EVALUATION OF SEA LION PREDATION IN THE BONNEVILLE DAM TAILRACE
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1 EVALUATION OF SEA LION PREDATION IN THE BONNEVILLE DAM TAILRACE Robert J. Stansell Sean C. Tackley Karrie M. Gibbons Fisheries Field Unit USACE Portland District
2 USACE, ODFW, WDFW, CRITFC, NOAA Objectives/Results Pinniped Abundance Pinniped Predation Deterrent Activities Removal Program Movement Patterns Weight Gain Data
3 Observation Area, Bonneville Dam, N WASHINGTON Hamilton Island Columbia River Robins Island Bradford Island Cascades Island Spillway PH2 Tanner Creek PH1 Primary Observation Area OREGON
4 RESULTS: PINNIPED ABUNDANCE Steller sea lion Eumetopias jubatus California sea lion Zalophus californianus Harbor seal Phoca vitulina
5 Minimum Estimated Pinniped Abundance at Bonneville Dam (Season Total), California Sea Lions Steller Sea Lions Harbor Seals Total Pinnipeds
6 60 Daily Average and Maximum California Sea Lion Abundance, Mean (SD) Maximum Daily California Sea Lion Abundance Year
7 30 Daily Average and Maximum Steller Sea Lion Abundance, Mean (SD) Maximum Daily Steller Sea Lion Abundance Year
8 DAILY CALIFORNIA SEA LION ABUNDANCE, NUMBER OF ZALOPHUS /1 1/8 1/15 1/22 1/29 2/5 2/12 2/19 2/26 3/4 3/11 3/18 3/25 4/1 4/8 4/15 4/22 4/29 5/6 5/13 5/20 5/27 DATE
9 DAILY STELLER SEA LION ABUNDANCE AT BONNEVILLE DAM, NUMBER OF EJU /1 1/8 1/15 1/22 1/29 2/5 2/12 2/19 2/26 3/4 3/11 3/18 3/25 4/1 4/8 4/15 4/22 4/29 5/6 5/13 5/20 5/27 DATE
10 BUILDING STRONG
11 MARCH 1, 2010, 0630 TRAP ONE TRAP TWO TRAPS THREE AND FOUR
12 BUILDING STRONG
13 RESULTS: PREDATION
14 Annual Salmonid Passage and Estimated Consumption by Pinnipeds, Bonneville Dam Year Bonneville Dam Salmonid Passage Expanded Salmonid Estimated Consumption % of Run (Jan 1- May31) Adjusted Salmonid Estimated Consumption % of Run (Jan 1- May31) ,733 1, % ,185 2, % ,804 3, % ,006 2, % ,063 3, % 3, % ,474 3, % 4, % ,543 4, % 4, % ,060 4, % 4, %
15 Salmonid Consumption by California and Steller Sea Lions at Bonneville Dam, Year Expanded Salmonid Consumption CSL Salmonid Consumption per California Sea Lion Maximum # Salmonids Caught by Individual CSL Expanded Salmonid Consumption SSL Salmonid Consumption per Steller Sea Lion , , , * 2, * , , , , * - Observers not trained on individual ID of CSL due to late start.
16 CLEPTOPARASITISM (Stealing Prey) Year Total Steals ZCA From ZCA EJU From ZCA Other ZCA Sal. Take EJU Sal. Take ZCA Adj. Catch EJU Adj. Catch
17 Cummulative Salmonid Catch at Bonneville Dam, Number of Salmonids /1 1/8 1/15 1/22 1/29 2/5 2/12 2/19 2/26 3/4 3/11 3/18 3/25 4/1 4/8 4/15 4/22 4/29 5/6 5/13 5/20 5/27 Date
18 Cumulative Salmonid Counts for Bonneville Dam, Number of Salmonids Jan 8-Jan 15-Jan 22-Jan 29-Jan 5-Feb 12-Feb 19-Feb 26-Feb 4-Mar 11-Mar 18-Mar 25-Mar 1-Apr 8-Apr 15-Apr 22-Apr 29-Apr 6-May 13-May 20-May 27-May Date
19 Daily Passage and Expanded Catch of Chinook and Steelhead by Pinnipeds at Bonneville Dam, Chinook Take Steelhead Take Chinook Passage Steelhead Passage Estimated Take Salmonid Passage Jan 8-Jan 15-Jan 22-Jan 29-Jan 5-Feb 12-Feb 19-Feb 26-Feb 5-Mar 12-Mar 19-Mar 26-Mar 2-Apr 9-Apr 16-Apr 23-Apr 30-Apr 7-May 14-May 21-May 28-May Date
20 Cummulative Observed Daily Sturgeon Catch at Bonneville Dam, Number of Sturgeon Jan 8-Jan 15-Jan 22-Jan 29-Jan 5-Feb 12-Feb 19-Feb 26-Feb 4-Mar 11-Mar 18-Mar 25-Mar 1-Apr 8-Apr 15-Apr 22-Apr 29-Apr 6-May 13-May 20-May 27-May Date
21 Sturgeon Predation at Bonneville Year Dam Tailrace, Observed Catch Estimated Catch Adjusted Catch , ,241 1, * 914 ~1,300 ~1,500 * Through March 10, 2010
