I've got two (serrated and non) and they do go dull very quickly. They're best used for self-defense, if even that, or for cutting soft stuff like fruit (maybe). I don't think a tanto shape is very suited to cleaning a fish, have you checked out the CS Bird and Trout? I've got one of those and it's perfect for fishing use. The edge holds well, and it comes w/ an epoxy coat so you won't have to worry about rust except on the edge. A REKAT Utility might serve the purpose just as well and even better, but you might not want to take it to the water, for fear you might drop it in the water or losing it in an otherwise frustrating manner. They go for $40+, and the CS Bird and Trout is something like $30, and in my opinion, I'd go for the REKAT, but I'd still be uncomfortable. Any way you go, a tanto shape is simply not the right choice. Hope this helps.