fishgrowth

Fit growth models to otoliths and/or tagging data, using the RTMB package and maximum likelihood.

The otoliths (or similar measurements of age) provide direct observed coordinates of age and length. The tagging data provide information about the observed length at release and length at recapture at a later time, where the age at release is unknown and estimated as a vector of parameters.

The growth models provided by this package can be fitted to otoliths only (or other direct measurements of age), tagging data only, or a combination of the two. Growth variability can be modelled as constant or increasing with length.

Installation

The package can be installed from CRAN using the install.packages command:

install.packages("fishgrowth")

Usage

For a summary of the package:

library(fishgrowth)
?fishgrowth

Development

The package is developed openly on GitHub.

Feel free to open an issue there if you encounter problems or have suggestions for future versions.

The current development version can be installed using:

library(remotes)
# install_github("arni-magnusson/fishgrowth")
install.packages("fishgrowth", repos = c('https://arni-magnusson.r-universe.dev', 'https://cloud.r-project.org'))