1. Pelagic Longline Take Reduction Team Update: Abundance and Mortality September 16 2010 Dr. Lance P. Garrison Dr. Patricia Rosel Southeast Fisheries Science Center

2. Abundance Estimate (CV) Nmin Potential Biological Removal Combined Short- finned and Long- finned (2009 SAR) 31,139 (0.27)24,866249 Long-finned pilot whale (Draft 2010 SAR) 12,619 (0.37)9,33393 Short-finned pilot whale (Draft 2010 SAR) 24,674 (0.45)17,190172 Revised Abundance Estimates: Draft 2010 SAR Average Mortality and Serious Injury (combined) 2004-2008: 175 (CV = 0.14)

3. Splitting Abundance Estimates: Approach Analytical Approach: Logistic regression to predict the probability of a sample being from shortfin (or longfin) pilot whale based on location of sample, water depth, surface water temperature, surface chlorophyll Habitat Data: Remotely sensed habitat SST (1 km) and CHL (4km) 8-day composites used to extract values based on sample location/collection date. Bottom depth from 1-minute resolution bathymetry grid. Prediction: Predict the probability that an observed group of pilot whales is of a particular species based on environmental conditions at sighting location. Use this probability to partition abundance estimates from 2004 surveys.

4. YearMonthLong-finnedShort-finnedTotal 1998July550 1998August202 2001August101 2004June066 2004July452772 2005July67783 2006July087 2006August033 2007July101 2007August111728 TOTAL121217338 Pilot Whale Abundance Estimates: Biopsy Samples from June-August Includes both Field Collection and Bycatch

5. Pilot Whale Abundance Estimates: Biopsy Samples from June-August

6. Pilot Whale Abundance Estimates: Logistic Regression Results Best model included Depth, SST and their Interaction effect

7. Pilot Whale Abundance Estimates: 2004 Summer Pilot Whale Sightings All sightings in the NEC aerial surveys are expected to be long- finned pilot whales. Abundance estimate: 11,038 (CV = 0.4) All sightings in the SEC ship survey are expected to be short- finned pilot whales Abundance estimate: 21,056 (CV = 0.5) Sightings in the NEC ship survey are in the mixed zone.

8. Pilot Whale Abundance Estimates: Probability of Being Short-finned

9. Species Bootstrap Mean Abundance Bootstrap 95% Confidence Limit Short- finned 3,6181,112 – 8,294 Long- finned 1,581130 – 5,307 Pilot Whale Abundance Estimates

10. SurveyLatitude RangeSpecies Abundance estimate (CV) Atlantic Cetacean Survey (SEFSC ) 28° N to 38° NShort-finned21,056 (0.52) Northeast Cetacean Survey - Vessel (NEFSC) 38° N to 41° NMixed SF - 3,618 (0.50) LF - 1,581 (0.86) Northeast Cetacean Survey - Aerial (NEFSC ) 41° N to ~45° NLong-finned 11,038 (0.40) Total Abundance Estimates (CV) Short-finned24,674 (0.45) Long-finned12,619 (0.37) Pilot Whale Abundance Estimates

11. Pilot Whale Bycatch and Biopsy Data Limited Data to Parse Out Mortality Estimates

12. Longline Observer Biopsy Samples false killer whale Risso’s dolphin SF pilot whale, common dolphin minke whale bottlenose dolphin pantropical spotted dolphin sperm whale pygmy sperm whale

13. Longline Observer Biopsy Samples We have received 10 biopsy samples between November 2008 and April 2010 Wide variety of species 1 short-finned pilot whale off of New Jersey Field IdentificationGenetic Identification Unknown marine mammalSperm whale Pilot whaleFalse killer whale Bottlenose dolphinNot run yet Risso’s dolphinNot run yet Pantropical spotted dolphin Pilot whale sp.Short-finned pilot whale Common dolphin Unidentified large whaleMinke whale Pantropical spotted dolphin Dwarf sperm whalePygmy sperm whale

