I have the same Russel belt knife that I've carried for the past 40+ years.  I carry it mostly out of habit because truth be known I don't actually use it that much.  I also got a Benchmark folding fillet knife this year which I hope will do the trick.  The most important thing I carry with regards to knives is a DMT Diafold Sharpening stone.  Very small, handy and easy to use.  A dull knife is not only useless but more likely to cause a nasty accident.