Difference between revisions of "Brown Trout"

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==[http://www.azgfd.gov/h_f/fish_brown_trout.shtml Brown Trout]==
 
==[http://www.azgfd.gov/h_f/fish_brown_trout.shtml Brown Trout]==
  
Brown trout are native to Europe and were introduce to tributaries in the Grand Canyon in the 1920s. They are capable of withstanding slightly higher temperature than other trout. Unlike most other trout species, brown trout spawn in the late fall. Their spawning behavior, however, is similar to other trout species.  Like rainbow trout, young brown trout feed on aquatic and terrestrial insects and invertebrates but brown trout are more apt to switch to larger prey like fish as they get bigger than the rainbow trout found in Grand Canyon. Many studies have shown that native fish often have a difficult time persisting with large populations of brown trout.[https://ojs.lib.byu.edu/spc/index.php/wnan/article/download/28197/26660 ]   
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Brown trout are native to Europe and were introduce to tributaries in the Grand Canyon in the 1920s. They are capable of withstanding slightly higher temperature than other trout. Unlike most other trout species, brown trout spawn in the late fall. Their spawning behavior, however, is similar to other trout species.  Like rainbow trout, young brown trout feed on aquatic and terrestrial insects and invertebrates but brown trout are more apt to switch to eating other fish as they get bigger. The rainbow trout found in Grand Canyon are more likely to eat mostly insects and invertebrates even as adults. Many studies have shown that native fish often have a difficult time persisting with large populations of brown trout.[https://ojs.lib.byu.edu/spc/index.php/wnan/article/download/28197/26660 ]   
  
 
==[[Portal:Desired Future Conditions -DFCs| '''Desired Future Condition for the Lees Ferry Trout Fishery''']]==
 
==[[Portal:Desired Future Conditions -DFCs| '''Desired Future Condition for the Lees Ferry Trout Fishery''']]==

Revision as of 12:02, 20 October 2016


BrownTrout LCR NO 2013.JPG Brown trout caught at the LCR during 2013 summer Natal Origins trip

Brown Trout

Brown trout are native to Europe and were introduce to tributaries in the Grand Canyon in the 1920s. They are capable of withstanding slightly higher temperature than other trout. Unlike most other trout species, brown trout spawn in the late fall. Their spawning behavior, however, is similar to other trout species. Like rainbow trout, young brown trout feed on aquatic and terrestrial insects and invertebrates but brown trout are more apt to switch to eating other fish as they get bigger. The rainbow trout found in Grand Canyon are more likely to eat mostly insects and invertebrates even as adults. Many studies have shown that native fish often have a difficult time persisting with large populations of brown trout.[1]

Desired Future Condition for the Lees Ferry Trout Fishery

A high quality trout fishery in GCNRA, as further described in the Recreation DFC that does not adversely affect the native aquatic community in GCNP.
• Minimize emigration of non-native fish from the Lees Ferry reach in Glen Canyon National Recreation Area to downstream locations.
• Minimize emigration of non-native warm water fish to the mainstem Colorado River.

RainbowTrout1.jpg
Rainbow Trout
BrownTrout1.jpg
Brown Trout

Updates

BrownTroutLeesFerry.jpg
BrownTroutLeesFerry2.jpg

Brown trout numbers during AZGFD monitoring in the Lees Ferry reach. AZGFD identifies that the increase in brown trout numbers may be related to the recent fall HFEs.


RBT BT piscivory.jpg

Trout piscivory in the Colorado River, Grand Canyon: Effects of turbidity, temperature, and fish prey availability

Information and Links

Questions

  • Why are brown trout increasing in the Lees Ferry reach?
  • When do brown trout spawn in Lees Ferry?
  • Could delaying a fall HFE be effective in disrupting the brown trout spawn?

Presentations and Papers

2016

2013

2011

Other Stuff