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Spawning Ground Surveys

Spawning Ground Surveys. 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

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Spawning Ground Surveys

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

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