With Vieja (and its looking more and more every day) it is often a process of elimination.
V melanura has a broken band along the lateral line, that only runs half way to the gill plate.
Below melanura,, so probably not melanura
View attachment 1471416.
In V bifasciatta there is a blotch above the lateral line, below
View attachment 1471417
Breidhori, no visible lateral belt in normal color
View attachment 1471418
This leaves V hartwegi, fenestrata, zonata, and guttalata. (I kept these before I started using a camera)
True V hartwegi have an overbite, and the band runs gill plate to caudal
Beside the horizontal band, normal V fenestrata have 6 vertical bars.
V zonatum is a possibility, although by 6 " mine were quite bright blue above the lateral line.
V guttalatus is also a possibility.
Whatever it is, it looks female at this point.
All reach over 10" (even females)
There is also the possibility of being hybrid, which often washes colors out, and caamoflagges normal ID traits.