Many people find filleting over-the-ribs to be a bit more difficult than using a rib-in technique. It helps if you have a good understanding of the anatomy of the fish with respect to the ribs and the pinbones.
This video tutorial explains how the pinbones are attached to the ribs and gives some general tips on filleting over the ribs.
The key thing to remember is that in order to fillet over the ribs you need to cut through the pinbones but not the ribs themselves.
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