22 Estimated Chinook, Steelhead, and Sturgeon Take by Steller Sea Lions at Bonneville Dam, Chinook Steelhead Sturgeon Number of Fish Jan 20-Jan 27-Jan 3-Feb 10-Feb 17-Feb 24-Feb 3-Mar 10-Mar 17-Mar 24-Mar 31-Mar 7-Apr 14-Apr 21-Apr 28-Apr 5-May 12-May 19-May 26-May Date
23 Length Distribution of Sturgeon Taken by Pinnipeds at Bonneville Dam, Number of Sturgeon UNK. <2' 2'-<3' 3'-<4' 4'-<5' 5'-<6' 6'-<7' >7' Size (Feet)
24 Year Total Hours Observed Expanded Pacific Lamprey Consumption Estimate Percent of Total Observed Fish Catch % , % % , % , % , % , % , %
25 RESULTS: DETERRENTS, TRAPPING AND REMOVAL
26 Deterrent Measures at Bonneville Dam, 2010 SLED s and FOG s installed and still effective (No entry into fishways observed after installed). ADD s installed near entrances and activated, no effect noticed. Hazing by USDA (land) and States (boat) continued, limited effectiveness. Trapping and removal program (15 removed in 2009, 11 in 2008).
27 Trapping (ODFW and WDFW) Up to 4 floating traps ODFW and WDFW Located near corner collector outfall at PH2, old Navigation Lock, forebay (C697), Astoria 3 Objectives: Remove Calif. sea lions that meet permit criteria (At Bonn. 5d, seen to take salmon, individually identifiable) Brand, acoustic tag, and release Calif. sea lions not on the list and in 2010 up to 10 Stellers
28 Trapping and Removal Results, In 2008, 6 were trapped and sent to Sea World, 1 died under anesthesia, 4 died from a trap closure incident (3 not on list), 4 were branded and released. In 2009, 4 were trapped and sent to zoos/aquariums, 11 were euthanized after failing health exams, 5 were branded and given acoustic tags and released, 1 was already branded but given an acoustic tag and released. Total of 26 removed to through 2009 from list of 87 (only about 30 still likely to return in 2010). Note 6 additional removed so far as of March 10, 2010
29 Year Removal Program Targeting Biggest Problem Individuals So Far Salmonid Consumption per Removed CSL Salmonid Consumption per Remaining CSL Days Present per Removed CSL Days Present per Remaining CSL
30 Acoustic Antenna Array Locations
31 Acoustic Tracks for C926
32 Acoustic Track for C697
33 Weight Gains for Bonneville Pinnipeds 2 Heaviest California sea lions ever weighed on record were Bonneville animals (1,454lbs, 1,151lbs) C319 weight gain recorded (+339lbs in 5 months) C265 weight gain recorded (+484lbs in 2.5 months) C697 weight gain recorded (weighed April 2009, locked up into forebay May 2009, captured/weighed February 2010, gained about 250 lbs.
34 MAY 2008 ~ Astoria, OR Bonneville residents Astoria residents Photo by M. Tennis
35 Summary - Key points 1. Physical barriers effectively block access to fishways years of active non lethal deterrence efforts failed to reduce predation on salmonids and sturgeon at the dam. 3. Trapping and removal program working for California sea lion abundance, but full benefits not know until after 5 years (ODFW estimates 800 to 1,700 salmon saved so far), but: 4. Steller sea lions beginning to become more of a problem with increasing abundance and more predation on both white sturgeon and salmon species and stealing prey. 5. Salmonid catch totals continue to increase (4,489; 2.4% of run in 2009). Higher if unidentified fish are included. 6. California Sea lions coming earlier each year (some in fall), and having impact on early spring Chinook stocks.
36 I couldn t eat another salmon.i feel sick
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