I would first run it through a DAF plant using food grade polymers to remove the fat.  Once that was done, I would screen then pass through AFM filters  to remove further bones etc not removed by the DAF then to UF/RO to extract the nutrients or alternatively vacuum evaporation.

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I would first run it through a DAF plant using food grade polymers to remove the fat.  Once that was done, I would screen then pass through AFM filters  to remove further bones etc not removed by the DAF then to UF/RO to extract the nutrients or alternatively vacuum evaporation.