Spawning Ground Surveys

1
Spawning Ground Surveys
2
Past Protocol

• Conducted since 1981
• 27 consecutive years of surveys
• Escapement estimate based on number of redds
• Determine geographic distribution of redds
• Focused on chinook and coho, not steelhead
• Survey locations chosen based on experience and
  access
• Protocol independently developed by MSG with peer
  review

3
New DFG/CMP protocol

• New this year
• Escapement estimate based on redds
• Determine geographic distribution of redds using
  GPS and analyze with GIS
• Still focused on chinook and coho, not steelhead,
  for same reasons
• Survey location selected at random from sampling
  frame
• Consistent protocol across ESU
• Protocol designed by DFG with peer review

4
The Sampling Frame

• Created in GIS
• Separate frames for chinook and coho
• Based on gradient, discharge, historical records,
  and past MSG data
• Reaches are based on existing access points and
  length
• Areas with no access are excluded

5
(No Transcript)
6
(No Transcript)
7
Other Changes

• Two protocols
• Access to HRC lands
• GPS units
• Handheld data loggers