Download - November Catfish Update - South Dakota
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James River Catfish Research
Photo Credit: Matt Gade, Mitchell Daily Republic
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Why James River Catfish?
• Strong vocal public interest
• Concerns about overharvest of trophies
• Limited information
• Last studied in 1999-2000
• Future management actions
• Regulations?
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Current Research Goals • Estimate growth
• Accurate estimate of mortality • Using dangler tags to estimate fishing mortality
• 10% = $100 60% = $10 30% = no reward
• Insight into movement • Where were fish tagged and where were they caught?
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Research Area • Began in May 2018
• Sample at multiple sites along the James River
• Yankton to Olivet
• Continue to collect information from tournament caught fish
• Milltown
• Yankton
• Scotland
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Sampling Methods
• Channel Catfish
• Tandem hoop nets - 48 hour sets
• Baited with cheese or soybean cake
Photo Credit: Matt Gade, Mitchell Daily Republic
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Sampling Methods
• Channel Catfish
• Tandem hoop nets - 48 hour sets
• Baited with cheese or soybean cake
• Flathead Catfish
• Low-frequency electrofishing
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Sampling Methods
• Channel Catfish
• Tandem hoop nets - 48 hour sets
• Baited with cheese or soybean cake
• Flathead Catfish
• Low-frequency electrofishing
• Trotlines baited with Black Bullheads
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Length Frequency – Channel Catfish
Total Catch = 852
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Length Frequency – Flathead Catfish
Total Catch = 1,148
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Length Frequency – Flathead Catfish
Total Catch = 1,148
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Channel Catfish
20”
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Channel Catfish
30”
20”
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Channel Catfish
*Z.J. Jackson, M.C. Quist, and J.G. Larscheid. 2008. Growth standards for nine North American fish species. Fisheries Management and Ecology 15:107-118.
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Flathead Catfish
20”
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Flathead Catfish
20”
30”
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Flathead Catfish
*Z.J. Jackson, M.C. Quist, and J.G. Larscheid. 2008. Growth standards for nine North American fish species. Fisheries Management and Ecology 15:107-118.
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Aging
• Total Spine Count • CCF = 382
• FHC = 392
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Tagging
• Total Tag Count
• CCF = 388 tags
• FHC = 567 tags
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Tagging
• Total Tag Count
• CCF = 388 tags
• FHC = 567 tags
• Tag Returns
• CCF = 2 (2 harvested)
• FHC = 11 (3 harvested)
Photo courtesy of Dave Angle
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Fall Flathead Recapture
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Fall Flathead Recapture
36
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Fall Flathead Recapture
36
38
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Fall Flathead Recapture
36
38
81
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Fall Flathead Recapture
36
38
81
23
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Average Recapture =19.5%
5 / 36 ≈ 14%
10 / 38 ≈ 26%
20 / 81 ≈ 25%
3 / 23 ≈ 13%
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Movement
• 104 recaptures
• 100 = Flathead Catfish
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Movement
• 104 recaptures
• 100 = Flathead Catfish
• 98 didn’t move
• 3 moved < 5 miles
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Movement
• 104 recaptures
• 100 = Flathead Catfish
• 98 didn’t move
• 3 moved < 5 miles
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Movement
• 104 recaptures
• 100 = Flathead Catfish
• 98 didn’t move
• 3 moved < 5 miles
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Movement
• 104 recaptures
• 100 = Flathead Catfish
• 98 didn’t move
• 3 moved < 5 miles
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Movement
• 104 recaptures
• 100 = Flathead Catfish
• 98 didn’t move
• 3 moved < 5 miles
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Future Work Plan
• Estimate population size
• Aging Analysis
• Growth curves
• Mortality
• Compare aging methods
• Otoliths vs. Spines – CCF
• Spine preparation methods
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Future Work Plan
• Estimate population size
• Aging Analysis
• Growth curves
• Mortality
• Compare aging methods
• Otoliths vs. Spines – CCF
• Spine preparation methods
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Questions?
Photo Credits: Matt Gade, Mitchell Daily Republic