Why Colors Shift
Warm water = faster metabolism = more pigment production. Guppies look their brightest at 80°F.
Cold water (below 74°F) slows pigment synthesis. Colors look faded or dull.
Breeding Implications
Raise temperature to 80-82°F during breeding season for maximum color expression.
Lower temperature slightly during off-season to extend lifespan and rest breeders.
Photo Period Effects
Longer daylight brings stronger color. 12-14 hours of light during active season is ideal.
Shorter light cycles slow color development — useful for managed breeding schedules.
Warning Signs
Sudden color loss within 24 hours is NOT seasonal — it is disease or water shock. Test parameters immediately.
Slow gradual fade over months with no other symptoms is usually seasonal or aging.