TRENDS IN PARASITIC COPEPOD INFECTION AMONG JUVENILE SALMONIDS IN WVP RESERVOIRS Principal Investigators: Fred R. Monzyk Jeremy D. Romer Ryan Emig Thomas.

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Presentation transcript:

TRENDS IN PARASITIC COPEPOD INFECTION AMONG JUVENILE SALMONIDS IN WVP RESERVOIRS Principal Investigators: Fred R. Monzyk Jeremy D. Romer Ryan Emig Thomas A. Friesen Oregon Department of Fish and Wildlife Corvallis Research Lab Corvallis, Oregon

Background Adult ♀ d to hatch Infectous free- swimming stage (live for ~2 d) Re-attaches to tissue (4 -14 d) Can produce 2 broods Eggs CopepodidChalimus stages (1-4) Life Cycle Salmincola californiensis only infect Oncorhynchus spp. Endemic to PNW freshwater habitats Can cause physical damage to gill structure/mortality Incidence of infection tends to increase with fish size

Objectives  Compare infection levels between stream-rearing and reservoir-rearing Chinook  Compare susceptibility to parasitic copepods among Oncorhynchus species in reservoirs  Evaluate changes in infection through time  Prevalence and Intensity on gills

Methods  All fish collected were examined macroscopically for ♀ copepods on gills and fins Counted copepods on subsample of fish  Screw traps, gill nets, electrofishing, seining Detroit, Foster, Cougar, Lookout Point, and Fall Creek (USACE)

Results Infection Prevalence much greater in reservoirs compared to streams Subyearling Chinook Attached to gills Reservoirs: 80% Streams: 19%

Results Chinook are more vulnerable to infection Factors could be habitat, behavioral (feeding, schooling), or evolutionary (immunity) Detroit % 28% 1%

Results 16-24% of Fall Creek Chinook >20 copepods 85% mortality during saltwater transition (Pawaputanon 1980) Subyearling Chinook in Nov-Dec + +

Results Lower infection levels in Lookout Point Higher infection levels in Fall Creek Reservoir Infected adults Fall Creek Steelhead and Chinook adults (Mar-Sep) Released near or in reservoir Lookout Point Chinook release >30km above reservoir Late arriving adults Gold Creek

What can be done? Infected adults  Don’t release infected adults near reservoir o Not feasible in many WVPs  Treat adults prior to transporting o Ivermectin gavage (Johnson and Heindel 2001)-IDFG Individual fish handled at least twice o H 2 O 2 (Hydrogen peroxide) Design Fall Creek AFF with holding pool and bioswale/settling pond o Possible added benefit of < PSM Resolve necrosis of gill tissue

Acknowledgments Doug Garletts Chad Helms Greg Taylor Todd Pierce Nat Erickson Terri Berling Rich Piaskowski Jeff Ziller Kelly Reis The ‘Reservoir Dogs’ Khoury Hickman Chris Abbes Andrew Nordick Greg Gilham Meghan Horne-Brine John Elliott Kevin Stertz Ryan Flaherty JD Hansen

Questions?