How big do knivefish get?

[rust9000]

Hi i was wondering how big:
1-clown knife
2- royal clownknife
3- black goast knifefish.
get
Thanks.

 

[Vitaliy]

Clown Knife - 36"
Royal Knife - 32"
Black Ghost Knife - 20"
African Knife - 12"

 

[rust9000]

Thanks alot.

 

[Filthy Sanchez]

What species of knife fish are the smallest, the African knife or is there a smaller species?

 

[Thomascl]

I would say African knife

 

[guppy]

There are several species of knives that are smaller than the African, As far as I know the smallest is Hypogus lepturus, it reaches a maximum of 3 3/4" long.