• The optimum temperature to fatten and grow trout ranges between 13 and 21 degrees centigrade ( 56º through 70º F).
• The maximum amount of saturated oxygen in the water required to survive is from 5 to 6 parts per million. Normally, it must have from 9 to 11 ppm, which is almost the total saturation possible (14 ppm).
• Alkalinity (PH) is another significant factor, as fish will not breed outside the range PH 7-8.
• Trout are sensitive to color. Brown and rainbow trout can perceive light absorption ranges in the spectrum which are totally invisible for us (350 nanometers {350 x10e-9m}).