study area: eastern us continental shelfarchive.nefmc.org/herring/cte mtg docs/100727-28...atlantic...

ATLANTIC HERRING PDTJamie M. Cournane, PhD

University of New Hampshire and Environmental Defense Fund

Steven CorreiaMassachusetts

Division of Marine Fisheries

NRC, UMASS Amherst

NEFMC Atlantic Herring Oversight Committee MeetingJuly 28, 2010 in Portland, ME

Outline

Images from: http://mapping2.orr.noaa.gov/portal/Delaware/lifehistory.html

http://pond.dnr.cornell.edu/nyfish/clupeidae/alewife.html

Alewife Blueback herring

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NEFMC Atlantic Herring Committee Motion on May 17, 2010: Identification of river herring bycatch hotspots

Fishing effort and river herring bycatch

Trips (VTR)

River herring bycatch events (NEFOP)

River herring hotspot ranking and river herring bycatch

Hotspot ranking (NMFS BTS)


Study Area: Eastern US Continental Shelf

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Data: Directed Herring Trips, 2005-2009

Q1-4

Year OT PR PS ALL

2005 77 774 200 1051

2006 150 739 175 1064

2007 414 389 365 1168

2008 109 304 246 659

2009 203 406 225 834

ALL 953 2612 1211 4776

Gear Category

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Q1-4

Year OT PR PS ALL

2005 15 465 95 575

2006 64 120 0 184

2007 59 75 27 161

2008 8 209 69 286

2009 35 437 97 569

ALL 181 1306 288 1775

Gear Category

VTRs Trips

NEFOP Hauls & Sets

>2,000 lbs of kept herring/trip

Gear Category Unique Trips

Bottom Otter Trawl (OT)

948

Mid-Water Trawl Single & Pair (PR)

2,595

Purse Seine (PS) 1,172

All 4,715

Data: Seasonal NMFS Bottom-Trawl Surveys, 1994-2008

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Year Winter Spring Fall ALL

1994 79 299 288 666

1995 120 288 298 706

1996 114 291 263 668

1997 109 293 287 689

1998 116 321 294 731

1999 121 291 296 708

2000 107 292 294 693

2001 146 280 283 709

2002 138 274 289 701

2003 70 271 281 622

2004 119 285 278 682

2005 82 261 279 622

2006 103 292 306 701

2007 117 316 295 728

2008 297 306 603

ALL 1541 4351 4337 10229

SeasonMonth Fishing Quarter Winter Spring Fall

1 1 16

2 1 1498 9

3 1 27 2402

4 2 1916

5 2 24

6 2

7 3

8 3

9 3 2262

10 4 1970

11 4 105

12 4

NMFS BTS Seasons

numbers = number of survey tows/season/yrnumbers = number of survey tows/month for all years

Outline




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Trips (VTR)





Fishing Effort: Directed Herring Trips, Q1, 2005-2009

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VTR Trips122 - 813

7 - 1211 - 6

0


8

VTR Trips122 - 813

7 - 1211 - 6

0


9

VTR Trips122 - 813

7 - 1211 - 6

0


10

VTR Trips122 - 813

7 - 1211 - 6

0

Outline




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Trips (VTR)





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Data: Seasonal NMFS Bottom-Trawl Surveys, 1994-2008

Fisheries Statistical Areas Survey Strata

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Spatial Stratification Schemes

Percent Occurrence

Ranked Raw Data Mean

Median

Ranked Z-Score Mean

Median

Ranked Q (Rankits) Mean

Median

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Ranking Methods

Percent Occurrence


Median

Ranked Z-Score Mean

Median


Median

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Ranking Methods

TowsRH, AREA

TowsTOTAL, AREA

Percent occurrence


Median

Ranked Z-Score Mean

Median


Median

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Ranking Methods

Highlights• Separated by season

•Fall•Winter• Spring

•Pooled 1994-2008 •Calculated percent occurrence for each statistical area/stratum

Percent occurrence


Median

Ranked Z-Score Mean

Median


Median

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Ranking Methods

Percent occurrence


Median

Ranked Z-Score Mean

Median


Median

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Ranking Methods Highlights

•Separated by season •Fall•Winter•Spring

•Used the number of river herring individuals per tow (density)•Calculated index for each tow within a year•Pooled standardized values 1994-2008 • Selected Median Q index for each statistical area/stratum


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Spring RH Hotspot Ranking by Fisheries Statistical AreaAREA TOWS Percent Occurrence Ranked Median Q Index Ranked

