Many culling questions; how early, how often, what for?
I have a friend who has three sets of fry and eggs in the breeding pond. The guilty parties were:
1 week ago: a female showa and a male doitsu ochiba
4 days ago: three kohakus; one male, two females -- very high quality
yesterday: two Omosako shiro utsuri
So the showa/ochiba 'junk' fry are already swimming around and are really difficult to see. A bunch of black fish.
The kohaku fry should show up today or tomorrow.
In a few more days the shiro utsuri fry show.
Let's assume that the showa/ochiba fry are junk and not worth saving in any way.
When can we start culling and what should we look for? I'm guessing that we start culling deformities and black fish in a couple of weeks. After that, what is the routine? Can we cull sooner?