IBASAM: (Individual Based Atlantic SAlmon Model) is a simulation model, developed with an individual-based demo-genetic structure and integrating a significant amount of knowledge on [Salmo salar](http://www.fishbase.se/summary/Salmo-salar.html). To enhance realism, IBASAM has been developed in the framework of pattern-oriented modelling with multiple patterns validation at population levels using specific data collected over 15 yrs on the Scorff river, France. The genetic transmission of traits is included to allow evolutionary changes in Atlantic salmon life history.
# MODEL DESCRIPTION
In the river phase, individuals grew in weight according to individual and stage-dependent growth capacity and influenced by water temperature, population density and river flow. Growth increments in weight were then allocated to fat reserves (Fat) or somatic growth through an increase in body length depending on a variable individual propensity to accumulate fat. Survival in the river was phase dependent, with higher mortality for maturing individuals and during winter. The triggering of sea migration was size dependent 6 months before the run. The smoltification process allows an individual that was in the river (‘parr’) to become physiologically ready to run into the sea (as ‘smolt’). The probability of smolting for an individual followed a reaction norm based on its body length.