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BSAI Arrowtooth flounder maturity-at- age

BSAI Arrowtooth flounder maturity-at- age. Ingrid Spies. Parameters. Zimmerman 1997 (length-based maturity): GOA September (1993). Stark 2011 (age-based maturity): BSAI February 2008. Reasons to update maturity.

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BSAI Arrowtooth flounder maturity-at- age

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  1. BSAI Arrowtoothflounder maturity-at-age Ingrid Spies

  2. Parameters • Zimmerman 1997 (length-based maturity): • GOA September (1993). • Stark 2011 (age-based maturity): • BSAI February 2008.

  3. Reasons to update maturity • Age-based estimates are less variable than length-based estimates of maturity. • Samples taken from BSAI (n=175).

  4. GOA Sample locations September 1993 February 2002 July 2003 +

  5. BSAI Sample locations ATF Samples February 2008

  6. Stark 2011: fish mature at younger ages

  7. Stark (2011): Younger maturation results in lower female spawning biomass

  8. Stark (2011): Younger maturation results in (slightly) lower total biomass

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