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At the beginning of each simulation (a 1st of April) a virtual population was created with individuals from each life stages to represent a standard population from the Scorff river (Caudal and Prévost, 2008): 1.2 emerging juvenile/m2 of riffle and rapid equivalent area (RA), 1.32 parr of 1 year/100 m2 RA, 3.61 smolt running to sea/100 m2 RA, 3.61 grilse/1000 m2 RA (1 sea-winter anadromous adult) and 0.6 multiple sea winter individuals/1000 m2 RA. Each individual’s state variable was initialized by drawing from probability distributions describing their variability (see Appendix A). The first simulation step was then a summer.
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# OUTPUT
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Simulated data are analysed at the end of each time step (using [observe()](https://github.com/Ibasam/IBASAM/blob/master/IBASAM/R/observe.R) function; inserted in [demoIbasam](https://github.com/Ibasam/IBASAM/blob/0a80e276155c90c66fe19db7ad2c315796ad6f08/IBASAM/R/demoIbasam.R#L21-L24)) to follow the population evolution at different life stages (smolt at the end of winter, parr and anadromous adult after summer,...). The time spent in river and at sea, the weight and size, the sexual maturity status, the smoltification status, the location, the genetic and phenotypic values of maturation thresholds are recorded for each individual at these observation times.
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Results can be stocked in a data frame:
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``` R
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res <- demoIbasam(10)
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```
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The *res* object contains a list of variables corresponding to individuals characteristics over their life time.
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