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I think they should be in the mud pond by the time they are ready to begin feeding (+/- 3 to 7 days post spawn depending on temperature). My preference is to let them hatch in the fry pond so they do not have to be handled until they are rugged enough to take it.
Others say they like to start feeding them in tanks and move them later. The only rational would be a mud pond which is impossible to manage and do predator control. Even when culturing rotifers, in a tank the fry will never get the quality and diversity of prey that is available in a well-prepared pond.
If the mud pond is full of dragonfly nymphs, predaceous beetles, top minnows, etcetera, then you would want to wait until they are about 3/4 inch, 18 mm.
-steve hopkins
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