Bull trout life history

• Considered “glacial remnants”

• Spawn and rear in cold headwaters (< 8 ºC)

• Repeat spawners

• Juveniles stay in natal streams

• • Resident – remain in small streams
  • Fluvial – migrate out to mainstem rivers
  • Adfluvial – migrate out to lakes or reservoirs
  • Anadromous (amphidromous) – migrate out to saltwater but may move in and out of rivers
  • Connectivity important but disrupted in Yakima basin by irrigation impoundments and extractions