cow ranchu, Purple goldfish

Cow Projects 2020

This is the second time I breed my cow ranchu. There are two ongoing projects. First, I cross my remaining cow ranchu (male) with his own offspring (or niece – since I used several male to produce her). Second, I cross the same cow ranchu with a female purple ranchu out of curiosity.

The first project (cow x cow) resulted in weak body shape offspring. But it is not my main interest. My interest is in the coloration of the offspring. At the age of roughly three months old, they are still mostly transparent white. Few have red patches. Some have black little dots and / or black patches “inside” (beneath the scale). Black marking on top of the scale (outside) is rare in these offspring. If they do, the black marking is in the shape of patches, not dots.

The fully white ones are nicknamed Casper by my friends. I was informed that these Caspers and the ones with black dots inside will develop the black color outside later on. It is certainly my hope to see it comes true. But so far, I do not see it coming. None of them can be claim as cow ranchu yet.

Let me refresh our memory with the pictures of the parent:

The male cow ranchu
The female

I do this first project twice. So I have collected two batches. Since the first batches were on medication when I took these photographs, I only managed to take pictures of the second batches. And these are the results. Each fish is displayed from left and right side.

The second project (cow x purple ranchu) has a different result. The offspring looks more like calico with a satisfying color composition. To compare this with the above project, this second project does not produce Caspers. They have black patches inside (not dots), but also white dots outside (not patches at this stage). I am eager to see how these dots will develop later on. And to compare with my previous project of crossing the cow with blue ranchu, I do not get any kirin-like color in this crossing (cow x purple) as I get one in the previous crossing (cow x blue). This comes as a surprise to me, since the blue and purple color are closely related. I expected to see a kirin-like coloration in this project, but it does not happen. I am still curious though about what will happen if I cross these offspring back to a purple ranchu.

These are the parent fishes:

Male parent
female parent

And the offspring are:

I already cull out the fishes from these two projects. Those with weak body shape are eliminated (I give them freely to friends). So, the next update will not contain all of the fishes portrayed here.



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