Modeling Natural Mortality in Stock Synthesis Modeling population processes 2009 IATTC workshop.

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Presentation transcript:

Modeling Natural Mortality in Stock Synthesis Modeling population processes 2009 IATTC workshop

M options in Stock Synthesis v3 1.Single value for all ages 2.Broken stick (piecewise linear) where the number of breakpoints can be set 3.Scaled Lorenzen curve where the curve is scaled to an estimable value at a given age 4.Age-specific vector of user-specified fixed values

Broken stick

Age zero Zero exponential offset

More on Mortality Value for males offset from females Can be time-varying like other parameters If broken stick is used (piecewise linear), values before and after range of breakpoints are constant at first/last value

Mortality in seasonal models Mortality is function of real age based on birth season, not calendar age User-specified values have choice of same value for each season within year, or interpolated values for each season

Lorenzen mortality Mortality is a function of mean size at age Parameter for M at user-specified reference age Based on initial growth curve, so does not work well with time-varying growth Ref: Lorenzen, K The relationship between body weight and natural mortality in juvenile and adult fish—a comparison of natural ecosystems and aquaculture. Journal of Fish Biology 49, 627–647

Lorenzen mortality (my guess) b=-0·288