Catch and Release: Large whale entanglements and response ... · Catch and Release: Large whale...
Transcript of Catch and Release: Large whale entanglements and response ... · Catch and Release: Large whale...
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Catch and Release: Large whale entanglements and response to mitigate the threat
Ed Lyman Hawaiian Islands Humpback Whale National Marine Sanctuary
NOAA Fisheries’ Marine Mammal Health and Stranding Response Program
National Marine Sanctuaries Webinar Series July 10, 2019
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Map of sanctuary
• Five separate protected areas • From shoreline to depth of 100
fathoms (600 feet) • 1,370 square miles of federal and
state waters
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NOAA Permit #15240
0
2800
5600
8400
11200
14000
1975 1982 1990 1997 2005 2012
y = 0R² = 0.9644
Time
• > 50% of humpback whales in North Pacific use Hawaii
• Population has generally increased and in 2016 taken off Endangered Species List (i.e. delisted)
• Entanglement remains a risk for these and other humpback whales, as well as, many other species
?
* Darling et al, 1983 Baker and Herman, 1987 Mobley et al, 2001Cerchio, 1998 Calambokidis et al, 2008Calambokidis et al, 1997
Special Place: Primary breeding/ calving ground for the North Pacific humpback whales
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4Courtesy of Jason Moore/ NOAA MMHSRP permit # 932-1905
What we want to cover
• Background on threat
• Goals/ objectives
• How to cut a 40-ton, free-swimming whale free (catch and release)
• Review case histories as examples of technology used and information gained
• Our accomplishments and some examples of mitigating measures
• Summary
With a focus on Hawaii and humpback whales
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!5
Entanglement Threat
• Global issue
• Many species impacted
• Involves a variety of gear/ not just fishing gear
• Tend to know more about impact for smaller species
G. Freitag PCCS
PCCS
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Impacts for large whales: Individual level
!6
• Physical trauma
• Deterioration of health
• Chronic/ systemic infections
• Associated factors (ship-strike)
• Starvation
• Drowning
NOAA MMHSRP (permit # 18786-02)
PCCS
HMMC/ MMHSRP #932-1489
AKPRD/ MMHSRP #932-1489PCCS
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Impacts: Population level
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• Estimated world-wide mortality for cetaceans at 308,000/yr (Read et al, 2006)
• Considered one of largest “anthropogenic” threats
• Humpback whales represent 66.0% of large whale entanglement cases reported in US over the last decade (HIHWNMS and NMFS data)
NOAA MMHSRP (permit # 932-1489)
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North Atlantic Right Whales
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• For some species may be having a significant impact on population
• Population estimated at ~ 400 animals
• Scar rates upwards of 87%
• Overlap of animals with gear - urban whale..
• Three reports this last week of entangled right whales Courtesy of PCCS
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�9
Impact typically not immediate
Threat remains, but have some time
and as a result ….
HIHWNMS/ MMHSRP #932-1489
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Buys us time to free them
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Photo: Mark Ferrari, CWS/ NOAA MMHSRP (#932-1489)
They very likely do not realize you are there to help them
Can be difficult and dangerous
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• Responsibility of NOAA Fisheries Office of Protected Resources
• Authorized via ESA/MMPA permit issued to the Marine Mammal Health and Stranding Response Program (Permit # 18786-03)
• Based on a set of criteria involving experience, training, availability, resources and conditions
National Large Whale Entanglement Response Program
Flip Nicklin
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Goals: Value of entanglement response
HIHWNMS/ MMHSRP #932-1489
• Increase awareness
• Public safety
• Release some large whales from life threatening entanglements
• Gather information towards reducing threat
WET/ NOAA MMHSRP (permit # 932-1905)
Why respond? Value of entanglement response
Manage risk under NOAA Fisheries’ Office of Protected Resources Marine Mammal Health and Stranding Response Program
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Challenges in gaining information
• Small sample size
- Big needles in a big haystack - Opportunistic reporting - Challenges of identifying
gear and source - Cases likely removed in time
and space
• Risk - Big ocean
- Big animals - Mobile
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HIHWNMS/ MMHSRP #932-1489
February 7, 2007, Humpback whale off Upolu Pt.
