Difference between revisions of "Aggregations Projects"
From Glen Canyon Dam AMP
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==Immigration== | ==Immigration== | ||
| + | '''2016 Aggregation sampling''' <br> | ||
Of 79 recaptures, Havasu & below (2014-2016): | Of 79 recaptures, Havasu & below (2014-2016): | ||
*8 moved down from Havasu (3 Pumpkin; 5 Fern Glen) | *8 moved down from Havasu (3 Pumpkin; 5 Fern Glen) | ||
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==[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]== | ==[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] | + | *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== | ==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 reaching a critical mass== | + | ==[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] | *[http://gcdamp.com/index.php?title=Translocation_Projects Havasu translocations] | ||
Revision as of 11:41, 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.   Immigration2016 Aggregation sampling
Temperature: consistently >19C in Western Grand Canyon [5]
Local Recruitment2016 System Wide Electrofishing (and hoopnetting)
Below RM 220: 3/146 recaptures (2%)
Translocations: Population may be reaching a critical mass |
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