Difference between revisions of "Brown Trout"
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*Why are brown trout increasing in the Lees Ferry reach? | *Why are brown trout increasing in the Lees Ferry reach? | ||
| − | *Has the decrease in the rainbow trout population allowed for increased brown trout spawning in the Lees Ferry reach because of decreased competition for spawning area and decreased egg predation? | + | *Has the decrease in the rainbow trout population allowed for increased brown trout spawning in the Lees Ferry reach because of decreased competition for spawning area and decreased egg predation by rainbow trout? |
| + | *Are increased numbers of brown trout in Lees Ferry a product of higher release temperatures? | ||
*Do fall HFEs clean spawning substrate in the Lees Ferry reach leading to increased the spawning success of brown trout? | *Do fall HFEs clean spawning substrate in the Lees Ferry reach leading to increased the spawning success of brown trout? | ||
*Do fall HFEs increase the upstream migration of brown trout resulting in the increased prevalence of spawning in the Lees Ferry reach? | *Do fall HFEs increase the upstream migration of brown trout resulting in the increased prevalence of spawning in the Lees Ferry reach? | ||
*Could delaying a fall HFE to late November be effective in disrupting the brown trout spawn? | *Could delaying a fall HFE to late November be effective in disrupting the brown trout spawn? | ||
*When do brown trout spawn in Lees Ferry? Ans: Nov-Dec | *When do brown trout spawn in Lees Ferry? Ans: Nov-Dec | ||
| + | *What should we do about more brown trout in the Lees Ferry reach? | ||
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Revision as of 11:10, 7 November 2016
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Brown TroutBrown 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 continue to eat mostly insects and invertebrates even as adults. Many studies have shown that rainbow trout and native fish like humpback chub often have a difficult time persisting with large populations of brown trout.[1] Desired Future Condition for the Lees Ferry Trout FisheryA high quality trout fishery in GCNRA, as further described in the Recreation DFC that does not adversely affect the native aquatic community in GCNP. |
| File:RainbowTrout1.jpg* Rainbow Trout |
File:BrownTrout1.jpg* Brown Trout |
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