Description Usage Arguments Details See Also
View source: R/multi_release.R
Estimate population size from multiple release, single recapture tagging data
1 | multi_release(tags, hauls, pars)
|
tags |
matrix (or dataframe?) where the first column specifies the annual releases and subsequent columns the annual recaptures by release cohort (rows). Note these must be whole numbers |
hauls |
matrix (or dataframe?) where the first column represents the untagged recaptures and subsequent columns the recaptures by release cohort with the first (oldest) cohort to the left and the last (youngest) to the right |
pars |
list of model parameters |
For a Type 1 fishery the adjusted releases are calculate as follows
1) Initial tag-induced mortality is applied
2) Within season recaptures divided by the tag reporting rate are removed
3) Natural mortality and chronic tag loss and tag-induced mortality is applied.
For a fishery that operates throughout the year (Ricker Type 2) fishing and natural mortality competed to deplete the tagged population. The adjusted releases are calculated as follows
1) Initial tag-induced mortality is applied
2) Half of the within season recaptures divided by the tag reporting rate are removed
3) Half of the natural mortality and chronic tag loss and tag-induced mortality is applied
4) The remaining within season recaptures divided by the tag reporting rate are removed
5) The remaining natural mortality and chronic tag loss and tag-induced mortality is applied.
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