Discoloration on yellow lab

[Coz]

My yellow lab gets a black coloration between his mouth and eye area. The dark color seems to fade from faint to dark. Water params are perfect.

 

[Fishdude3233]

Can't see anything pic is blury

 

[Coz]

After googling the issue it seems this is a pretty common thing they do to show their male dominance

 

[kjacks]

Mine does that too... depending on what you feed it also could be due to the amount of spirulina you feed and domince as well..

 

[Jmedic25]

It's called bearding. Very normal and a sign of dominance. Will vary depending on how he feels like breeding.

 

[haleybeth30]

Interesting, my jewel gets dark greyish look on top of head. I thought it was stress, but could this be it or is this exclusive to mbuna/yellow labs?

https://www.dropbox.com/sc/q0ox3u279qegl5f/-r0b9nq2rZ