• Increases scope of effort (unique/ more comprehensive)
• May act as a filter (temporal/ spatial filter)
• Increases operational safety (clear, warm, calm seas)
• Increases assessment (animal, entanglement, behavior)
• Aloha spirit (increases assistance and support)
Advantages of Hawaii’s clear, warm, protected waters, and aloha spirit towards large whale entanglement response
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• > 400 reports • 209 (51.9%) confirmed • 141 animals • Reports of entanglement
under-estimate threat
Entanglement reports
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Confirmed Large Whale Entanglements Nationwide (2007 - 2018)
!17Data compiled by NOAA Fisheries OPR under MMHSRP
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Scar analysis
!18PCCS
Hawaii: 2013 - 2019
Robbins and Mattila, 2004; *Neilson, J. 2006; Robbins et al, 2006)
• Entanglement threat pervasive
• Percentage scarred generally between 30 to 70%
• Many more animals entangled than sightings would suggest. In Gulf of Maine fewer than 10% reported
• Many animals throw gear on their own given time
Chad Kruzic, Gastineau Guiding
PCCS
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Scar analysis Hawaii: 2013 - 2019
• Hawaii scar rates range from 16.3% - 33.8% • This season’s average scar rate is 17.3%
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Photo: Jan Straley
�20
But how do you free a 40-ton, 45-foot, likely free-swimming
whale that likely doesn’t realize you are there to help it ?
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Kegging: Modification of a historic whaling technique (Gone Fishing)
• Use grapple or skiff hook to attach to whale (via gear) instead of a harpoon
• Add polyball buoys instead of barrels to slow whale down and keep it near the surface
• Use hooked knives on long poles to free whales instead of the lance blade to kill them
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22NOAA HIHWNMS/ MMHSRP #932-1905
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NOAA HIHWNMS/ MMHSRP #932-1905
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!24D. Verbeck, NOAA MMHSRP (permit # 932-1905)
2/13/2015: Adult humpback whale reported entangled off the island of Hawaii
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2/15
Full Cache
First responder cache
2/162/17
2/18
2/19
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NOAA HIHWNMS/ MMHSRP #932-1905
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NOAA HIHWNMS/ MMHSRP #932-1905
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!28
Entangled Humpback Whale off Maui 1/11/2018
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!29NOAA MMHSRP (permit # 18786-02)
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!30
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February 17 - 18: Entangled subadult humpback whale off
Maui
NOAA MMHSRP (permit # 18786-03)
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!32
Wrangell, AKUnimak Pass, AK
Pribilof Isl, AK
Hecate St, BC
Gear from Alaska and British Columbia
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Gear Types Hawaiʻi (2002 - present)
• 51.5% of gear identified to gear type
• 68.6% fixed gear (of IDed gear)
• 41.5% (n=31) pot (trap) gear
– 11 local
– 20 from Alaska / BC
!33HIHWNMS data, 2018
HIHWNMS/ MMHSRP #932-1489(#) represent sample size
(31)
(1)
(14)
(8)
(13)(3)
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NOAA MMHSRP (permit # 18786-01)
• Cables - communications
• Mooring/ anchor gear
• FADs (fish aggregating device)(aquaculture)
Changes in gear types?
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Environmental changes
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El Nino
Blob
PDO• Blob: Region of warmer than average
temperature water off West Coast to Gulf of AK
• Pacific Decadal Oscillation (PDO): Long-lived El Niño-like pattern of Pacific climate variability above 20º lat.
