Parasitic Copepods (Salmincola sp.) and Fish Species Composition in Upper Willamette Reservoirs

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1 Parasitic Copepods (Salmincola sp.) and Fish Species Composition in Upper Willamette Reservoirs Jeremy D. Romer* Ryan Emig* Fred R. Monzyk Oregon Department of Fish and Wildlife Corvallis Research Lab

2 1. Present Observations of Gill Parasites (Salmincola sp.) in Cougar and Detroit Reservoirs. 2. Compare Fish Community Among Upper Willamette Reservoirs. Numbers of Native and Introduced Species Relative abundance Possible effects on juvenile spring Chinook Management implications

3 1. Gill Parasites Screw Trapping Below Cougar Reservoir. 2. Fish Community in Upper Willamette Reservoirs Oneida Traps Gill Nets Boat E-fishing

4 Juvenile Spring Chinook Captured Below Cougar Dam

5 Fork Length (mm) Juvenile Spring Chinook Captured Below Cougar Dam Nov 76% Dec 91% NO Copepods Copepods PRESENT Aug 9% Sep 31% Oct 74% Jul 21% Jun 16-Jul 5-Aug 25-Aug 14-Sep 4-Oct 24-Oct 13-Nov 3-Dec 23-Dec Date

6 Map with snorkeling sites marked above the Res

7 Percent Infected Juvenile Spring Chinook Upstream vs. Downstream of Cougar Res SF McKenzie River N= 87 Below Dam N= 87 N= 689 N= 16 N= 14 N= 32 N=60 N= 417 Jul Aug Sep Oct Nov Dec Month

8 Juvenile Spring Chinook Captured Below Detroit Dam Nov 70% Dec 53% No Copepods Copepods Present Jun 16-Jul 5-Aug 25-Aug 14-Sep 4-Oct 24-Oct 13-Nov 3-Dec 23-Dec Date

9 Map with snorkeling sites marked above the Res

10 Percent Infected S. californiensis from masu salmon (photo S.Urawa) Breitenbush River North Santiam River Below Dam N= 71 S. Edwardsii (Olsson 1969) N= N= 112 N= 9 Sep Oct Nov Dec

11 2. Compare Fish Community Among Upper Willamette Reservoirs. Numbers of Native and Introduced Species Relative abundance Possible effects on juvenile spring Chinook Management implications

12 Species Composition in Upper Willamette Valley Reservoirs Number captured Size (mm) Species Detroit Cougar Lookout Point Min. - Max Native Rainbow Trout (Oncorhynchus mykiss) Cutthroat Trout (Oncorhynchus clarkii) Bull Trout (Salvelinus confluentus) Mountain Whitefish (Prosopium williamsoni) Northern Pikeminnow (Ptychocheilus oregonensis) Sucker (Catostomus spp.) Dace (Rhinichthys spp.) Redside Shiner (Richardsonius balteatus) Sculpin (Cottus spp.) Exotic Kokanee (Oncorhynchus nerka) Bass (Micropterus spp.) Walleye (Sander vitreus) White Crappie (Pomoxis annularis) Black Crappie (Pomoxis nigromaculatus) Bluegill (Lepomis macrochirus) Pumpkinseed (Lepomis gibbosus) Brown Bullhead (Ameiurus nebulosus) Yellow Bullhead (Ameiurus natalis)

13 Detroit Reservoir Detroit Dam Tailrace 178 mm, 7 in. 457 mm, 18 in. Photo: Greg Gilham

14 Species Composition in Upper Willamette Valley Reservoirs Number captured Size (mm) Species Detroit Cougar Lookout Point Min. - Max Native Rainbow Trout (Oncorhynchus mykiss) Cutthroat Trout (Oncorhynchus clarkii) Bull Trout (Salvelinus confluentus) Mountain Whitefish (Prosopium williamsoni) Northern Pikeminnow (Ptychocheilus oregonensis) Sucker (Catostomus spp.) Dace (Rhinichthys spp.) Redside Shiner (Richardsonius balteatus) Sculpin (Cottus spp.) Exotic Kokanee (Oncorhynchus nerka) Bass (Micropterus spp.) Walleye (Sander vitreus) White Crappie (Pomoxis annularis) Black Crappie (Pomoxis nigromaculatus) Bluegill (Lepomis macrochirus) Pumpkinseed (Lepomis gibbosus) Brown Bullhead (Ameiurus nebulosus) Yellow Bullhead (Ameiurus natalis)

15 Cougar Reservoir

16 Species Composition in Upper Willamette Valley Reservoirs Number captured Size (mm) Species Detroit Cougar Lookout Point Min. - Max Native Rainbow Trout (Oncorhynchus mykiss) Cutthroat Trout (Oncorhynchus clarkii) Bull Trout (Salvelinus confluentus) Mountain Whitefish (Prosopium williamsoni) Northern Pikeminnow (Ptychocheilus oregonensis) Sucker (Catostomus spp.) Dace (Rhinichthys spp.) Redside Shiner (Richardsonius balteatus) Sculpin (Cottus spp.) Exotic Kokanee (Oncorhynchus nerka) Bass (Micropterus spp.) Walleye (Sander vitreus) White Crappie (Pomoxis annularis) Black Crappie (Pomoxis nigromaculatus) Bluegill (Lepomis macrochirus) Pumpkinseed (Lepomis gibbosus) Brown Bullhead (Ameiurus nebulosus) Yellow Bullhead (Ameiurus natalis)

17 Lookout Point Reservoir 470 mm, 18.5 in. 755 mm, 29.7 in. USGS 2004

18 Copepods Salmincola prevalence appears to increase with the duration of time spent in reservoirs. Copepod infection seems rare in stream-rearing juveniles. Need information on how copepods affect saltwater transition (physiology, parasitology). Need standardized protocol to record intensity of infection. Are fish infected in the reservoir? Do Salmincola negatively affect survival? Species Composition Large abundance of piscivorous predators in Lookout Point Reservoir. Currently processing diet samples collected in Spring and Fall Drawdown in Lookout Point could decrease abundance of predatory fish. Downstream effects? Detroit Reservoir - Hatchery Rainbow Trout prey on juvenile Chinook stream, reservoir, below the dam

19 Doug Garletts Chad Helms Greg Taylor Rich Piaskowski Randy Wildman Jeff Ziller The Reservoir Dogs Khoury Hickman David Duckett Chris Abbes Dave Metz Kris Clemons Shelly Goff Greg Gilham Mario Minder

20

21 25

22 Number of Dace Captured Degrees Celsius ( C ) Cougar Detroit Lookout Cougar Detroit Lookout Apr May Jun Jul Aug Sept Oct Nov Month 0

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