Overview of Pinniped Predation: Regulatory and Logistical ...€¦ · Model - abundance of sea...
Transcript of Overview of Pinniped Predation: Regulatory and Logistical ...€¦ · Model - abundance of sea...
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CHRISTINE KOZFKA YDON WHITNEY
IDA HO DEPA RTMENT OF FISH A ND G A ME
Overview of Pinniped Predation:Regulatory and Logistical Challenges of
Sea Lion Removal
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Overview
Sea lions in Columbia River Predation impacts Legislation and permitting under MMPA 2019 removal efforts Current and future costs/needs
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California vs. Stellar Sea Lion
California Sea Lions
• Range SE AK to central Mexico• Pop Size ~300K • Live up to 17 yrs in wild• Mature at 4-6, but defend 8-10 yrs• Mainly breeds in Channel Islands
Steller Sea Lions
• Eastern stock range: CA to SE AK• Pop Size ~71K • Live up to 30 yrs in wild• Defend territories until 9-13 yrs• Rookeries in CA, OR, BC and SE
AK
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History of Sea Lions in Columbia River
In the 1980’s, CSLs started appearing in the Columbia R
Progressively been moving up the Columbia River to Bonneville Dam
Sea Lion in Fish Ladder at Bonneville
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Sea Lions @ Bonneville Dam
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018CSLs 30 104 99 81 72 71 82 54 89 54 39 56 71 195 149 92 67SSLs 0 3 3 4 11 9 39 26 75 89 73 80 65 69 54 63 66
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Movement Patterns of CSLs
Wright et al. (2010):
14 “river-type” males in East Mooring Basin and South Jetty haul-outs
Time between EMB and Bonneville (131 miles, 1.9 days, 5 miles/hour)
Leave for rookeries June San Miguel & San Nicolas Islands
(~970 miles)
Males fast while defending territories during breeding
CSL stayed EMB but 4 trips Feb-May,Weight in Jan = 650 lbs, May 21, 1050 lbs
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Measuring Predation Impacts
USACOE: Estimated predation in 1/4 mile reach below Bonneville Dam
Trained observers document surface predation events from Jan - June
Stratified random sampling design – estimate number of pinnipeds, fish consumed/wk
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Measuring Predation Rates
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CSL Consumption SSL Consumption
~0.4% to 5.8% of Counts at Bonneville Dam; Majority Sp/Su Chinookwinter steelhead consumed by SSLs and unknown smolts
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Measuring Predation Impacts
Bioenergetic Studies Chasco et al. (2017a)
Not direct estimate but can inform level/scale of predation if assumptions are valid
Model - abundance of sea lions, sex, age-structure, weight-at age for sea lion, energy and size class of Chinook, spatial and temporal overlap
In 2015, 65K Chinook adults and 70K jacks eaten by sea lions in Columbia R.
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Measuring Predation Impacts
Rub et al. 2019: PIT-tagged Spring Chinook Salmon in estuary in April(N = 1,424; 2010 – 2015)
Estimate survival to Bonneville Dam
Release week, length, adipose-fin, shad abundance, sea lion abundance, eulachon abundance
Accounted for sport/commercial harvest
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Measuring Predation Impacts
All factors important to overall mortality
Highest ranked - Sea lion abundance, shad abundance and adipose fin
Fish tagged earlier – lower survival (e.g Rapid River)
Non-harvest mortality ranged from 20% to 44% (50K to 224K adults)
“Given that average returns of wild spawners was 4450 for UCR and 33,133 for the SR from 2010 to 2015, our
observed high end (natural) mortality does not appear to be sustainable in the future”
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Lessons Learned – Ballard Locks
1982 - 2,575 winter steelhead Lake Washington 1985 – Hershel swam from CA to the locks and 10
other males followed 1985-1992; predation rates 42 – 65% of the run 1994 – 70 steelhead; MMPA amended
https://www.hakaimagazine.com/features/herschel-the-very-hungry-sea-lion/
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Section §120 - Marine Mammal Protection Act
“States may apply to (NMFS to) lethally take individually identifiable pinnipeds that are having a
significant negative impact on the decline or recovery of a salmonid stock that is being considered for or is listed as threatened or endangered under the ESA”
Aka “Ballard Locks amendment”
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Lessons Learned – Ballard Locks
1996 – 3 trapped and moved to Sea World 2000 – 2004 20 – 48 steelhead
Run deemed “functionally extinct”
https://www.hakaimagazine.com/features/herschel-the-very-hungry-sea-lion/
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Lessons Learned – Willamette Falls
ODFW (2017): 90% probability that winter Steelhead will go extinct
2017 – Record low of steelhead passed falls (512); 25% predation2018 – NMFS approved lethal removal
1,829 fish return; removed 3 CSLs2019 – Removed 30 CSLs
Run improved > 3,118
https://www.dfw.state.or.us/fish/SeaLion/
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Section §120 - Marine Mammal Protection Act
2008 - NMFS authorized removal of CSLs under specific conditions:
Up to 92 CSLs a year Individually identifiable (trapped, marked, released)Observed at Bonneville Dam for 5 daysObserved eating a salmonSubject to non-lethal hazing first