• El Niño: Warm phase associated with a band of warm ocean water that develops in the central and east-central equatorial Pacific
Summer 2016
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Comparison of regional reports of humpback whales over time
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0
10
20
30
40
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
HawaiiAlaskaWest Coast
British Columbia
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Gear from British Columbia
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0.0
• Prior to 2015-16 season, only a few cases of gear from BC known
• Since 2015-16 season, cases involving BC gear have increased. However,
• Reminder, sample sizes are small
NOAA MMHSRP (permit # 18786-02)
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Mouth entanglements Alaska and Hawaii reports)
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• Prior to 2015-16 season, % of cases involving the mouth was around 25%
• Since 2015-16 season, value lies at 50%
NOAA MMHSRP (permit # 18786-02)
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!39NOAA HIHWNMS/ MMHSRP #932-1905
Entangled humpback calf off Lahaina December 15 - 18, 2013
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NOAA HIHWNMS/ MMHSRP #932-1905NOAA HIHWNMS/ MMHSRP #932-1905
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Who - Age Class Hawaiʻi 2002 - To date*
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• Age class known in 85.8 % (n=120) of cases
• Juveniles and calves represented the majority (53.4%, n=55) of known aged animals
NOAA MMHSRP 932-1905(#) represent sample * April 26, 2019
(49)
(48)
(6)
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Hawaiʻi accomplishments 2002 - to date
• Gear removed from 32 whales
• 28 animals (27 humpback whales and 1 sei whale) freed of significants amount of gear
• Representing a ~43% success rate toward those cases warranted and able
• More than 12,000 feet of line removed
• More than 70 sets of gear removed or documented identified.
!42
NOAA MMHSRP 932-1905
Mounted more than 180 responses
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Mitigating measures: Reduce frequency/ occurrence
• Time and area closures
• Reduced scope, sinking line, no wet storage, ropeless gear
• Colored lines
• Acoustic alerts
!43Courtesy of Bycatch.org
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• Weak lines and weak links
• Reduce scope/ tighter lines
• Stronger anchoring
• Tended fisheries
!44
Mitigating measures: Reduce severity/ ease of self-release
Courtesy of Massachusetts Div. of Marine Fisheries
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Disentanglement: What is a success?
• All potentially lethal gear off the animal
• Minimum injuries to the whale and none to rescuers
• Increase awareness
• Gain information towards reducing overall threat
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Rgt flipper entanglement
NOAA HIHWNMS/ MMHSRP #932-1905
• Response effort in Hawaii increased the scope of our effort towards understanding the impact and reducing risks
• Entanglement threat continues to be dynamic
• Changes in the animals’ environment/ ecology, likely affect threat
• Full extent of threat/ impact is still unknown
• We are cutting some large whales free and making progress towards saving many others in the future
Conclusions
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• NOAA Office of Protected Resources• NOAA Office of National Marine Sanctuaries• NOAA Fisheries Protected Resources Div. - Pacific Islands and Alaska Regions • NOAA Fisheries Pacific Islands Fisheries Science Center• NOAA Office of Law Enforcement • NOAA Corps • Hawaiian Islands Humpback Whale National Marine Sanctuary • Hawaii Department of Land and Natural Resources • U.S. Coast Guard/ CG Aux. (D14/ D17)• Kaho’olawe Island Reserve Commission• National Marine Sanctuary Foundation• Provincetown Center for Coastal Studies• Canada’s Division of Fisheries and Oceans• Fishers (Commercial, sport, recreational)• Whale researchers (NGOs)• Commercial tour operators• Watermen (other ocean -users)
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AcknowledgementsCourtesy of Jason Moore/ NOAA permit # 15240
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Resources
• https://hawaiihumpbackwhale.noaa.gov/res/entanglement.html
• https://www.fisheries.noaa.gov/national/marine-life-distress/marine-mammal-health-and-stranding-response-program
• https://nmshawaiihumpbackwhale.blob.core.windows.net/hawaiihumpbackwhale-prod/media/archive/res/pdfs/disentanglement_one_page.pdf
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Mahalo Any questions?
!49