Difference between revisions of "Smallmouth Bass Page"
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The NPS encourages anglers to report any observations or catches of smallmouth bass below the dam. If caught, please remove the fish, put on ice and contact staff at Glen Canyon National Recreation Area or Grand Canyon National Park with a description of the location where found. Report findings to: Jeff Arnold, Glen Canyon National Recreation Area, e-mail us or Brian Healy, Grand Canyon National Park, e-mail us. [https://www.nps.gov/grca/learn/news/invasive-smallmouth-bass-colorado-river-below-glen-canyon-dam.htm] | The NPS encourages anglers to report any observations or catches of smallmouth bass below the dam. If caught, please remove the fish, put on ice and contact staff at Glen Canyon National Recreation Area or Grand Canyon National Park with a description of the location where found. Report findings to: Jeff Arnold, Glen Canyon National Recreation Area, e-mail us or Brian Healy, Grand Canyon National Park, e-mail us. [https://www.nps.gov/grca/learn/news/invasive-smallmouth-bass-colorado-river-below-glen-canyon-dam.htm] | ||
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+ | The lower slough was treated with rotenone on September 17-19, 2022. | ||
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Nest building and spawning occur when the water temperature is | Nest building and spawning occur when the water temperature is | ||
12.8-21.0° C, but most activity occurs at or above 15° C. [https://apps.dtic.mil/sti/pdfs/ADA323294.pdf] | 12.8-21.0° C, but most activity occurs at or above 15° C. [https://apps.dtic.mil/sti/pdfs/ADA323294.pdf] | ||
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+ | Mature females may contain 2000-15,000 golden yellow eggs. Males may spawn with several females on a single nest. On average each nest contains about 2,500 eggs, but nests may contain as many as 10,000 eggs. Eggs hatch in about 10 days if water temperatures are in the mid-50's (°F), but can hatch in 2-3 days if temperatures are in the mid-70's (°F). Males guard the nest from the time eggs are laid until fry begin to disperse, a period of up to a month. [https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fsbdev3_018493.pdf] | ||
'''Food: '''The diet of smallmouth bass changes from small to large food items as the | '''Food: '''The diet of smallmouth bass changes from small to large food items as the | ||
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+ | *[https://qcnr.usu.edu/coloradoriver/files/research/2024-SMB-Report-3.pdf Review of Smallmouth Bass Management in the Colorado River Ecosystem] | ||
*[https://www.usbr.gov/uc/DocLibrary/EnvironmentalAssessments/20230200-GCDSmallmouthBassFlowOps_Draft%20EA_508.pdf 2023 Glen Canyon Dam/ Smallmouth Bass Flow Options Draft Environmental Assessment] | *[https://www.usbr.gov/uc/DocLibrary/EnvironmentalAssessments/20230200-GCDSmallmouthBassFlowOps_Draft%20EA_508.pdf 2023 Glen Canyon Dam/ Smallmouth Bass Flow Options Draft Environmental Assessment] | ||
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*[https://www.usbr.gov/uc/progact/amp/amwg/2023-02-16-amwg-meeting/20230216-InvasiveFishSpeciesBelowGlenCanyonDam-508-UCRO.pdf 2023 Invasive Fish Species Below Glen Canyon Dam: A Strategic Plan to Prevent, Detect and Respond] | *[https://www.usbr.gov/uc/progact/amp/amwg/2023-02-16-amwg-meeting/20230216-InvasiveFishSpeciesBelowGlenCanyonDam-508-UCRO.pdf 2023 Invasive Fish Species Below Glen Canyon Dam: A Strategic Plan to Prevent, Detect and Respond] | ||
*[http://gcdamp.com/index.php?title=National_Park_Service_Expanded_Non-native_Aquatic_Species_Management_Plan_and_EA 2019 National Park Service Expanded Non-native Aquatic Species Management Plan] | *[http://gcdamp.com/index.php?title=National_Park_Service_Expanded_Non-native_Aquatic_Species_Management_Plan_and_EA 2019 National Park Service Expanded Non-native Aquatic Species Management Plan] | ||
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Latest revision as of 15:08, 29 May 2024
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Smallmouth Bass (Micropterus dolomieui)The predatory threat of invasive and large-bodied piscivorous taxa such as smallmouth bass in the upper Colorado River basin is substantial. For example, based on results of a bioenergetics model, Johnson et al. (2008) ranked smallmouth bass as the most problematic invasive species because of their high abundance, habitat use that overlaps with most native fishes, and ability to consume a wide variety of life stages of native fishes (Bestgen et al. 2008). Expanded populations of piscivores such as smallmouth bass are a major impediment to conservation actions aimed at recovery efforts for the four endangered fishes in the upper Colorado River basin (U.S. Fish and Wildlife Service 2002a, b, c, d). [1] |
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