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Sea Lion Removals at Bonneville Dam
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CSL Removal
Min CSL Observed
Min SSL Observed
Tidwell et al. 2019, Steingass et al. 2019
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Recent Revisions to the MMPA“Endangered Salmon and Fisheries
Predation Prevention Act”SB 3119
HR 2083 Passed & signed December 2018
Modifies Section §120: Tribal co-management Improve efficiency Removal not contingent on
hazing or observational criteria
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NMFS Permit Application
• Law allows NMFS to issue permit
• Submitted permit application -June 2019
• Finished Public Comment Period – Oct 30, 2019 (22k comments)
• New LOA in 2020
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Criteria for Removals
Section §120(Current Permit)
Section §120(New Permit)
Geographic range Observed eating salmon at Bonn Dam, vicinity below Dam or above Dam
Mainstem of CR aboveRKM 112 and any trib of CR below Bonn
Duration Jan 1 – May 31Been observed for 5 (3) days
N/A
Hazing Subject to non-lethal deterrence first
N/A
Annual RemovalCap
92 CSLs , 0 SSLs ~920 CSLs, 249 SSLs144-286 CSLs, 105-130 SSLs
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Sea Lion Removals
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Bonneville Removals 2019
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SSL’s 9-12’ length up to 2,500 lbs.CSL’s 7-8’ length up to 1,000 lbs.
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The “Project”
The Locks
The Haul Out Traps
The Haul Outs w/o Traps
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Idaho’s Role• 2 Biologists 2 months: Don Whitney/Robert Hand• 2 Vets@ 2 months • Everyone’s Role
• Don’t get hurt• Don’t let the team get hurt• Look at the person between the traps
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The Traps Live Feed Cameras
RemoteElectromagneticRelease
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Leave Camp 3am
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Viewing traps live
Play Willamette trap video
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Daylight view from remote trigger
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Who is in there?
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Confirming Take, Brand and/or Release
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CSL Vertical
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CLS Climbing the Trap
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Transferring Animals
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Branding CSL’s
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Bonneville Locks
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Locking In
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Locking with Tourists
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Move to 33 seconds
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Inside the Locks
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Barge to Truck Transfer
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Processing: CSL Euthanasia/ SSL Branding
• CSL processing (@ 2 hours/animal depending)• Diet Analysis
• Stomach (scan for PIT tags)• Large Intestine• Fat Content
• Viral: Herpes etc.• Blood, muscle for contaminates (Mercury, PCB’s)• Aging structures• Meeting rendering facility requirements
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Steller Getting Ready for a Temporary Nap
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After Capture/Processing
• Clean-Up• Trap Repairs• Electronics• Test Electronics• Reset Drop Gates• Boat Maintenance• Planning Next Capture
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Project Needs (for Bonneville)
• @ 8 capable crew members• Able to pass security• Physical and know anatomy• Electronics• Construction• Understanding this work is necessary!
• 2 boats• Multiple traps
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Why so few removed in 2019?
• Really poor springer returns (Payoff is #1)• Cold water• But, …… the upshot is that we removed 19/22 =
86% of the CSLs available for removal. Of the three that eluded removal, 1-97 was never trapped (trap shy?), 2-64 eventually got on the list but migrated before he could be recaptured, and 2-65 did not make the list before he migrated!
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Expanding Operations (my thoughts)
• Hazing and relocating does not work• $ (Traps, etc.)• Other alternatives to trapping for CSL’s and now
more importantly SSL’s for euthanasia!• Removals alter learning behavioor
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Personnel and Equipment
Current efforts @Bonneville Dam (under existing permit)
6-8 weeks in Spring Need 1 licensed veterinarian & ~9 staff Food and lodging Supplies and equipment
Drugs - $150/animal Rendering - $135/animal
Budget - mainly personnel costs - independent of sea lions removed
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Current Budget
$300K NMFS ODFW provides funding IDFG provided $25K, 2 veterinarians and 2 staff
(2 - 4 wks each)
CRITFC $250K – hazing funds from BPA
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Personnel and Costs
Future efforts Trapping up to 10 months
Spring Trapping, Fall Trapping, Tributaries Include SSLs – equipment needs
Personnel and Costs TBD
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QUESTIONS