Cleaning Fish- Freshwater Fishing
From Ronnie Garrison, former About.com Guide
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Slit the Belly To Guide Your Cut
Slit the belly of the fish
4. Flatten the fish out on the board and make a slit through the belly of the fish, from just under the jaw down past the anal fin. I like to cut on either side of the anal fin - this helps guide the knife later. You need a sharp tip on your knife for this step.