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Downstream Migrations to Consider

Downstream Migrations to Consider. juvenile/ smolt Chinook (February-June) YOY coho and steelhead (February- July) Yearling coho and steelhead (November-December ) ------- ----- Yearling fall or spring upstream migrations?. Hanson Ponds. Migration Destination for Rearing Or

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Downstream Migrations to Consider

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  1. Downstream Migrations to Consider • juvenile/smolt Chinook (February-June) • YOY coho and steelhead (February- July) • Yearling coho and steelhead (November-December) ------- ----- • Yearling fall or spring upstream migrations?

  2. Hanson Ponds Migration Destination for Rearing Or Dead End/Population Sink

  3. Major Factors to Consider • Access • Habitat suitability for particular life history stages • Predation Rates Question

  4. Habitat Suitability • Geomorphology • Season and duration of inundation • Flow rate of surface and subsurface water • Water Quality • Cover (All are interconnected)

  5. Introduced species: Electro-Fishing Results, Hopkins Pond Largemouth Bass (YOY) ~ 5650 Largemouth (>75mm) - 94 Bluegill - 43 Carp - 11 Redear - 6 Golden Shiner – 4 Brown Bullhead - 1 Native Species: Sacramento Sucker - 3 Hardhead - 1 Blackfish - 1 Lamprey - 1

  6. 1 Hypothetical Analysis 100,000 square meters optimum coho summer rearing habitat in Dry Creek - 170,000 parr (1.7 fish/m2) + 30 percent will serve as winter rearing habitat- 25,500 smolts (1 fish/m2) Fate of 144,500 cohoparr migrating downstream for winter habitat?

  7. “We have the knowledge and the know how to use biological criteria…lets use them” Karr and Chu, 1997 Biological Monitoring and Assessment: Using Multimetric Indexes Effectively

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