StuRecap: Get Sturgeon Recapture Summary Data.

In jasondubois/sportfish: Methods and Function for CDFW Sportfish Unit Data

Description

The CDFW Sturgeon Mark-Recapture Study annually affixes a single disc tag (mark) to many sturgeon. Sometimes marks from within season or previous seasons are recaptured and the disc number recorded (along with other pertinent data). StuRecap() makes easier the process of getting (for each tag) release year, recapture year, & days-at-large (DAL), along with other metrics. Summary data are then used to construct a frequency table of sorts with the count of tag recaptures (by recapture year) for each release year.

Usage

StuRecap(x, ...)

## S3 method for class 'RecapData'
StuRecap(x, ...)

## S3 method for class 'StuRecap'
StuRecap(x, ..., species = "w", lencat = NULL, minDAL = -1L)

Arguments

x	Object of class 'RecapData' or class 'StuRecap'.
...	Passed to other methods or functions. Currently not used.
species	Scalar characater either 'w' (default) or 'g'. Defines species either White Sturgeon or Green Sturgeon.
lencat	Scalar character with choices 's', 'l', or 'o'. Defines length category for desired subsetting. Sub-legal (s), legal (l), or over-legal (o) are based on length (and existing regulations) at time fish was tagged. Default ('NULL') includes all length categories.
minDAL	Integer. Defines minimum days-at-large post tag & release. Oftentimes it is best (for minimizing biases) when tagged fish mixes with non-tagged fish. Limiting to at least ~30 days-at-large to define a recapture may mitigate biases. Default value (-1L) does not subset for DAL.

Value

List with nine items.

RelYr

4-digit release year

RecYr

4-digit recapture year(s)

RelDate

release date (YYYY-MM-DD)

RecDate

recapture date(s) (YYYY-MM-DD)

DAL

days at large; RecDate - RelDate

LenCat

length category at tagging: sub; leg; ovr

Species

species (either white or green)

DupTag

see note

NRecs

number of records in recapture data

Methods (by class)

• RecapData: for object class 'RecapData'.

• StuRecap: for object class 'StuRecap'.

Note

In 2015, we inadvertently released duplicate tag numbers released in 2011 & 2012. To date, duplicate tags 'HH2141' & 'HH2145' are the only two that have been recaptured. These are handled specially within StuRecap.RecapData() to account for two separate release dates.

Examples

# coming soon.

jasondubois/sportfish documentation built on July 3, 2020, 1:01 p.m.