14. Observed Interactions - 2009

15. QuarterCARFECGOMMABNECNEDSABSARTUNTotal 10.0012.099.314.10--22.4022.770.0011.90 20.006.0058.257.360.00 8.1842.949.4230.12 3-8.387.449.2214.3616.574.52-0.009.24 4-10.3511.5310.5228.610.0015.5932.810.0012.06 Total0.009.5422.409.0814.1112.4311.9627.423.3115.80 Percent Observer Coverage - 2009

16. Observed Interactions - 2009 SpeciesDead Serious InjuryReleased AliveTotal Pilot Whale0 224 Risso's Dolphin 0235 Bottlenose Dolphin 0213 Common Dolphin1001 Pantrop. Spotted Dolphin0415 Unid. Dolphin 0011 Unid. Marine Mammal 0101 Total111820

17. Pilot Whale Bycatch Rates- 2009 Quarter Area 2005-2008 CPUE 2005-2008 95% CI 2009 CPUE 2009 95% CI 1 MAB0.29960.1349 – 0.6649 0 - 2 MAB 0.11140.0339 – 0.3669 0 - 3 MAB 0.17830.1065 – 0.2984 0.0208 0.0041 – 0.1065 3 NEC 0.00910.0019 – 0.0443 0.0272 0.0053 – 0.1389 4 MAB 0.11480.0596 – 0.2210 0.0406 0.0116 – 0.1382 Pilot whale bycatch rates were lower than normal in each quarter. No interactions in quarters 1 & 2. No serious injuries observed in quarter 3.

18. Risso’s Bycatch Rates- 2009 Quarter Area 2005-2008 CPUE 2005-2008 95% CI 2009 CPUE 2009 95% CI 3 MAB 0.00460.0009 – 0.0226 0.0242 0.0047 – 0.1239 3 NEC 0.02580.0075 – 0.0891 0.0689 0.0245 – 0.1934 3 NED 0- 0.0274 0.0054 – 0.1401 4 MAB 0.02710.0110 – 0.0670 0 - 4 NEC 0.04760.0097 – 0.2327 0 - Risso’s Dolphin bycatch rates were higher in the 3 rd quarter, but lower in the 4 th Quarter.

19. Estimated Annual Bycatch - 2009 Species Alive 95% CI Serious Injury/Mortality SI 95% CI Total Common Dolphin 0 -8.5 1.7 – 43.4 8.5 Bottlenose Dolphin 11.3 2.2 – 57.611.6 3.0 – 44.8 22.9 Pantropical Spotted Dolphin 12.5 2.4 – 63.914.0 4.4 – 45.5 26.5 Risso’s Dolphin 27.1 9.1 – 80.911.4 3.3 – 39.9 38.5 Pilot Whale 19.2 5.4 – 67.916.5 4.8 – 56.8 35.7 Unid. Dolphin 1.6 0.3 – 8.20 - 1.6 Unid. Marine Mammal 0 -8.0 1.6 – 41.2 8.0

20. Pilot Whale Bycatch and Effort Trends

21. Risso’s Dolphin Bycatch and Effort Trends

22. Observed Bycatch Quarters 1 and 2 of 2010

23. SpeciesRegion # Released Un- injured # Dead# Serious Injury Pantropical Spotted DolphinGOM100 Unidentified Marine Mammal GOM010 Pilot WhaleFEC001 Minke WhaleSAB100 SpeciesRegion # Released Un- injured # Dead# Serious Injury Un-identified DolphinGOM100 Bottlenose Dolphin GOM (Exp.) 001 Unidentified Marine Mammal GOM001 Pygmy Sperm WhaleGOM010 Pilot WhaleMAB003 Bottlenose DolphinSAB100 Quarter 1 Quarter 2 Observed Bycatch Quarters 1 and 2 of 2010

24. QuarterSpecies Area 2005- 2009 CPUE 2005-2009 95% CI 2010 CPUE 2010 95% CI 1Pilot Whale FEC0- 0.0702 0.0137 – 0.3588 1Pilot Whale MAB0.2781 0.1251 – 06188 0 - 2Pilot Whale MAB0.0068 0.0201 – 0.222 0.8403 0.1607 – 4.309 Bycatch Rates Quarters 1 and 2 of 2010 Very high bycatch rate in quarter 2. 3 Pilot whale SI in one set.

25. Mainline Length in MAB Before and After PLTRP Rule