id	- Individual identity
dam	- Identity of mother
sire	- Identity of father
generation - generation (starting from 1)
sex	- Sex. Either 1 (female) or 0 (male)
Xloc	- x coordinate in the spatial grid
Yloc	- y coordinate in the spatial grid
disp_dist - Distance dispersed from mother (dam)
trait_ae  - trait values for tail-fin colour
trait_mee - trait values for body size
trait_mgee - trait values for swimming speed
e_var_1	- 1st environmental measure
e_var_2	- 2nd environmental measure
e_var_3	- 3rd environmental measure
e_var_4	- 4th environmental measure
e_var_5 - 5th environmental measure