multi_release: Multiple tag release estimate of population size

In paulburch/tagr: Tagging models for the estimation of abundance and demographic parameters

Description

Estimate population size from multiple release, single recapture tagging data

Usage

multi_release(tags, hauls, pars)

Arguments

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

Details

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.

See Also

pars

paulburch/tagr documentation built on May 24, 2019, 8:26 p.m.