There have been substantial increases in the captures of humpback chub in aggregation sampling since 2014, particularly at the LCR, Havasu, Pumpkin Spring, and in Western Grand Canyon.   ImmigrationOf 79 recaptures, Havasu & below (2014-2016):
Temperature: consistently >19C in Western Grand Canyon [5]
Local RecruitmentTranslocations: Population reaching a critical mass |
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