Yawn!

[MHunt]

For me it's between my Goldfish, and my apisto for the biggest yawn.

 

[ox5477]

I dont know if its a tired thing persay, its more like what our true purpose of a yawn is, to get more oxygen in our body. When we get tired, our breathign slows down and when our body feels we are running a little on thin side, it will make us yawn to get more oxygen. Its prob the same for the fish. If they just ate or have been chasing around a potential mate, they may do this to get more water flow through to the gills to increase their blood oxygen concentration. I guess thats just my scientific view, sorry if I ruined a fun thread