Analysis of PIT tags

• 559 tags found at 6 sites: Roza (103 tags), Selah (283 tags at 3 sites – 252 tags at rookery), Sumac Heronry (53 tags) and Chandler (120 tags).

• 69% were from 2005-2006, but tags went back to year 2000, representing a total of at least 11,771 estimated smolts consumed 2000-2006.

  • 171 coho tags representing 6,240 estimated smolts (53%)
  • 276 spring chinook tags representing 4,388 estimated smolts (37%)
  • 95 fall chinook tags representing 1,100 estimated smolts (9%). Yakima River, Columbia River (Priest Rapids) and Umatilla River represented.
  • 6 steelhead tags representing at least 31 estimated smolts (Toppenish & Ahtanum Creeks, Snake & Methow Rivers, Chandler reconditioned kelts). 12 tags unidentified to species (possibly reused tags).

• Further analysis assumes equal biases across sampling sites: tag deposition and recovery rates, other assumptions.

Notes: