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CASAL2 is a generalised age-structured population dynamics modelling software package that allows flexibility in specifying model structure, population dynamics, parameter estimation, and model outputs. CASAL2 can model population dynamics for an age-structured population using a range of population dynamics observations, including mark-recapture, relative and absolute abundance time series, and age frequency data. CASAL2 does this by implementing an age-structured population dynamics model that can have user defined categories (e.g., immature, mature, male, female, predator, prey, etc.,) to specify the population structure, and a user-defined age range.

CASAL2 is an open source project and contributions are welcomed. The CASAL2 development team can be contacted casal2@niwa.co.nz