Glass Catfish

[Shah301]

Hi,
My glass catfish has white mark on its body. See image for reference. What can be the reason for this?

 

[Alice B]

looks like his lateral line, perfectly normal

 

[Shah301]

Are you sure? As other glass catfish has no such line.

 

[Alice B]

I am not sure - it does appear to be lateral line, but why the others don't have one visible and this one does, I cannot tell you