Originally Posted by jonnyenglish
I'll be planting with oxygenating water-weeds into manageable baskets to help the fish, but also might consider a pump
of sorts, hidden behind rocks and logs to circulate water and add more oxygen.. they are pretty cheap to run really, just stick it on a timer so that it only runs during the day
. If it means not having a stagnant green pond with upside-down fish floating on top, then that's the way to go!
Mate, we (the extended Thai Family) are Fish Farmers.
Without going into great details if you have a gentle ripple on the ponds surface there will be usually sufficient aeration of the pond.
O2 saturation levels depend, amongst other things on the ambient Water/Air temperature and the time of day.
The point of lowest O2 saturation is just before dawn ... so that's when you want your pump running.
If you want some fish for eating, monosex Tilapia or Catfish are the easiest and Catfish don't worry much about O2 levels.
Be carefull of the locals ... they'll nick the lot the night before you harvest them!