[header] How to fillet salmon [title] Rinse the salmon in cold running water. [step] Make sure the fish is completely washed on all sides. [title] Open the belly. 
[step] Place the fish on its side on a large cutting board. Hold the tail down with one hand, and with the other insert a fillet knife into the vent, or the anus, located on the underside of the fish near the tail.