Looks like a decent knife, I would be worried about the metal handle, slippage, coldness, etc. Have any idea what steel is used? It looks a little small to be a real fillet knife to me. But you could use the lanyard hole to attach the knife. The sheath looks ok, I would check the stitching and might replace it with a better sheath such as a Kydex one.
I got a:
Kabar USMC: http://www.kabar.com/knives/detail/73
I use this knife for a bow making, and basic woodscraft type stuff as it has the perfect blade length, not too long, but long enough to do batoning etc.
Gerber LMF2: http://www.gerbergear.com/Military/Knives/LMF-II-Knife_22-41400
I just got this knife as a back up in the rare case that my USMC breaks.
and a Rapala fillet knife: http://www.rapala.com/BP708SH1/BP708SH1,default,pd.html?start=7&cgid=rapala-knives-fillet
I got this knife as a gift from my grandparents and haven't used it yet, so I don't know what it is like.
I always have a pair of nail clippers, needle nose pliers with wire cutters and a multitool in my my tackle bag so, I mainly use them for all my cutting/tool needs.