Nursery ponds require frequent measurements in order to provide an ideal environment, as well as continual water changes to keep conditions clean. this can vary between weekly or biweekly water changes, which involves removing all the dissolved solids and pollutants that are reduced by waste, decaying organic matter, and other toxic chemicals in the water. Without a filter, daily, smaller changes will need to be done. However, a filtration system is able to keep water in better shape between cleanings for a longer time.
A water change involves removing 10% to 15% of the water within the tank or pond each week, adjustments being made for the stocking density and size of the tank or pond. Depending on whether your reservoir is exposed to open air, and how much surface area there is, water loss may already be occuring via evaporation. Planktonic algae is the main feeding source of most fry, any major competition in the way of unwanted weeds or other kinds of algae can reduce the edible variety, and take up valuable oxygen.
