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Annual and seasonal changes in fish presence in the lower Penobscot River 2010-2013. Garrett Staines and Gayle Zydlewski University of Maine, School of Marine Sciences. Open Rivers Initiative. Acknowledgements: Patrick Erbland data collection Megan Altenritter fieldwork - PowerPoint PPT Presentation
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Annual and seasonal changes in fish presence in the lower Penobscot River 2010-2013
Acknowledgements: Patrick Erbland data collectionMegan Altenritter fieldworkRachel Kocik data processingHaixue Shen data processing
Garrett Staines and Gayle ZydlewskiUniversity of Maine, School of Marine Sciences
Open Rivers Initiative
Objective
Create metric for seasonal and annual comparisons
Fisheries AcousticsNon-invasive with large spatial and temporal coverage
Some examples:• Roanoke River; American shad and striped bass (Hightower)• Kenai River; Chinook and sockeye salmon (Burwen)• Chandalar River; chum salmon (Daum)
And the Penobscot
et al.
Split-beam Echosounders
“Fish tracks” for quantification
transducer
sound beam
Study Area
Veazie Dam Site
Verona Island
Hampden Brewer
Study Site
Sample Site Cross Section Coverage
Cianbro Side Waterfront Side
180 m wide x 10 m deep 3 meter tidal flux
Mean Low-tide
East West
Data Collected
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
2010
2011
2012
2013
Waterfront
Cianbro
Waterfront
Cianbro
Waterfront
Cianbro
Waterfront
Cianbro
*some gaps from equipment malfunction
Current data subset
• One side, limited sampling range, certain tidal and diel
• Eight 15 minute files per month
• Visual counts with subsamples; compare with tracking
• Try several fish tracking parameters; choose best by year
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
2010
2011
2012
2013
Waterfront
Cianbro
Waterfront
Cianbro
Waterfront
Cianbro
Waterfront
Cianbro
15 m
Sub-set
Cianbro, night, high slack tide only
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
2010
2011
2012
2013
Waterfront
Cianbro
Waterfront
Cianbro
Waterfront
Cianbro
Waterfront
Cianbro
Full Data Set
~80 m
Current data subset
• Cianbro side with first 15 m range, night high slack tide
• Eight 15 min files per month; May-Oct; 2010-2013
• Visual counts with subsamples; compare with tracking
• Try several fish tracking parameters; choose best by year
Visual Handcount Fish Tracks
Automated “Fish Tracks”
Current data subset
• Cianbro side with first 15 m range, night high slack tide
• Eight 15 min files per month; May-Oct; 2010-2013
• Visual counts with subsamples; compare with tracking
• Try several fish tracking parameters; choose best by year
Handcounts Compared to “Fish Tracks”
0 50 100 150 200 2500
50
100
150
200
250
f(x) = 0.998372523710646 xR² = 0.632786347328359
Hand Counts
Fish
Tra
cks
0 40 80 120 1600
40
80
120
160
f(x) = 0.639107132835737 xR² = 0.648748712498136
Hand Counts
Fish
Tra
cks
0 40 80 120 1600
40
80
120
160
f(x) = 1.29009764857736 xR² = 0.833942700032577
Hand Counts
Fish
Tra
cks
0 200 400 600 8000
200
400
600
800
f(x) = 2.30930467478534 xR² = 0.338870764179595
Hand Counts
Fish
Tra
cks
1 2
3 4
Handcounts vs. “Fish Tracks” for Each Year
0 100 200 300 400 500 6000
100
200
300
400
500
600
f(x) = 0.664751538740043 xR² = 0.726813489084873
2011
Hand Counts
Fish
Tra
cks
0 50 100 150 200 2500
50
100
150
200
250
f(x) = 0.859140401146132 xR² = 0.718789737005626
2012
Hand Counts
Fish
Tra
cks
0 50 100 150 200 2500
50
100
150
200
250
f(x) = 0.753960058451047 xR² = 0.907263062569642
2013
Hand Counts
Fish
Tra
cks
0 50 100 150 200 2500
50
100
150
200
250
f(x) = 0.998372523710646 xR² = 0.632786347328359
2010
Hand Counts
Fish
Tra
cks
Date
Fish
Den
sity
Gaug
e He
ight
(m)
0.0
20.0
40.0
60.0
0.0
5.0
10.0
15.02010 Den
sity
0.0
20.0
40.0
60.0
0.0
5.0
10.0
15.02011 Den
sityGauge
0.0
20.0
40.0
60.0
0.0
5.0
10.0
15.02012 Den
sityGauge
0.0
20.0
40.0
60.0
0.0
5.0
10.0
15.02013 Den
sityGauge
May Jun Jul Aug Sep Oct Nov
Month
Fish
Den
sity
0.0
10.0
20.0
30.02011
0.0
10.0
20.0
30.02012
0.0
10.0
20.0
30.0
2013
*
0.0
10.0
20.0
30.0
2010
*
May Jun Jul Aug Sep Oct
Summary: Biological Implications
•Peak in May (except 2010; start of gear deployment)
•Decrease in density through summer
•Density spike at beginning of Fall (except 2013; gear malfunctions)
•Daily/weekly increases in density follow increases in gauge height
•Used as baseline for dam removal
Thoughts/Questions: Biological Implications
Future
•Continued sampling
•Additional subsets of ebbing and flooding tides
•Additional range added to analysis
•Minimum subset requirements for acceptable precision*doubled sub-sample in 2010
