ABP has secured the stake through the purchase of Benoni Holding Corporation, which previously held an interest in the processor.
JBS will contribute its existing Australia and New Zealand operations to the venture.
Transaction will be funded through existing borrowing facilities and a planned share issue.
The company plans to expand beyond Europe into markets including Singapore, the UK, the US, Canada, Australia and New Zealand.
The initiative aims to build local expertise and expand aquaculture output by 2030.