Amacore goes fish filleting Posted on December 12, 2014 at 8:26 am. By email@example.com Categories: Amacore news. Tags: amacore, Fish Filleting, Koelewijn, Spakenburg. We at Amacore are always, literally, in touch with our fish. Our sister company Koelewijn Seafood invited us to their office and production facility in Spakenburg, The Netherlands. There we spent the afternoon fish filleting.