Make total spawning migration mortality

Function used to derive total in-river adult survival during the spawning migration from annual mortality and post-spawn survival. This function is not currently implemented in the underlying population model, can be used to estimate numbers of fish lost in freshwater environments for purposes such as nutrient modeling.

Usage

make_s_spawn(nM, s_postspawn)

Arguments

nM

Instantaneous natural mortality rate. A numeric vector containing either an age-invariant natural mortality rate of length 1 or an age-specific natural mortality rate with length = max_age.

s_postspawn

Post spawning mortality calculated from the output of make_iteroparity and nM, or alternatively a numeric vector for each.

Value

A vector of length one containing pre-spawn survival.

Examples

make_s_spawn(0.68, 0.92)
#> [1] 0.8214248