If molded plastic and dishwasher safe are priority’s. I’d look to Dexter Russel. They have a line called “Sani Safe”. They have everything from bait knives to butcher knives with several filet knives.
Most have white handles but some have nice bright colors available. Made in USA.
They are inexpensive but are far from cheap. Industrial quality knives made for hard use. They take and hold a nice edge.
These are my butcher and large skinner.
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Great knives, that's exactly what they use at work.Dexter Russell Sani-Safe, these are industrial grade commercial food prep knives. Molded handles to meet food prep sanitation standards. I have a 8" Filet and -- I swear, a 6" Boner.
Additionally, I have a 6" Butcher with carbon steel blade and wood (maple?) grip.
http://www.dexterrussellcutlery.com/about-us/
http://www.dexterrussellcutlery.com/product-lines/