weight_by_catch {Tivy} | R Documentation |
Weight length frequencies by total catch
Description
Scales observed length frequencies based on total recorded catch using length-weight relationship.
Usage
weight_by_catch(frequency, catch, length, a, b, silence_warnings = FALSE)
Arguments
frequency |
Numeric vector of observed length frequencies. |
catch |
Total catch amount (in kg or tons). |
length |
Numeric vector of lengths corresponding to frequencies. |
a |
Coefficient of the length-weight relationship. |
b |
Exponent of the length-weight relationship. |
silence_warnings |
Logical. Suppress warning messages. |
Details
Catch weighting is used to estimate the size composition of catches when only sub-samples are measured for length frequency analysis.
Value
Numeric vector of weighted frequencies.
References
IMARPE (2020). Protocolo Elaboración de la Tabla de Decisión para la determinación del Límite Máximo Total Permisible por temporada de pesca en la pesquería del stock norte-centro de la anchoveta peruana. IMP-DGIRP/AFDPERP, Edición: 05, Revisión 00, 40p.