You might have a problem in that "live" for food purposes does not necessarily mean "live" for forage use. DD (IIRC) once bought a bunch of live-for-food crawdads which he used to try and stock as forage in a pond. They were apparently past the point of no return and only served as forage for the raccoons.

So your fish might have to eat the prawns "right now."


"Live like you'll die tomorrow, but manage your grass like you'll live forever."
-S. M. Stirling
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