weight_by_catch

Scales observed length frequencies based on total recorded catch using length-weight relationship.

Specialized toolkit for processing biological and fisheries data from Peru's anchovy (Engraulis ringens) fishery. Provides functions to analyze fishing logbooks, calculate biological indicators (length-weight relationships, juvenile percentages), generate spatial fishing indicators, and visualize regulatory measures from Peru's Ministry of Production. Features automated data processing from multiple file formats, coordinate validation, spatial analysis of fishing zones, and tools for analyzing fishing closure announcements and regulatory compliance. Includes built-in datasets of Peruvian coastal coordinates and parallel lines for analyzing fishing activities within regulatory zones.

Hans Ttito

Tivy

Toolkit for Investigation and Visualization of Young Anchovies

weight_by_catch function

<dl><dt>frequency</dt>
<dd>Numeric vector of observed length frequencies.</dd>
<dt>catch</dt>
<dd>Total catch amount (in kg or tons).</dd>
<dt>length</dt>
<dd>Numeric vector of lengths corresponding to frequencies.</dd>
<dt>a</dt>
<dd>Coefficient of the length-weight relationship.</dd>
<dt>b</dt>
<dd>Exponent of the length-weight relationship.</dd>
<dt>silence_warnings</dt>
<dd>Logical. Suppress warning messages.</dd></dl>

Arguments

Weight length frequencies by total catch — weight_by_catch

<dl>

<dt>frequency</dt>
<dd>Numeric vector of observed length frequencies.</dd>


<dt>catch</dt>
<dd>Total catch amount (in kg or tons).</dd>


<dt>length</dt>
<dd>Numeric vector of lengths corresponding to frequencies.</dd>


<dt>a</dt>
<dd>Coefficient of the length-weight relationship.</dd>


<dt>b</dt>
<dd>Exponent of the length-weight relationship.</dd>


<dt>silence_warnings</dt>
<dd>Logical. Suppress warning messages.</dd>

</dl>

weight_by_catch: Weight length frequencies by total catch

Description

Usage

Value

Arguments

Details

References