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Marine FisheriesAndrew Cathey | November 18, 2021
Exploring the Potential of Citizen Science “Catch U Later” Smartphone Application Update
DEPARTMENT OF ENVIRONMENTAL QUALITY
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MRIP and Southern Flounder
Department of Environmental Quality
• Harvest Estimates are precise
• Discard Estimates areseverely limited
Field Staff do not physically see discarded catch
Discarded flounder are recorded to the genus level
No Biological Data: Length/Weight
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Catch U Later Research Objectives
Department of Environmental Quality
1. What are the species specific contributions to generic flounder discards?
Benefit: Accurately classify generic discards
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Catch U Later Research Objectives
Department of Environmental Quality
2. What is the species specific length distribution of discarded flounder?
Benefit: Evaluation of catch at size
?
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Num
bers
of F
ish
Total Length inches
2020 Southern Flounder Weighted Length Frequency
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Catch U Later Research Objectives
3. Can anglers tell the difference between North Carolina’s Flounder species?
Benefit: Evaluate the feasibility of single species management
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Progress to Date: App Development
Department of Environmental Quality
Launched Application August 23, 2021
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Progress to Date: App Development
Department of Environmental Quality
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Preliminary Data: Sampling Representation
0
20
40
60
80
100
120
T UT T T UT THIGH LOW HIGH LOWNon-Coastal Coastal
Num
ber o
f Rec
ords
Data Records by Sampling Strata
T =TrainedUT =Untrained
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Preliminary Data: Unusable Records
Of 288 records submitted26 or (11%) could not be useddue to a lack of picture or unusable picture
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Preliminary Data: Species Specific Discard Contributions
Observed from Catch U Later
Estimated fromMRIP Harvest Ratios
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Preliminary Data: Species Specific Discard Length Frequency
0
5
10
15
20
25
30
35
4 6 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Num
ber o
f Fis
h
Total Length Inches
Length Distribution FLOUNDER, GULFFLOUNDER, SOUTHERNFLOUNDER, SUMMER
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Preliminary Data: Can Anglers Identify Flounder to Species?
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
No Yes No Yes No YesFLOUNDER, GULF FLOUNDER, SOUTHERN FLOUNDER, SUMMER
Perc
enta
ge
Correct Identification by Species
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Questions, Comments, Concerns
