What is this part of the kitchen knife used for?

[Robin Lindström]

What is the tooth part on the left side used for?:
https://imgur.com/a/i3hD1pL

The brand is jin ding which is written in smaller print:
https://imgur.com/a/ILF4SYK

 

[Wowbagger]

I'll take a wild freekin' flog at it and say : Fish Scaler.
((?))

 

[Wowbagger]

tooth part

You don't mean the bottle cap opener right ?

 

[Rhinoknives1]

What is the tooth part on the left side used for?:
https://imgur.com/a/i3hD1pL

The brand is jin ding which is written in smaller print:
https://imgur.com/a/ILF4SYK

Yes, a multi-fish knife/scaler for prepping Sushi in your small boat.

 

[KenHash]

Looks like that is a fish scaler.
According to a Chinese site:
"Jinding multifunction knife fish scales planing knife/pig hair clip/stainless steel peeler/kuala shaver /Fruit knife peeler".
LOL..so there you have it. Got to be a scaler.
But it's got nothing to do with "sushi".