calc_phi_simple

calc_NPR

Calculate spawners per recruit by individual stock. Appropriate for a population model with a single
spatial area and an annual time steps, i.e. single season.

Implementation of a next-generation, multi-stock age-structured fisheries assessment model.
'multiSA' is intended for use in mixed fisheries where stock composition can not be readily identified in
fishery data alone, e.g., from catch and age/length composition. Models can be fitted to genetic data,
e.g., stock composition of catches and close-kin pairs, with seasonal stock availability and movement.

Quang Huynh

multiSA

Multi-Stock Assessment

calc_phi_simple function

<dl><dt>Z</dt>
<dd>Total mortality at age</dd>
<dt>fec_a</dt>
<dd>Fecundity at age. Vector</dd>
<dt>mat_a</dt>
<dd>Maturity at age. Vector</dd>
<dt>delta</dt>
<dd>Fraction of season that elapses when spawning occurs, e.g., midseason spawning when <code>delta = 0.5</code>.</dd>
<dt>na</dt>
<dd>Integer, number of age classes</dd>
<dt>plusgroup</dt>
<dd>Logical, whether the largest age class is a plusgroup accumulator age</dd></dl>

Arguments

Simple spawners per recruit calculation — calc_phi_simple

<dl>

<dt>Z</dt>
<dd>Total mortality at age</dd>


<dt>fec_a</dt>
<dd>Fecundity at age. Vector</dd>


<dt>mat_a</dt>
<dd>Maturity at age. Vector</dd>


<dt>delta</dt>
<dd>Fraction of season that elapses when spawning occurs, e.g., midseason spawning when <code>delta = 0.5</code>.</dd>


<dt>na</dt>
<dd>Integer, number of age classes</dd>


<dt>plusgroup</dt>
<dd>Logical, whether the largest age class is a plusgroup accumulator age</dd>

</dl>

calc_phi_simple: Simple spawners per recruit calculation

Description

Usage

Value

Arguments

See Also