downstream migrations to consider juvenile/smolt chinook (february-june) yoy coho and steelhead...

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

Dead End/Population Sink

Major Factors to Consider

• Access

• Habitat suitability for particular life history stages

• Predation Rates Question

Habitat Suitability

• Geomorphology

• Season and duration of inundation

• Flow rate of surface and subsurface water

• Water Quality

• Cover (All are interconnected)

Largemouth Bass (YOY) ~ 5650Largemouth (>75mm) - 94Bluegill - 43Carp - 11Redear - 6Golden Shiner – 4Brown Bullhead - 1

Native Species:

Sacramento Sucker - 3Hardhead - 1Blackfish - 1Lamprey - 1

Introduced species: Electro-Fishing Results,Hopkins Pond

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 coho parr migrating downstream for winter habitat?

“We have the knowledge and the know how to use biological criteria…lets use them”

Karr and Chu, 1997Biological Monitoring and Assessment:Using Multimetric Indexes Effectively