Could be wrong, but the knife in the video looks like a Forschner Cimetar, probably a 12 or 14 inch. I have an older F Dick Scimitar with a wood handle that looks much like it that I like for butchering.
Seems to have done the job well.
I think anything over 8" with sharp serrations would help get through the scales, and separate the vertebrae.
Brome
Seems to have done the job well.
I think anything over 8" with sharp serrations would help get through the scales, and separate the vertebrae.
Brome