The white handled knives made by Dexter Russel are about the best i've found.

The best way to keep them in good working order is to keep a sharpening steel around.
If you get rust spots just take a mild abrasive pad and viola' the spots dissapear.

Keep 2 knives one for bait cutting and GP boat uses and one that is your filet baby.
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Rick
Dont forget your Baitboy