Yes my koi reproduce every year. All it takes is maintaining good water quality and providing adequate cover (plants, cracks between rocks etc .) to keep the fry from being eaten. Otherwise you have to use spawning mats and then remove the fertilized eggs from the pond and raise the fry in a separate fish tank until they are big enough to survive in the pond. For more information on koi and backyard fish ponds check out my link
In large ponds (1 acre plus) reduce prolific plants like blanket weed so that the daily pH "high" can be countered by the nightly pH "low". Lily beds will help shade out the blanket algae. On smaller ponds there are some treatments that you can purchase and apply on a regular basis. These are normally far too expensive for larger ponds.
1/11th of an acre = 0.09090909090909091
I guess if you consider a puddle of liquid on the ground to be a pond, you could get over a dozen ponds out of a gallon of gas, or you could just pour out the whole gallon out in one big pond!!! How many key lows are there?
1 acre = 43,560 square feet of area. The cost depends on the location of the acre, and on its surroundings.
1 acre = 4,046.8564 square meters
1 acre = 2.529285264 rai
1 acre = 40.47 are
Koi Anunta is 5' 4 1/2".
1 acre = 4840 sq yards
1 acre = 4,046.86 square meters
1 acre is around 4.1km²
1 acre = 40.5 ares