preserving a potential state record fish€¦ · 4/2/2020 · preserving a potential state record...
TRANSCRIPT
![Page 1: Preserving a Potential State Record Fish€¦ · 4/2/2020 · Preserving a Potential State Record Fish Hunter Hatcher1, Andy Strickland 2, and Scott Bisping 1. Virginia Department](https://reader034.vdocuments.site/reader034/viewer/2022052012/6028d8c2eedbc04b717df715/html5/thumbnails/1.jpg)
Preserving a Potential State Record Fish
Hunter Hatcher1, Andy Strickland2, and Scott Bisping2
1. Virginia Department of Game and Inland Fisheries
2. Florida Fish and Wildlife Conservation Commission
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Missing out on a milestone
• Effort focused on weekends
• Delay in certification
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Missing out on a milestone
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Missing out on a milestone
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Missing out on a milestone
3. If possible, keep the fish alive. If not possible to keep
the fish alive, place it in ice water. Avoid freezing the
fish, because it will dehydrate causing it to lose weight.
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Objective
Identify the best handling practices to minimize change in weight post-catch in four fish species.
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Which Species?
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Which Species?
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Which Species?
≥9”≥12”
≥28” ≥18”
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Which Species?
≥28”
≥18”
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Treatments
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Treatments
• Live
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Treatments
• Live
• Ice-bath
• Ice
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Treatments
• Live
• Ice-bath
• Ice
• Frozen – 24 hr• 6 hr thaw
• Frozen – 48 hr• 6 hr thaw
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Experimental Design
• ≥10 replicates per treatment
• 4 replicates per treatment per trial
• 3 trials per species
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Fish Collections
•Boat Electrofishing
• Transported alive
• Fish weighed and measured
• Treatment assigned
•Weighed at 6, 12, 24, & 48 hours
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Data Analysis• Proportion change in weight – arcsine transformed
• Analysis of Variance (ANOVA)• 24 and 48 hours
• Live, Ice, Ice-bath, Frozen, and Thaw
• Tukey Honest Significant Difference (HSD)
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Data Analysis•Proportion change in weight – arcsine transformed
•Repeated Measures ANOVA• All time intervals• Live, Ice, and Ice-bath
•Contrast Analysis
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Data Analysis• Analysis of Variance (ANOVA)
• Tukey Honest Significant Difference (HSD)
• Repeated Measures ANOVA• Contrast Analysis
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Data Analysis• Analysis of Variance (ANOVA)
• Tukey Honest Significant Difference (HSD)
• Repeated Measures ANOVA• Contrast Analysis
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24 hours – ANOVA & Tukey HSD
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24 hours – ANOVA & Tukey HSD
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24 hours – ANOVA & Tukey HSD
A
D
B
CBC
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24 hours – ANOVA & Tukey HSD
A
D
B
CBC
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How big was the current state record?
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How big was the current state record?
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How big was the current state record?
Held in Ice-Bath 66.5 lbs
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How big was the current state record?
Held in Ice-Bath 66.5 lbs
Held alive66.9 lbs
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48 hours – ANOVA & Tukey HSD
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48 hours – ANOVA & Tukey HSD
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48 hours – ANOVA & Tukey HSD
B
B B
C
A
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48 hours – ANOVA & Tukey HSD
B
B B
C
A
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How big was the current state record?
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How big was the current state record?
Held in Ice-Bath 64.5 lbs
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How big was the current state record?
Held in Ice-Bath 64.5 lbs
Held alive67.4 lbs
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≥18”
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24 hour – ANOVA & Tukey HSD
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24 hour – ANOVA & Tukey HSD
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24 hour – ANOVA & Tukey HSD
AB B
C
AAB
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24 hour – ANOVA & Tukey HSD
AB B
C
AAB
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How big was the current state record?
16 lbs 4 ozsLake Conner1985
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How big was the current state record?
16 lbs 2 ozsBriery Creek Lake2003
16 lbs 4 ozsLake Conner1985
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How big was the current state record?
• 16 lbs 4 ozs
16 lbs 2 ozsBriery Creek Lake2003
16 lbs 4 ozsLake Conner1985
Held in Ice-Bath16 lbs 10 ozs
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48 hour – ANOVA & Tukey HSD
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48 hour – ANOVA & Tukey HSD
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48 hour – ANOVA & Tukey HSD
ABAB
B
C
A
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48 hour – ANOVA & Tukey HSD
ABAB
B
C
A
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How big was the current state record?
16 lbs 2 ozsBriery Creek Lake2003
16 lbs 4 ozsLake Conner1985
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How big was the current state record?
16 lbs 2 ozsBriery Creek Lake2003
16 lbs 4 ozsLake Conner1985
Held in Ice-Bath16 lbs 15 ozs
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ConclusionsA
A
AA
B
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ConclusionsA
A
AA
B
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ConclusionsA
A
AA
B
A
A
AA
B
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Conclusions
•Handling method impacts change in weight
•Not all species respond the same
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Management Implications
• Evaluation of handling methods
•Revisions to suggested handling methods
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Taking Action
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Thank You
• Andy Strickland
• Scott Bisping
• Ryan Henry
• Bill Sagues
• Jacob Gehres
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QUESTIONS?
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Breaking the LMB State Record
•16 lbs 4 ozs
• Ice Bath• Average weight gain at 48 hours: 4.9%
• 16 lbs 4 ozs x 0.951 = 15 lbs 7 ozs
• Max observed weight gain at 48 hours: 8%• 16lbs 4 ozs x 0.92 = 14 lbs 15 ozs
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Mean Water Temperature
Black Crappie: 16.43° C or 61.57° F
Flathead Catfish: 25.32° C or 77.58° F
Flathead Catfish Cooled: 17.81° C or 64.06° F