calculate_egestion: Calculate daily egestion (Mid-level - Main function)

In fb4package: 'Fish Bioenergetics 4.0' Model Implementation with High-Performance 'TMB' Backend

Calculate daily egestion (Mid-level - Main function)

Description

Main egestion calculation function called from simulation loop

Usage

calculate_egestion(
  consumption,
  temperature,
  p_value,
  processed_egestion_params
)

Arguments

consumption	Consumption (J/g)
temperature	Water temperature (deg C)
p_value	Proportion of maximum consumption (p_value)
processed_egestion_params	List with processed egestion parameters

Value

A non-negative numeric scalar giving the daily egestion rate in J per g fish per day. Returns 0 when consumption is zero. The equation used depends on processed_egestion_params$EGEQ (1 = constant fraction; 2-3 = temperature- and ration-dependent; 4 = temperature-dependent only). The result is always capped at consumption (egestion cannot exceed intake).

Examples

# EGEQ 1: constant fraction of consumption
params <- list(EGEQ = 1, FA = 0.16)
calculate_egestion(consumption = 5.0, temperature = 15, p_value = 0.5,
                   processed_egestion_params = params)

fb4package documentation built on May 8, 2026, 1:07 a.m.