539 43 93.0% 1 0.048 12

515 166 91.6% 2 0.185 6

511 69 91.3% 3 0.411 4

512 83 86.7% 4 0.031 14

513 113 85.8% 5 -0.092 24

613 246 79.3% 6 -0.136 27

521 191 78.5% 7 -0.104 26

514 185 77.3% 8 0.004 19

537 241 74.3% 9 0.013 16

625 191 70.7% 10 -0.327 30

614 151 70.2% 11 0.009 17

621 273 70.0% 12 0.004 18

612 219 66.7% 13 0.023 15

615 119 62.2% 14 0.111 9

465 100 61.0% 15 -0.076 22

522 207 60.9% 16 0.034 13

631 179 52.0% 17 -0.203 28

464 89 48.3% 18 -0.097 25

616 119 47.1% 19 -0.049 20

561 49 42.9% 20 0.269 5

526 156 42.3% 21 -0.052 21

466 12 41.7% 22 0.471 3

635 156 21.8% 23 -0.549 32

525 230 20.4% 24 0.067 11

551 111 18.0% 25 0.127 8

622 122 12.3% 26 0.656 1

552 71 11.3% 27 -0.243 29

626 120 8.3% 28 0.147 7

562 134 4.5% 29 0.081 10

632 78 1.3% 30 0.486 2

636 39 0.0% 31 -0.338 31

702 53 0.0% 31 -0.085 23

NMFS BTS Spring 1994-2008

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Spring RH Percent Occurrence by Statistical Area

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> 74% - 100%> 52% - 74%> 18% - 52%> 0% - 18%

0%

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Spring RH Median Q-Index by Statistical Area

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Spring RH Median Q-Index by Statistical Area

> 0.111 - 0.656> 0.009 - 0.111> -0.097 - 0.009-0.549 - -0.097


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Spring RH Hotspot Ranking by Survey StratumSTRATUM TOWS Percent Occurrence Ranked Median Q Index Ranked

