Slide show - Salmon

  • Fish Passage - After 102 years of blockage at the Landsburg Diversion Dam, Chinook and coho salmon began recolonizing the Cedar River above the dam after a fish ladder opened in 2003. The rectangular openings in the cement wall to the left of the dam are where fish enter the ladder.
  • Fish Sampling - In the fish ladder Chinook and coho salmon are sampled for size, sex, and genetic information. Knowing the genetic identity of each salmon spawning above Landsburg is how researchers can distinguish returning spawners born above Landsburg from strays born below the dam.
  • Chinook Spawning - This Chinook female salmon is building a redd in the Cedar River, 11 miles upstream of Landsburg. She spent more than a day digging a pit and flushing out fine sediment. After she lay her eggs, a male salmon fertilized them.
  • Sign of Success - This juvenile Chinook salmon was one of the first offspring to be born in the Cedar River above Landsburg in over 100 years. Most juvenile Chinook migrate downstream in the first few months after they emerge from a redd (Photo by Peter Kiffney, NOAA Fisheries).
  • Improving Habitat - Juvenile coho salmon often use habitat created by large woody debris in the stream. Restoring large woody debris in stream channels is one of the restoration actions the City of Seattle is taking to improve salmon habitat in the Cedar River watershed.
  • PIT tag antenna - To study the growth, survival, and migration of juvenile salmon, researchers implant PIT (passive integrated transponder) tags in fish. The tags, about the size of a grain of rice, are detected by antennas, such as these located in the Cedar River just above Landsburg.