I must revise my understanding about the breeding of blue, brown and purple crossing.

Several weeks ago I crossed semi purple ranchu with semi purple ranchu. What I mean by semi purple is the cross between purple ranchu and red ranchu. The phenotype (outward appearance) is red / red-white / wild color. To refresh our memory, these are the pair I used (female, male, and male):

In my understanding, the result will be as shown in this illustration:

SP = Semi Purple

I mentioned earlier that the result consists of two different visible color: the light colored fry and the dark one. The light colored fry will become purple, and the dark colored one will become grey (which might eventually turn into red / red-white / stay grey). Based on this understanding, I usually cull out the dark colored one.

I have done these crossing with oranda and ranchu several times and I have revised my understanding. The light colored ones do not turn into solely purple, but also brown fish! So, without any crossing back to brown, I get brown color as a bonus. This will make my life easier. I do not need to make the brown as a separate project. But in this revised understanding, I still cull out all the dark colored ones.

This time, when I breed the semi purple ranchu above, I decided to keep the dark color fry. My initial purpose is to see if some of can become my Basic Ranchu Material. To my surprise, as the color become more visible in several weeks, the dark color turn out to be not only grey fish but also blue fish! So, I have been wrong all this time by culling out all the dark ones! So, once again I must revise my understanding to be like this:

Here are the real offspring:

1. purple ranchu
2. brown ranchu
3. grey / green / wild colored ranchu (that might turn into red/red white)
4. blue ranchu

Knowing this, I can simplify my projects. Instead of three projects of blue, brown and purple, I can just do one. The purple project will yield all the three color types I want. Is not that great?

But there is a certain doubt lingers. Why does the semi purple cross produce all the three color types? In my understanding, there is two possible solution:

1. the purple genetics I use is not pure.
2. even the pure purple genetics carries all the three color types with it, which will be reintroduce when being crossed with another fish (in this case a red fish)

Possibility number one is likely to happen, since I crossed my purple to many other color which I did not keep track diligently. I tried to purify the purple by mating purple with purple. I also mated purple with brown, and purple with blue, which yielded several percentage of purple goldfish (which I guess the purple gene is not pure in this case). And I do not know which purple I use to produce the semi purple ranchu above.

So, yes, I cannot answer which one of the two possibility is true. If number 1 is true, then to reduce my three projects into one will only work if I use the impure purple genetics. If number 2 is true, then I can reduce the three into one in all cases. Hopefully someday someone else can clarify this by doing a better experiment with diligent journal.