They are cannibalistic and territorial as previously commented. Crab farming exists differently vs fishes, they are held in individual ‘hotel boxes’ in a RAS setup (closed loop recirculating water).
https://www.ras-aquaculture.com/free-mud-crab-farming-ebook?gclid=Cj0KCQiA3eGfBhCeARIsACpJNU9SJRJMEpyTNfsVQ1LqmVtn-DnaG2gIqfjMFCpcwOvijQDqYmovl8caAv-FEALw_wcB
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