Fish Population Trends, Gaged Streamflow, and Maximum Juvenile WUA

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Fish Population Trends, Gaged Streamflow, and
Maximum Juvenile WUA
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Lemhi River Subbasin (HUC 4)
Salmon, ID
Lemhi at L-5 Gauge
Screw Trap
Lemhi at Lemhi Gauge
Lemhi at McFarland Campground Gauge
Leadore, ID
Hayden Creek Drainage
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Possible Causes?

• Mean column vs. nose velocities (Probably not,
  but had to list it).
• Incomplete interpretation of juvenile salmon
  habitat and use behavior due to daytime
  sheltering in summer (Gries and Jaunes 1998).
  Maybe true for rainbow/steelhead too (Ebersole et
  al. 2001).
• Incomplete interpretation of juvenile salmonid
  habitat and use behavior due to underestimation
  of diurnal movements (Schmetterling and Adams
  2004).
• Underestimated importance of cover associated
  with banks. Importance of near/under bank cover
  (Brusven, et al. 1986 White 1991).
• Habitat suitability criteria (HSC) developed from
  frequency-of-use data are missing something
  important (Baker and Coon 1997).

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Possible Solutions?

• Habitat suitability criteria based on foraging
  models (Baker and Coon 1997). Description of a
  foraging model (Nislow et al. 2004). How?
• Incorporate nearest (or most applicable) fish
  population/gage data into studies. Develop
  monitoring and adaptive management plans
  (Castleberry et al. 1996).
• Find all sheltering fish and/or look at night???
• Reevaluate importance of cover associated with
  stream banks?

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What about migration?
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References

• Brusven, M.A., Meehan, W.R., and Ward, J.F.
  1986. Summer use of simulated undercut banks by
  juvenile chinook salmon in an artificial Idaho
  channel. N. Amer. J. Fish. Mgmt. 632-37.
• Baker, E. A. and T. G. Coon. 1997. Development
  and evaluation of alternative habitat suitability
  criteria for brook trout. Trans. Am. Fish. Soc.
  12665-76
• Castleberry, D. T., J. J. Chech Jr., D. C. Erman,
  D. Hankin, M. Healey, G. M. Kondolf, M. Mangel,
  M. Mohr, P. B. Moyle, J. Nielsen, T. P. Speed,
  and J. G. Williams. 1996. Uncertainty and
  instream flow standards. Fisheries 21(8)20-21.
• Ebersole, J.L., Liss, W.J., Frissell, C.A. 2001.
  Relationship between stream temperature, thermal
  refugia and rainbow trout Oncorhynchus mykiss
  abundance in arid-land streams in the
  northwestern United States. Ecology of
  Freshwater Fish 10 1-10.
• Gries, G. and Juanes, F. 1998. Microhabitat use
  by juvenile Atlantic salmon (Salmo salar)
  sheltering during the day in summer. Can. J.
  Zool. 76 1441-1449.

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• McKinney, T., D. W. Speas, R. S. Rogers, and W.
  R. Persons. 2001. Rainbow trout in a regulated
  river below Glen Canyon Dam, Arizona, following
  increased minimum flows and reduced discharge
  variability. North American Journal of Fisheries
  Management 21216-222.
• Mitro, M.G., Zale, A.V., and Rich, B.A. 2003.
  The relation between age-0 rainbow trout
  (Oncorhychus mykiss) abundance and winter
  discharge in a regulated river. Can. J. Fish.
  Aquat. Sci. 60 135-139.
• Nislow, K.H., Sepulveda, A.J., and Folt, C.L.
  2004. Mechanistic linkage of hydrologic regime
  to summer growth of age-0 Atlantic salmon.
  Trans. Amer. Fish. Soc. 133 79-88.
• Schmetterling, D. A. and S. B. Adams. 2004.
  Summer movements within the fish community of a
  small montane stream. North American Journal of
  Fisheries Management 241163-1172.
• White, R. J. 1991. Resisted lateral scour in
  streams-Its special importance to salmonid
  habitat and management. American Fisheries
  Society Symposium 10200-203.