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Stock Synthesis
Stock Synthesis (SS) provides a statistical framework for conducting assessments of exploited fish populations. Tens of fish stocks are assessed each year using this tool. SS is in the class of fish assessment models termed Integrated Analysis, aka Statistical-Catch-at-Age analysis. It is coded in C++ using Auto-Differentiation Model Builder (http://www.admb-project.org). ADMB provides an efficient approach to estimation of the tens to hundreds of parameters that may be defined within a SS application.
SS works by calibration of a population dynamics model using a diversity of fishery and survey data. It is designed to accommodate both age and size structure and with multiple stock sub-areas. Selectivity can be cast as age specific only, size-specific in the observations only, or size-specific with the ability to capture the major effect of size-specific survivorship. The overall model contains subcomponents which simulate the population dynam
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