I use the PIRAHNA filet knife. I've had Rapalas, manual and electric, and Mister Twisters. T
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Mister Twister Piranha saltwater fish fillet knife heavy duty 110v AC 9 in blade
This one beats the other knives (that I have had) hands down. I've got a BubbaBlade and it is good on bigger fish, but it is a BIG knife.