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Triennial survey design (1983)

Triennial survey design (1983). Primary objective: yellowtail, canary, and hake Two chartered AK class vessels R/V Alaska and F/V Pat San Marie 36° 48′ N to 48° 30′ N, 55-366 m Strata based on commercial catch data 55-91, 92-183, 184-219, 220-366 m

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Triennial survey design (1983)

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  1. Triennial survey design (1983) • Primary objective: yellowtail, canary, and hake • Two chartered AK class vessels • R/V Alaska and F/V Pat San Marie • 36° 48′ N to 48° 30′ N, 55-366 m • Strata based on commercial catch data • 55-91, 92-183, 184-219, 220-366 m • Tracklines spaced every 2 minutes latitude • Stations allocated to depth strata based on trackline length

  2. Triennial survey design (1989) • Primary objective: juvenile sablefish and hake • Previous rockfish variances too high • Two chartered AK class vessels • F/V Pat San Marie and F/V Golden Fleece • 34° 30′ N to 49° 30′ N?, 55-366 m • High density latitude strata • Strata based on commercial catch data • 55-183, and 184-366 m • Tracklines spaced every 18.5 minutes latitude • High density strata had additional tracklines between in the 55-183m depth strata • 1 station/7.4km in shallow strata • 1 station/9.3km in mid and deep strata

  3. Triennial survey design (1995-2001) • Primary objective: sablefish, hake, slope rockfish • “modified design… periodically to collect more detailed information on specific species groups” • Two chartered AK class vessels • F/V Vesteraalen, R/V Alaska • 34° 30′ N to 49° 30′ N, 55-500m • Stratified by depth • 55-183, 184-366, 367-500 m • 119 tracklines spaced every 10 minutes latitude • 1 station/7.4km in shallow strata • 1 station/9.3km in mid and deep strata

  4. Triennial survey design (2004) • Conducted by the NWFSC • Attempted to follow same protocol as previous surveys

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