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A 4-month trial was carried out in Northern Italy to evaluate the possibility of recycling pig manure through pond carp production. Six ponds (600 m 2 , 1.2 m deep) were stocked at the rate of 5300 fish/ha with a mixture of common and grass carp (87% and 13% by number, respectively). The initial mean weight was 450 g (carp) and 440 g (grass carp). Ponds were fertilized with pig manure and/or...
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