Monitoring Estuarine Survival of Steelhead (Oncorhynchus mykiss) Smolts in the Nehalem and Alsea Basins, Oregon Using Acoustic Telemetry Jeremy Romer, Camille Leblanc, Carl Schreck, David Noakes, Shaun Clements
Goal : Physiology- Assess degree of smoltification throughout run. Behavior- Assess differences between early and late run groups, between basins, or between years. Survival- Provide estimates of lower river and estuarine survival.
# Nehalem River North Fork Wheeler Manzanita Pacific Ocean Hatchery Nehalem Bay and Surrounding Area Oregon # # # Trap Last count Life Cycle Monitoring: Spatial Resolution
# Nehalem Bay and Surrounding Area Oregon # Trap Last count Life Cycle Monitoring: Spatial Resolution 33 Km
steelhead 2009 Acoustic Technology 7 mm x 18 mm, 0.7 g in water V7 V9
Two (7" x 15", 16 lb) Floats Sonic Receiver 1/2" Poly Crabline 3/8" Galvanized Chain (12') Kedge Anchor - 40 lbs Lead Weight (4 ounce) steelhead 2001
Pacific Ocean
Alsea Study Area OHRC
Nehalem Study Area LCM
Migration Timing
Waldport UpperMidLower % undetected 40 Alsea Study – Possible Mortality 2007, 2009 steelhead 2007,2009
95 (4) 82 (8) 100 = Predator Congregation = Receiver Efficiency
Alsea River Mouth
steelhead 2001,2002, N km Nehalem Study – Possible Mortality 2001, 2002, UpperMidLower % undetected 40
93 (4) 88 (6) 100 = Predator Congregation = Receiver Efficiency
9/31 29% detected 25/39 42% detected Peak Early Alsea - Effect of run timing on survival
21/34 62% detected Nehalem - Effect of run timing on survival
Alsea River (55 Km) Effect of run timing on time to reach the lower estuary N=9N=25 Nehalem River (33 Km) N=15N=21
Alsea Days Mean: 1.1 Median: 0.8 Max: 6.3 Total N: 38.0 Std Dev: 1.3 Nehalem Days Estuary Residence Time
Alsea River Mouth 70 tagged 62 Estuary Entry - 42 Km – 88.6% Pacific Ocean Ocean - 55 Km – 31-54%
South Jetty Pacific Ocean Nehalem River Mouth 69 tagged 53 Estuary Entry - 20 Km % 22-34Ocean - 33 Km – 32-49%
Nehalem (n=38) Columbia (n=64) Distance Travelled (Km) > 41 Days Travel time to Estuary (h) steelhead 2001
Migration through the Columbia Estuary 12:000:0012:000:0012:00 steelhead 2001 Tidal Stage (m) River Km
Spring Chinook r 2 = Mean Daily Flow (kcfs) Mean Rate (kph) Steelhead r 2 = 0.47 Fall Chinook r 2 = 0.46 Migration Rates to Estuary Relation to Flow * *
ANDREW WALCH – because he is a better field tech than the one you have. ODFW Kim Jones – Gear, opportunity, motivation Steve Johnson – Alsea smolt trap setup, receiver tech support, data, advice Brian Riggers – Boat Kara Anlauf - GIS Charlie Stein – Access queries, ocean fishing Dave Stewart – Redwood housing Nehalem Kanani Bowden – Scales Lisa Borgerson – Scales Bill Ratliff – Landowner contacts Ryan Couture – OHRC, coordination Joseph O’Neil – OHRC, maker of things Eric Suring – LCM Project Leader Chris Lorion – Smolt trapping Alsea Derek Wiley – Smolt trapping Nehalem Paul Olmsted – Smolt trap Nehalem Aaron Paloni – Smolt trap Nehalem Jitesh Pattni - Smolt trap Nehalem Richard Biederbeck – Technical support OSU Jayde Ferguson – ATP, Parasites Michael Glynn – ATP assay Allison Evans – Psychotherapy & stats Schreck Lab – for the love of fish EPA Jim Powers – VR2 receivers Landowners Paul McCracken- Nehalem Pat & Bunny Wright – Alsea Richard & Kathy Ellis – Alsea ODFW District Fish Biologists Bob Buckman – Alsea Chris Knutsen – Nehalem NOAA Pete Baki –Permitting Old Man Ocean – for letting us have all of our gear back. ACKNOWLEDGEMENTS