Difference between revisions of "Aggregations Projects"
From Glen Canyon Dam AMP
Cellsworth (Talk | contribs) |
Cellsworth (Talk | contribs) |
||
| Line 32: | Line 32: | ||
adults.” (Valdez and Ryel 1995) | adults.” (Valdez and Ryel 1995) | ||
| − | ==There are | + | ==There are six recognized aggregations below Glen Canyon Dam: [https://pubs.usgs.gov/of/2016/1177/ofr20161177.pdf] == |
| − | *30 Mile | + | *30 Mile (RM 29.8-36.3) |
| − | *Little Colorado River inflow | + | *Little Colorado River inflow (RM 57.0-77.2) |
| − | + | *Shinumo Creek inflow (RM 107.8-110.0) | |
| − | *Shinumo Creek inflow | + | *Middle Granite Gorge (RM 125.0-129.7) |
| − | + | *Havasu Creek inflow (RM 155.8-159.2) | |
| − | *Middle Granite Gorge | + | *Pumpkin Spring (RM 212.5-216.0) |
| − | *Havasu Creek inflow (RM | + | |
| − | *Pumpkin Spring (RM 212.5-216) | + | |
Humpback chub are also caught outside of the aggregations. Samples are also being collected at: | Humpback chub are also caught outside of the aggregations. Samples are also being collected at: | ||
| Line 47: | Line 45: | ||
*Fall Canyon (RM 210-212) | *Fall Canyon (RM 210-212) | ||
*Bridge City (RM 237-244) | *Bridge City (RM 237-244) | ||
| − | *Spencer & Surprise (RM 245-249.5) | + | *Spencer & Surprise (RM 245-249.5) [https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR12_Young.pdf] |
|}<!-- | |}<!-- | ||
Revision as of 13:05, 27 April 2017
 |
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: [1]
Humpback chub are also caught outside of the aggregations. Samples are also being collected at:
|
| -- |
-- |
-- |
|---|
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. [3] [4]   Possible drivers for the increases of humpback chub in Western Grand CanyonImmigration2016 Aggregation sampling
Temperature: consistently >19C in Western Grand Canyon [9]
Local Recruitment2016 System Wide Electrofishing (and hoopnetting)
Below RM 220: 3/146 recaptures (2%)
Translocations: Population may be reaching a critical mass |
|
