View source for Aggregations Projects


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[[File:2016-03-08 14-21-00 pirated.jpg|center|300px‎]]

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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 six recognized aggregations below Glen Canyon Dam: [https://pubs.usgs.gov/of/2016/1177/ofr20161177.pdf] ==
*30 Mile (RM 29.8-36.3)
*Little Colorado River inflow (RM 57.0-77.2)
*Shinumo Creek inflow (RM 107.8-110.0)
*Middle Granite Gorge (RM 125.0-129.7)
*Havasu Creek inflow (RM 155.8-159.2)
*Pumpkin Spring (RM 212.5-216.0)

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) [https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR12_Young.pdf] 

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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>
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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. [https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR12_Young.pdf] [https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR21_Rogowski.pdf] ==

[[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] 

=Possible drivers for the increases of humpback chub in Western Grand Canyon=

==Immigration==
'''2016 Aggregation sampling''' <br>
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 other native fish like [http://gcdamp.com/index.php?title=FISH flannelmouth sucker] [https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR12_Young.pdf]

==Local Recruitment==
'''2016 System Wide Electrofishing (and hoopnetting)''' <br>
Above RM 220: 21/37 recaptures (57%)
*At Little Colorado River confluence ~80% recaptures
Below RM 220: 3/146 recaptures (2%)
*3 were tagged recently and at RM 238-239 [https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR21_Rogowski.pdf]

==[http://gcdamp.com/index.php?title=Translocation_Projects Translocations:] Population may be reaching a critical mass==
*[http://gcdamp.com/index.php?title=Translocation_Projects Havasu translocations]

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[http://gcdamp.com/index.php?title=Humpback_Chub_Page The Humpback Chub Page]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Projects</h2>
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*'''Aggregation Sampling:''' Electrofishing at the 6 aggregation sites specified above since 2010. 1 trip/year (reduced from two trips/year in FY13-14). Lead by USFWS.
*'''System Wide Electrofishing:''' Collect longterm monitoring data of native and nonnative fish outside of the LCR/NO reaches. 3 trips: 2 spring/summer, 1 in fall since 2000. Near shore electrofishing. New in 2016: Baited hoop nets and extended below Diamond to Pierce. Lead by AZDGF.
*'''Otolith Microchemistry:''' Determine sources of humpback chub recruitment.
*'''Portable PIT-tag antennas:''' Locate additional aggregations.

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Presentations and Papers</h2>
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'''2019'''
*[[Media:Aggregation Report 2018 FINAL.pdf| Monitoring Humpback Chub Aggregations in the Colorado River, Grand Canyon during fall 2018]]

'''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://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.]

'''2016'''
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/16jan26/documents/AR25_Young.pdf Monitoring Humpback Chub Aggregations in the Mainstem, 1991-2015]

'''2015'''
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15jan20/Attach_13.pdf Humpback Chub in the Colorado river: Status and Trends of Aggregations, Changes in Range]

'''2014'''
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/14jan30/AR_Persons_Fish_monitoring.pdf Colorado River fish monitoring in Grand Canyon, Arizona: 1990-2013 humpback chub, Gila cypha, aggregations]

'''2013'''
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/13jan24/2_Persons.pdf Colorado River Fish Monitoring in Grand Canyon, Arizona: 2002-2012 HBC]

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