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## Context
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As for smoltification, the maturation is a long and invisible process of energy allocation of individuals. Thorpe et al. (1998) proposed a model of maturation based on a time window evaluation of the rate of change in lipid content and a comparison of a projected lipid content at a given time horizon with a threshold.
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## Modeling
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This approach was implemented in IBASAM and considers genetic variability of maturation thresholds (Piché et al., 2008). For an individual j, the binary indicator Matj was set to 1 when a ProjectedFatTheoryj was above the phenotypic expression pFmidj of the genetically coded threshold of maturation gFmidj (see Section 2.1.7.3). The ProjectedFatTheoryj was calculated as a linear projection of Fatj at the end of the time step (summer for parr, winter for anadromous) dependent on the rate of change in Fatj of the individual over the days of the evaluation window (61 days in spring for parr, 47 days in autumn for anadromous, see Table 1). As explained in SM3, the pFmid used for an individual was depending on sex and location. |
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