body-composition: Body Composition Functions for FB4 Model

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

Body Composition Functions for FB4 Model

Description

Functions for estimating and updating fish body composition (water, protein, ash, fat) and energy density from total wet weight. Composition is estimated via the allometric regressions of Breck (2014):

\log_{10}(\text{Component}) = \alpha + \beta \cdot \log_{10}(H_2O)

Fat is obtained by subtraction and bounded to biologically plausible limits. Energy density is computed as a weighted sum of fat and protein energy contents (J/g).

Value

No return value; this page documents the body composition functions module. See individual function documentation for return values.

References

Breck, J.E. (2014). Body composition in fishes: body size matters. Aquaculture, 433, 40–49. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1016/j.aquaculture.2014.05.049")}

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