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Northwest Sardine Survey (NWSS) Aerial Sardine Survey Plan for 2011 Northwest Sardine Survey, LLC (Jerry Thon, Prin

Northwest Sardine Survey (NWSS) Aerial Sardine Survey Plan for 2011 Northwest Sardine Survey, LLC (Jerry Thon, Principal) Science Advisor: Tom Jagielo . Background. Pilot Study in 2008 - Northwest Funded by NWSS Method Approved by STAR Panel for use in PFMC Stock Assessments

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Northwest Sardine Survey (NWSS) Aerial Sardine Survey Plan for 2011 Northwest Sardine Survey, LLC (Jerry Thon, Prin

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  1. Northwest Sardine Survey (NWSS)Aerial Sardine SurveyPlan for 2011 Northwest Sardine Survey, LLC (Jerry Thon, Principal)Science Advisor:Tom Jagielo

  2. Background • Pilot Study in 2008 - Northwest Funded by NWSS Method Approved by STAR Panel for use in PFMC Stock Assessments • Aerial Survey in 2009 - Coastwide Funded by proceeds from EFP: NWSS and CWPA • Aerial Survey in 2010 - Coastwide Funded by proceeds from EFP: NWSS and CWPA • Plan for 2011 - Coverage off WA and OR To be funded by proceeds from EFP: NWSS

  3. 2011 Aerial Survey Objectives • Conduct an aerial survey of Pacific sardine to obtain a third biomass data point using this method – Survey area off WA and OR. • Conduct point sets over a broad area (these are used to relate the aerial survey to biomass). • New stratification to help reduce the CV of the biomass estimate from the aerial survey.

  4. 2011 Aerial Survey Design • Stage 1 Sampling: Aerial Survey Transects 41 Transects off Washington and Oregon Transects oriented E/W - Two strata: 7.5 nm and 15 nm spacing • Stage 2 Sampling: At-Sea Point Sets 76 Sampled Schools Distributed by Size: Size bins range from 100 m2 to 10,000 m2 (4-82 mt) • Biomass and CV are estimated from the transect and point set data

  5. Aerial Survey Coverage Southern Area -- Tillamook, OR to CA Border -- 11 Transects – 15 nm apart Cape Flattery to OR/CA Border – 41 Transects Northern Area -- Cape Flattery to Tillamook, OR -- 30 Transects -- 7.5 nm apart

  6. Typical Pattern of School Distribution

  7. 2011 Aerial Survey Logistics • 4 EFP Permitted Purse Seine Vessels • Three Survey Aircraft • Aircraft are equipped with FMC Digital Aerial Photography Data Acquisition System

  8. Biological Sampling • Point Sets are sampled for: • Length • Weight • Maturity • Age (otoliths) • N = 50 fish, taken from unsorted catch at beginning, middle, and end of delivery as it is pumped

  9. Relating School Surface Area to School Biomass

  10. Some Exceedingly Large Schools Have Been ObservedTransect No. 6 8-22-2009 Photo 258 School Area = 504909.7 m² School Biomass = 3911.3 mt

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