I keep reading that there are 7.48 gallons in a cubic foot. This does not sound right to me. Anyone want to weigh in on this one?
That's a for a US gallon. If you're using imperial standard it will be less.
I just picture a gallon jug and then a cubic foot and can't see getting any more than 4 in there.
David Waite said:
That is right Cai on the ratio.
Cai Robertson said:I keep reading that there are 7.48 gallons in a cubic foot. This does not sound right to me. Anyone want to weigh in on this one?
I have been raising rainbow trout in Colorado since the fall and we are actually harvesting in two weeks because the water temperature is starting to push 65F on warm days. The coldest the water ever got was 39 degrees in winter and was unheated throughout. You are correct that they require cold water, high DO and good water movement. Proper filtration will also be key and I would minimize the stocking density to at least 1 fish to 10 gallons to be on the safe side. When we stocked in the fall they were between 8 to 10 inches and they are all now between 12 to 14" perhaps longer. They eat aggresively under good system conditions. We fed them a combination of a pelleted food, snails that naturally occured in the system and worms from our vermicomposting setup.
With cold water your bio-filter will be challenged as nitrification slows down significantly. Keep an eye on nitrite levels and if they creep up past .5ppm then eliminate feed for a day and it will go down. Watercress grew really well in this arrangement but many plants will not respond well too the cold water so you have to be selective.
There are many great cold weather crops as long as they get plenty of sun and are not freezing. I found Broccoli, swiss chard and lettuce, did well in my system through winter as well as the water cress of course.