NRC, UMASS Amherst ATL ANTIC HERRING PDT Jamie M. Cournane, PhD University of New Hampshire and Environmental Defense Fund Steven Correia Massachusetts Division of Marine Fisheries NEFMC Atlantic Herring Oversight Committee Meeting July 28, 2010 in Portland, ME
Outline Alewife Blueback herring 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) River herring bycatch events (NEFOP) Images from: http://mapping2.orr.noaa.gov/portal/delaware/lifehistory.html http://pond.dnr.cornell.edu/nyfish/clupeidae/alewife.html 2
Study Area: Eastern US Continental Shelf 3
Gear Category Bottom Otter Trawl (OT) Mid-Water Trawl Single & Pair (PR) Data: Directed Herring Trips, 2005-2009 >2,000 lbs of kept herring/trip Unique Trips 948 2,595 Purse Seine (PS) 1,172 All 4,715 VTRs Trips Q1-4 Gear Category 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 NEFOP Hauls & Sets Q1-4 Gear Category 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 4
Data: Seasonal NMFS Bottom-Trawl Surveys, 1994-2008 numbers = number of survey tows/month for all years NMFS BTS Seasons 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 numbers = number of survey tows/season/yr Season 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 5
Outline Alewife Blueback herring 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) River herring bycatch events (NEFOP) Images from: http://mapping2.orr.noaa.gov/portal/delaware/lifehistory.html http://pond.dnr.cornell.edu/nyfish/clupeidae/alewife.html 6
Fishing Effort: Directed Herring Trips, Q1, 2005-2009 VTR Trips 122-813 7-121 1-6 0 7
Fishing Effort: Directed Herring Trips, Q2, 2005-2009 VTR Trips 122-813 7-121 1-6 0 8
Fishing Effort: Directed Herring Trips, Q3, 2005-2009 VTR Trips 122-813 7-121 1-6 0 9
Fishing Effort: Directed Herring Trips, Q4, 2005-2009 VTR Trips 122-813 7-121 1-6 0 10
Outline Alewife Blueback herring 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) River herring bycatch events (NEFOP) Images from: http://mapping2.orr.noaa.gov/portal/delaware/lifehistory.html http://pond.dnr.cornell.edu/nyfish/clupeidae/alewife.html 11
Data: Seasonal NMFS Bottom-Trawl Surveys, 1994-2008 12
Spatial Stratification Schemes Fisheries Statistical Areas Survey Strata 13
Ranking Methods Percent Occurrence Ranked Raw Data Mean Median Ranked Z-Score Mean Median Ranked Q (Rankits) Mean Median 14
Ranking Methods Percent Occurrence Ranked Raw Data Mean Median Ranked Z-Score Mean Median Ranked Q (Rankits) Mean Median Tows RH, AREA Tows TOTAL, AREA 15
Ranking Methods Percent occurrence Ranked Raw Data Mean Median Ranked Z-Score Mean Median Ranked Q (Rankits) Mean Median Highlights Separated by season Fall Winter Spring Pooled 1994-2008 Calculated percent occurrence for each statistical area/stratum 16
Ranking Methods Percent occurrence Ranked Raw Data Mean Median Ranked Z-Score Mean Median Ranked Q (Rankits) Mean Median 17
Percent occurrence Ranked Raw Data Mean Median Ranked Z-Score Mean Median Ranked Q (Rankits) Mean Median 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 18
Spatial Stratification Schemes Fisheries Statistical Areas Survey Strata 19
Spring RH Hotspot Ranking by Fisheries Statistical Area NMFS BTS Spring 1994-2008 AREA 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 20
Spring RH Percent Occurrence by Statistical Area 21
Spring RH Percent Occurrence by Statistical Area > 74% - 100% > 52% - 74% > 18% - 52% > 0% - 18% 0% 22
Spring RH Median Q-Index by Statistical Area 23
Spring RH Median Q-Index by Statistical Area > 0.111-0.656 > 0.009-0.111 > -0.097-0.009-0.549 - -0.097 24
Spatial Stratification Schemes Fisheries Statistical Areas Survey Strata 25
Spring RH Hotspot Ranking by Survey Stratum NMFS BTS Spring 1994-2008 STRATUM 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 26
Spring RH Percent Occurrence by Survey Stratum 27
Spring RH Percent Occurrence by Survey Stratum > 77.4% - 100% > 63.3% - 77.4% > 26.7% - 63.3% 0% - 26.7% 28
Spring RH Median Q-Index by Survey Stratum 29
Spring RH Median Q-Index by Survey Stratum > 0.305-1.268 > 0.009-0.305 > -0.426-0.009-1.872 - -0.423 30
Spatial Stratification Schemes Fisheries Statistical Areas Survey Strata 31
Comparison for Spring RH Percent Occurrence Fisheries Statistical Areas Survey Strata 32
Spring Comparison for RH Median Q Index Fisheries Statistical Areas Survey Strata 33
RH Hotspot Ranking by Stratification Scheme percent occurrence by statistical area median Q index by statistical area percent occurrence by survey stratum median Q index by survey stratum 34
Fall RH Percent Occurrence by Statistical Area 35
Winter RH Percent Occurrence by Statistical Area 36
Spring RH Percent Occurrence by Statistical Area 37
Fall RH Percent Occurrence by Statistical Area > 74% - 100% > 52% - 74% > 18% - 52% > 0% - 18% 0% 38
Winter RH Percent Occurrence by Statistical Area > 74% - 100% > 52% - 74% > 18% - 52% > 0% - 18% 0% 39
Spring RH Percent Occurrence by Statistical Area > 74% - 100% > 52% - 74% > 18% - 52% > 0% - 18% 0% 40
Seasonal NMFS Bottom-Trawl Surveys, 1994-2008 numbers = number of survey tows/month for all years NMFS BTS Seasons 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 41
Comparison Using Statistical Areas Fishing Effort, Q3&4 Percent Occurrence, Fall 42
Comparison Using Statistical Areas Fishing Effort, Q1 Percent Occurrence, Winter 43
Comparison Using Statistical Areas Fishing Effort, Q1&2 Percent Occurrence, Spring 44
Summary 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. 45
Next Steps 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) 46