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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")
print(lw_params)
#>                species   lwa_m       lwa_sd lwb_m     lwb_sd
#> 1 Lutjanus campechanus 0.01445 0.0009540816  2.97 0.01020408
#>                                                                                                                                                           metric
#> 1 a=0.01445 (0.01280 - 0.01632), b=2.97 (2.95 - 2.99)based on LWR estimates for this species (Ref. <A href='../references/FBRefSummary.php?ID=93245'>93245</A>).