Cris Bessette wrote:Regarding pond oxygen levels, this seems to be a very informative article:
Usually oxygen depletion
in a sportfishing pond is the result of overstocking, over-
feeding, over-fertilization, chemical treatment of aquatic
weeds or pollution from barns and feedlots. These man-
agement problems coupled with hot summer weather,
summer storms, cloudy weather or strong winds can
cause oxygen depletion. In the long run, it is probably
more economical for the sportfishing pond owner to cor-
rect the management problem rather than compensate
for the problem with supplemental aeration.
Rob Irish wrote:
Do larger fish help with circulation of water in ponds that assist smaller fish? I think all the larger fish have been fished out, or died off.
Regarding chemicals to improve ponds, I've come across a few pond treatment services even putting in blue dyes into the ponds to allow less sunlight and photosynthesis and create more beauty. I'm guessing that isn't permaculture, but some of them do look like crystal clear blue lagoons.