RBC is right, you need to start with a good sharp flexible blade. I have a brother in law that catches crappies with zippers on them, there is not way you can clean a fish that fast. Of course, he cleans over a thousand most years. I have a young lady friend a freshman in college majoring in biology preparing to apply to medical school who can unzip them pretty well I think. Probably make a heck of a surgeon.
"Patriotism supporting your country all of the time and and your government when it deserves it"- Mark Twain