Here is 1 of the 4 aquaculture ponds they have at RDIC. I was told they added goat manure for fertilizer (but given the number of goats I saw etc I will assume that the fertilization was supplementary). They have Tilapia and a few varieties of carp but rely on Silver carp as the cash fish. In one of the ponds (behind me) they had duckweed which they used to feed the other pond(s). One of the biggest problems they have with it is other fish spontaneously appearing in the duckweed pond; they have no idea how, the fish just appear, there is not connection between the ponds its like the fish hoped from one pond to the next, over land.
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