3590 10 100.0% 1 0.984 2

1240 89 95.5% 2 0.223 33

1370 74 93.2% 3 0.100 49

1380 59 93.2% 4 -0.426 81

3050 27 92.6% 5 -0.111 64

3600 23 91.3% 6 0.606 10

3450 22 90.9% 7 0.117 46

1400 32 90.6% 8 0.149 42

3020 29 89.7% 9 0.556 12

1351 27 88.9% 10 0.197 35

3660 16 87.5% 11 0.829 5

1050 63 87.3% 12 0.305 27

3360 29 86.2% 13 -0.782 91

1060 106 85.8% 14 -0.885 94

1390 42 85.7% 15 0.201 34

3300 14 85.7% 15 0.337 26

1280 105 84.8% 17 0.091 50

3270 13 84.6% 18 -0.637 89

3210 12 83.3% 19 -1.024 96

3280 30 83.3% 19 -0.421 80

1360 112 82.1% 21 -0.096 61

3240 28 82.1% 21 -0.278 74

3350 27 81.5% 23 -1.141 97

3340 30 80.0% 24 -1.403 106

3250 29 79.3% 25 0.691 6

3140 24 79.2% 26 0.551 13

3130 28 78.6% 27 -0.850 93

3220 31 77.4% 28 -1.442 107

1270 57 77.2% 29 -0.100 62

1340 69 76.8% 30 -0.436 82

1220 53 75.5% 31 0.175 39

3060 12 75.0% 32 -0.593 88

3180 12 75.0% 32 -0.337 77

1090 67 74.6% 34 -0.404 79

3160 31 74.2% 35 0.975 3

1070 27 74.1% 36 0.256 31

3170 27 74.1% 36 -0.447 83

1010 99 73.7% 38 -0.965 95

3330 15 73.3% 39 -1.873 108

3260 29 72.4% 40 1.268 1

3460 18 72.2% 41 0.440 19

3200 28 71.4% 42 0.117 45

3610 27 70.4% 43 0.669 7

3150 10 70.0% 44 0.252 32

3580 10 70.0% 44 -0.822 92

3110 29 69.0% 46 -1.358 105

3320 25 68.0% 47 0.129 44

1020 96 67.7% 48 -0.059 59

1250 37 67.6% 49 0.178 37

1290 106 66.0% 50 -0.271 72

1230 57 64.9% 51 -0.111 63

3230 28 64.3% 52 -1.150 98

3310 28 64.3% 52 0.009 54

1260 53 64.2% 54 -0.169 69

3040 30 63.3% 55 -0.466 84

3290 27 63.0% 56 -0.188 71

3400 31 61.3% 57 -0.337 78

3370 30 60.0% 58 0.379 24

3080 29 58.6% 59 0.275 29

3120 12 58.3% 60 -1.174 100

3190 31 58.1% 61 -0.161 67

3100 28 57.1% 62 0.286 28

3390 14 57.1% 62 -0.490 86

1690 86 57.0% 64 -0.177 70

1730 71 56.3% 65 0.070 51

1100 111 55.0% 66 0.176 38

3070 28 53.6% 67 -0.044 58

3090 15 53.3% 68 -0.330 76

3380 29 51.7% 69 0.921 4

3550 49 49.0% 70 -1.184 101

1030 27 48.1% 71 0.386 23

1300 42 47.6% 72 0.346 25

3410 25 44.0% 73 -0.162 68

3420 14 42.9% 74 0.132 43

1080 12 41.7% 75 0.453 18

3030 12 41.7% 75 0.582 11

1650 97 37.1% 77 -0.275 73

1740 55 32.7% 78 0.102 47

3440 29 31.0% 79 0.406 22

1180 10 30.0% 80 -0.664 90

1210 55 29.1% 81 0.151 41

1040 15 26.7% 82 0.261 30

1330 24 25.0% 83 0.653 9

1140 43 23.3% 84 0.510 15

3430 28 21.4% 85 0.653 8

1110 29 20.7% 86 -1.306 103

1130 132 20.5% 87 -0.031 56

1170 40 20.0% 88 0.052 52

1190 119 18.5% 89 0.186 36

1150 11 18.2% 90 -0.149 66

1200 72 18.1% 91 -1.208 102

1610 43 16.3% 92 -0.032 57

1700 53 13.2% 93 0.415 21

1750 33 9.1% 94 -1.317 104

1760 13 7.7% 95 0.426 20

7510 19 5.3% 96 -0.486 85

7520 20 5.0% 97 -0.323 75

1670 30 3.3% 98 0.168 40

1160 161 2.5% 99 -0.116 65

8500 43 2.3% 100 0.458 17

1660 45 2.2% 101 0.463 16

1620 31 0.0% 102 -1.159 99

1630 26 0.0% 102 0.102 48

1640 13 0.0% 102 0.525 14

1710 30 0.0% 102 -0.009 55

1720 13 0.0% 102 -0.584 87

8510 21 0.0% 102 -0.082 60

8520 19 0.0% 102 0.047 53

NMFS BTS Spring 1994-2008

…

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Spring RH Percent Occurrence by Survey Stratum

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Spring RH Percent Occurrence by Survey Stratum

> 77.4% - 100%> 63.3% - 77.4%> 26.7% - 63.3%

0% - 26.7%

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Spring RH Median Q-Index by Survey Stratum

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Spring RH Median Q-Index by Survey Stratum

> 0.305 - 1.268> 0.009 - 0.305> -0.426 - 0.009-1.872 - -0.423


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Comparison for Spring RH Percent Occurrence


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Spring Comparison for RH Median Q Index

percent occurrence by statistical area

median Q index by statistical area

percent occurrence by survey stratum

median Q index by survey stratum

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RH Hotspot Ranking by Stratification Scheme

Fall RH Percent Occurrence by Statistical Area

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Winter RH Percent Occurrence by Statistical Area

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37


Fall RH Percent Occurrence by Statistical Area

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> 74% - 100%> 52% - 74%> 18% - 52%> 0% - 18%

0%

Winter RH Percent Occurrence by Statistical Area

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> 74% - 100%> 52% - 74%> 18% - 52%> 0% - 18%

0%

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> 74% - 100%> 52% - 74%> 18% - 52%> 0% - 18%

0%

Seasonal NMFS Bottom-Trawl Surveys, 1994-2008

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Month Fishing Quarter Winter Spring Fall

1 1 16

2 1 1498 9

3 1 27 2402

4 2 1916

5 2 24

6 2

7 3

8 3

9 3 2262

10 4 1970

11 4 105

12 4

NMFS BTS Seasons

numbers = number of survey tows/month for all years

Fishing Effort, Q3&4 Percent Occurrence, Fall

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Comparison Using Statistical Areas

Fishing Effort, Q1 Percent Occurrence, Winter

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Fishing Effort, Q1&2 Percent Occurrence, Spring

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In general, quarterly river herring bycatch events overlap with quarterly fishing effort concentrations.

Similar patterns of quarterly river herring bycatch events overlap seasonal river herring hotspots using percent occurrence per statistical area.

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Summary

Herring Oversight Committee

Review PDT recommendations

Develop options for river herring hotspots

Herring Plan Development Team

Update analysis and white paper (July 29 to mid-August)

Present update at next PDT meeting (mid-August)

Present findings and PDT recommendations at next Herring Committee Meeting (September 1-2)

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Next Steps

study area: eastern us continental shelfarchive.nefmc.org/herring/cte mtg docs/100727-28...atlantic...

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