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Retrieve Bayesian Length-Weight Equation from FishBase

find_lw.Rd

This function retrieves the Bayesian length-weight equation parameters for a given species from FishBase. It fetches data from the FishBase website and parses the Bayesian length-weight parameters including the mean (m), standard deviation (sd), and the metric used.

Usage

find_lw(sp, mirror = "us")

Arguments

sp

A character string representing the species name. The species name should be provided as it appears on FishBase, but spaces will be replaced with hyphens.

mirror

A character string specifying the FishBase mirror site to use. Defaults to "us" (FishBase USA). Other mirrors can be specified if needed.

Value

A data frame containing the Bayesian length-weight parameters for the species. The data frame includes the following columns:

  • species: The species name.

  • lwa_m: The parameter for the length-weight equation (a).

  • lwa_sd: The standard deviation of the parameter for the length-weight equation (a).

  • lwb_m: The parameter for the length-weight equation (b).

  • lwb_sd: The standard deviation of the parameter for the length-weight equation (b).

  • metric: The metric used for length measurement (e.g., "based on LWR estimates for this species & (Sub)family-body").

If there is no internet connection or if the species page cannot be retrieved, the function returns NULL.

Examples

# Retrieve Bayesian length-weight parameters for a species
lw_params <- find_lw("Lutjanus campechanus")
#> Couldn't resolve host name [www.fishbase.us]: Could not resolve host: www.fishbase.us
print(lw_params)
#> NULL