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Processes Mortality
Within each time step, the total mortality of a given school is comprised of predation mortality caused by other schools, starvation mortality, fishing mortality, post-reproduction mortality, and other additional natural mortality rates. These different mortality sources are computed so as to represent quasi-simultaneous processes. OSMOSE also considers competition and stochasticity in the predation process.
Within each time step, OSMOSE considers each pair of schools or sources of mortality in turn, in a random order. To ensure that the random order of the mortality sources and of the schools does not bias the resulting instantaneous mortality rates applied, and effectively corresponds to the mortality rates specified in the input for fishing and additional natural mortality, mortality events are iterated within a time step over a fixed number of sub-time steps.
| Parameter | Description |
|---|---|
| stochastic.mortality.seed | Integer to fix the random number generator |
| mortality.subdt | Number of mortality sub-time steps |
Mortality processes are detailed below.