5 days post fertilization. Conjoined along the ventral surface (belly to belly around a common yolk). No mouth visible. Each eye is for one head, the other eyes are on the back side. As far as I can tell this is the first image of conjoined twin ranchu on the net.
More images here as the are available:
http://goldfishgarage.blogspot.com/2014/04/mirror-image-conjoined-twin-topview.html
[video=youtube;Z8BzMcmdbLk]https://www.youtube.com/watch?v=Z8BzMcmdbLk[/video]
