predator_energy_eq1

Retrieves energy density from pre-calculated daily data.
The function accesses both <code>energy_data[day]</code> (start of day) and
<code>energy_data[day + 1]</code> (end of day) during weight calculations,
so the vector must have n_days + 1 elements (e.g., 366 for a
365-day simulation: indices 1 to 366 represent days 0 to 365).

internal

An implementation of the 'Fish Bioenergetics 4.0' framework
described in Deslauriers et al. (2017)
<doi:10.1080/03632415.2017.1377558>. Provides automated parameter
optimization, multi-prey diet modeling, and comprehensive energy budget
simulations for fisheries research and aquaculture applications. An
optional 'TMB' (Template Model Builder) backend delivers 10-50x speedup
in maximum likelihood estimation while maintaining full backward
compatibility. Includes species-specific parameter databases and tools
for modeling fish growth, consumption, and metabolism under varying
environmental conditions.

Hans Ttito

fb4package

'Fish Bioenergetics 4.0' Model Implementation with
High-Performance 'TMB' Backend

predator_energy_eq1 function

<dl><dt>weight</dt>
<dd>Fish weight (g) - not used in this equation</dd>
<dt>day</dt>
<dd>Simulation day (integer, 1-based)</dd>
<dt>energy_data</dt>
<dd>Numeric vector of energy densities (J/g). Must have
length <code>n_days + 1</code> — one value per day boundary, from the start
of day 1 through the end of the last day. For a 365-day simulation,
provide 366 values. Use <code>approx(..., xout = 0:n_days)</code> or
<code>seq(ED_ini, ED_end, length.out = n_days + 1)</code> to generate this
vector. If only initial and final values are known, use
<code>ED_ini</code>/<code>ED_end</code> in the predator parameters instead.</dd></dl>

Arguments

Energy density from interpolated data - Equation 1 (Low-level) — predator_energy_eq1

<dl>

<dt>weight</dt>
<dd>Fish weight (g) - not used in this equation</dd>


<dt>day</dt>
<dd>Simulation day (integer, 1-based)</dd>


<dt>energy_data</dt>
<dd>Numeric vector of energy densities (J/g). Must have
length <code>n_days + 1</code> — one value per day boundary, from the start
of day 1 through the end of the last day. For a 365-day simulation,
provide 366 values. Use <code>approx(..., xout = 0:n_days)</code> or
<code>seq(ED_ini, ED_end, length.out = n_days + 1)</code> to generate this
vector. If only initial and final values are known, use
<code>ED_ini</code>/<code>ED_end</code> in the predator parameters instead.</dd>

</dl>

predator_energy_eq1: Energy density from interpolated data - Equation 1 (Low-level)

Description

Usage

Value

Arguments