BSAI Arrowtooth flounder maturity-at- age
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BSAI Arrowtooth flounder maturity-at-age Ingrid Spies
description
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. - PowerPoint PPT Presentation
Transcript of 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
• Age-based estimates are less variable than length-based estimates of maturity.
• Samples taken from BSAI (n=175).
GOA Sample locations
September 1993February 2002July 2003
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BSAI Sample locations
ATF SamplesFebruary 2008
Stark 2011: fish mature at younger ages
Stark (2011): Younger maturation results in lower female spawning biomass
Stark (2011): Younger maturation results in (slightly) lower total biomass
