We use a grapefruit spoon to scale with and a sheepsfoot blade to de-fin, gut, and cut the heads off with.

I’m hoping that this knife can be both.
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"Filet that fish? Hell naw! I'll scale him, gut him, fry him up in grease, take him by the head and tail, and play him like a French Harp!" - Uncle Paul sometime in the 60s.