IMO, anything with 1/4" profile (blade width) should be removed for consideration as well.

1/4" is nice for many things, but carving on a fish ain't one of them.

Per the earlier comment that 8" might be a bit much, that ejects the 9" non-catalog "Filet Knife" from the list, too.

The 5" model 10 would be *real* nice with the thin 1/8" blade stock. Probably not too many options available for that knife, though.

I agree with RamKingJC, the #7 with the #6 grind would be a great build for a fisherman knife.