ypr_sr

Returns a single rowed data frame of the SR parameters:<dl>
<dt>alpha</dt>
<dd>Survival from egg to age tR at low density</dd><dt>beta</dt>
<dd>Density-dependence</dd><dt>Rk</dt>
<dd>Lifetime spawners per spawner at low density</dd><dt>phi</dt>
<dd>Lifetime eggs deposited per recruit at unfished equilibrium</dd><dt>phiF</dt>
<dd>Lifetime eggs deposited per recruit at the fished equilibrium</dd><dt>R0</dt>
<dd>Age tR recruits at the unfished equilibrium</dd><dt>R0F</dt>
<dd>Age tR recruits at the fished equilibrium</dd><dt>S0</dt>
<dd>Spawners at the unfished equilibrium</dd><dt>S0F</dt>
<dd>Spawners at the fished equilibrium</dd>
</dl>

An implementation of equilibrium-based yield per recruit
methods. Yield per recruit methods can used to estimate the optimal
yield for a fish population as described by Walters and Martell (2004)
<isbn:0-691-11544-3>. The yield can be based on the number of fish
caught (or harvested) or biomass caught for all fish or just large
(trophy) individuals.

Joe Thorley

Yield Per Recruit

Ayla Pearson

Poisson Consulting 

ypr_sr function

<dl><dt>object</dt>
<dd>The population or populations.</dd></dl>

Arguments

Returns a single rowed data frame of the SR parameters:<dl>
<dt>alpha</dt>
<dd>Survival from egg to age tR at low density</dd>

<dt>beta</dt>
<dd>Density-dependence</dd>

<dt>Rk</dt>
<dd>Lifetime spawners per spawner at low density</dd>

<dt>phi</dt>
<dd>Lifetime eggs deposited per recruit at unfished equilibrium</dd>

<dt>phiF</dt>
<dd>Lifetime eggs deposited per recruit at the fished equilibrium</dd>

<dt>R0</dt>
<dd>Age tR recruits at the unfished equilibrium</dd>

<dt>R0F</dt>
<dd>Age tR recruits at the fished equilibrium</dd>

<dt>S0</dt>
<dd>Spawners at the unfished equilibrium</dd>

<dt>S0F</dt>
<dd>Spawners at the fished equilibrium</dd>


</dl>

Stock-Recruitment Parameters — ypr_sr

<dl>

<dt>object</dt>
<dd>The population or populations.</dd>

</dl>

ypr_sr: Stock-Recruitment Parameters

Description

Usage

Value

Arguments

See Also

Examples