Here is a photo of a school of Zebra Fish, Girella zebra at ‘Kaurna Pool’ (at Lady Bay, Normanville) during a snorkel that I did there on 11th December 2022: –
Note that a lower left, leading fish has different belly bars (like a V), and one at far right also has aberrant mid-body bar pattern.
I suspect that I’m seeing these aberrant bars more often lately.
Here are cropped images showing the two Zebra Fish close-up: –
Although I don’t know the explanation for the colour pattern of these two Zebra Fish in this photo, I assume that they’re normal, minor genetic variations/expressions, possibly with accelerated natural selection to due rapid climate change.
These Zebra Fish have a normal body bar pattern: –